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General anatomy of Anodontia (Anodontia) alba with left valve, mantle and ctenidium removed. Florida Keys, USA. L 35 mm. Abbreviations: aa-anterior adductor muscle; apt-posterior apertures; bw-body wall; f-foot; h-heel of foot; k-kidney; lp-labial palps; pa-posterior adductor muscle; pbv-pallial blood vessel; peperiostracum; s-septum.
Source publication
Marine bivalves of the family Lucinidae possess a likely obligate chemosymbiosis with sulphide-oxidising bacteria from which they derive much of their nutrition. Molecular analysis has shown that species of the ‘Anodontia’ group form a distinct clade within the monophyletic Lucinidae. Species identification of the largely tropical ‘Anodontia’ group...
Contexts in source publication
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... phenax Dall, 1901, p. 803 and 823, pl. 40, fig. 3. Dall & Simpson, 1901, 492. Lucina (Lucina) phenax -Warmke & Abbott, 1961, p. 176. Anodontia phenax -Britton, 1970. Anodontia (Anodontia) phenax (Dall & Simpson, 1901) - Bretsky, 1976, p. ...
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... medium-sized, H to 30 mm, L to 34 mm, sub- circular, longer than high (H/L 0.9). Posterior dorsal margin straight, moderately inflated (T/L 0.28). Periostracum thin, buff. External sculpture of fine commarginal growth in- crements, crossed by a few radial striations. Lunule short, heart-shaped, deeply impressed into hinge line, extending un- der umbones (Fig. 35I). Hinge plate thin, edentulous. Ligament internal, shallowly inset. Anterior adductor muscle scar long, narrow, detached from pallial line at an angle of about 35 • for 70% of length. Posterior adductor scar tear-drop shaped. Pallial line discontinuous, divided into small, rounded blocks (Fig. 12B). Shell inside pallial line with radial grooves and low ridges. Shell margin outside pallial line with fine ridges and ...
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... and Godfrey (1938) separated this species from the eastern Australian, A. (Cavatidens) omissa (Iredale, 1930), on the basis of the larger and longer shell. Additionally, A. (E.) perplexa has a shorter, wider and less detached anterior adductor muscle scar (Fig. 12A). The two species have a dis- junct distribution (Fig. 34), with A. (C.) omissa distributed from New South Wales to southern Queensland and A. (E.) perplexa ranging from South Australia to Shark Bay. On shell characters we consider that A. (E.) perplexa is more closely similar to A. (E.) ovum than to A. (C.) omissa and this con- clusion is corroborated by a single 18S gene sequence ob- tained for A. (C.) perplexa from Victor Harbor, South Australia (Fig. ...
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... ranging throughout the IWP from the northern Red Sea, and northern Indian Ocean to Tonga in the Pacific (Fig. ...
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... (Cryptophysema) trulla may be an Australian en- demic species ranging around the north coast, from Shark Bay, Western Australia to Moreton Bay, Queensland (Fig. ...
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... and mantle gills. A probable apomorphy of Anodontia is the pallial septum that partially divides the mantle cavity. This is present in all species examined and consists of a nar- row fold of mantle that extends posteriorly from the ventral termination of the anterior adductor muscle, gradually decreas- ing in height towards the posterior ventral margin. In larger species (A. philippiana), the anterior part of the septum is highly pleated into digitiform mantle gills (Figs 4,7). Smaller Anodontia species (A. bullula, A. omissa) have much less an- terior folding of the septum (Fig. 6). Internally, the septal folds consist of extensive blood spaces and are thought to function as respiratory surfaces (Taylor & Glover, 2000). In Anodontia alba, the septum is less well developed and consists of a low ridge, extending from the ventral tip of the anterior adductor to the posterior margin; plicate mantle gills are absent (Fig. ...
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... hawaiensis Dall, Bartsch and Rehder, 1938, (Fig. 30 G). Lunule small, heart- shaped. Ligament internal, set in shallow groove. Hinge line narrow, edentulous. Juvenile shells less than 5 mm sometimes with projecting fold on hinge plate. Anterior adductor muscle scar relatively short, detached from the pallial line at an angle of about 36 • for about 55% of its length. Anterior muscle scar often lobate along dorsal edge and divided transversely into irregular blocks or islands (Fig. 31). Posterior adductor scar tear-drop shaped. Pallial line entire, frequently irregu- larly broader ventral to anterior adductor scar (Fig. 31). Shell surface within the pallial line dull, often with radial grooves and circular mantle attachment sites. Pallial blood vessel scar usually visible. Shell margin glossy, with fine radial ridges. ...
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... Most Anodontia species are uniformly white, grey white or cream. The western Atlantic A. alba is usually col- oured yellow or apricot within the pallial line. Anodontia perpl- exa is often pale pink or yellow internally and some specimens of A. ovum also have a pale yellow interior. Anodontia aurora from Guam has rose-pink or yellow rays radiating from the umbone (Fig. 44), while A. fragilis and A. subfragilis often have shells with pink umbones. The juvenile shells of A. ovum and A. hawaiensis are frequently pale yellow and mottled with translucent flecks (Fig. ...
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... the Latin insulosus meaning full of islands; an allusion to the pallial line divided into many separated points of attach- ment. Umbones prominent. Lunule short, lanceolate, symmetrical and deeply impressed with conspicuous, deeply-scooped ap- pearance on inside of valve (Fig. 37F). Hinge plate very thin, curved, edentulous. Ligament internal, inset laterally. Anterior adductor muscle scar medium length, detached from pallial line for about 70% of length, at an angle of approximately 40 • . Tracks of adductor muscle scars often visible on shell in- terior. Posterior adductor scar short, tear-drop shaped. Interior of shell dull, sometimes with radial striations. Pallial line dis- continuous, with irregular elongate attachment sites separated by narrow gaps (Fig. 12B). Shell margin outside pallial line often with radial ...
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... have studied a large sample of this species from Mauritius (NMW, Viader collection), including juveniles that are less anteriorly extended and less inflated than the adult. The holo- type of Lucina ovulum Reeve, from Mauritius, is a small, thin-shelled specimen (Figs 39 A-B), lacking the anteriorly extended shell margin. However, it closely matches the juven- ile shells studied, with radial striations on the outer surface of the shell, similar ligament form, internal radial ridges and a discontinuous pallial line. A. (Cryptophysema) ovulum is the most inflated of the Anodontia species and is similar in shell shape to A. (A.) eu- tornus and A. (P.) kora, but it is smaller then either of these species and has a discontinuous pallial line. It differs from the other A. (Cryptophysema) species, A. insulosa and A. trulla in the absence of a deeply impressed lunule and in shell shape. A. (Euanodontia) ovum is also a common species around Mauritius, but differs from A. (C.) ovulum in being circular in shape, less inflated, with a distinct lunule and a continuous pallial ...
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... trulla, A. insulosa and A. ovulum. with commarginal growth increments and halts. Dorsal areas not defined. Umbones small. Lunule narrow, lanceolate, im- pressed, slightly scooped. Hinge short, thin, curved, edentu- lous. Ligament internal, slightly inset. Anterior adductor scar medium length, relatively straight, detached from pallial line for about 67% of length, at an angle of about 26 • . Tracks of adductor muscle scars often visible on the shell interior (Fig. 35B). Posterior adductor scar short, tear-drop ...
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... Usually the lunule is inconspicuous, lanceolate to heart-shaped and only in a few species is it a distinctive charac- ter. Both Anodontia trulla and A. insulosa have deeply scooped lunules ( Figs 35I, 37F) while Anodontia alba and A. eden- tuloides have lunules that are long, lanceolate and strongly asymmetric, with the right valve protruding into the left (Fig. ...
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... species have many features in common with other described lucinids (Allen, 1958, Narchi & Farini Assis, 1980Frenkiel & Mouëza, 1995;Frenkiel et al., 1996;Taylor & Glover, 1997aGros et al., 2003). The ctenidia are made up of single, homorhabdic, thickened inner demibranchs only; the labial palps are small folds at the edge of the lips (Figs 3, 4) and the foot is narrow and cylindrical, with a slightly broader, ciliated and glandular tip. The gill filaments are differentiated into ciliated, intermediate and thick bacteriocyte zones, with the middle part of the filaments arranged into cylindrical tubes lined with bacteriocytes ( Fig. 5A,B). The bacteriocytes contain abundant symbiotic bacteria (Fig. 5), that are usually elongate in most species examined (A. alba, bullula, omissa, ovum, philippiana, ...
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Macrobenthic mollusks are considered a good aquatic bioindicator for environmental biomonitoring. This study was conducted in Tembelas Island, Karimun District, Kepulauan Riau Province, at 103°29'47' - 103°29'90' BT and 0.991°16'63' - 0.989°06'37' LS. The objective was to compare the quality of water and sediment at Integrated Multitrophic Aquacult...
Citations
... In the last two decades, up to 28 new genera and 93 new species were reported from IWP (Jiao and Zhang 2022). Among the new species, 47 are collected from the deep sea (Taylor and Glover 2002, 2005, 2021Glover et al. 2003Bouchet and Cosel 2004;Glover and Taylor 2007Cosel and Bouchet 2008;Okutani 2011). Bafflingly, despite the great diversity of deep-sea lucinids in the Okinawa Trough and the region south of the Philippines in IWP, there are few reports of lucinids in the deep sea of the South China Sea, which represents a substantial part of IWP. ...
The increasing discoveries of new species of the family Lucinidae in the last two decades indicated a surprising diversity of chemosynthetic lucinids in the deep sea, especially in the Indo-West Pacific. However, only a few records have been reported from the South China Sea. A new lucinid species Elliptiolucina subovalis sp. nov. is here reported from a deep-sea cold seep site of the South China Sea. The new species is distinct from its congeners by possessing a strong anterior lateral tooth on the right valve and anterior tapering, subrectangular-oval shells. Sequences of three genes (18S rRNA, 28S rRNA, and CytB) were used to analyze its relationships with other species in the subfamily Myrteinae and confirm its taxonomic placement. The result supports the monophyly of Myrteinae but also demonstrates the polyphyly of Elliptiolucina . The new species has a close relationship with E. williamsae and Rostrilucina garuda , but is not closely related to congener E. ingens . By comparing morphological characters, we suggest that E. ingens should not belong to the genus Elliptiolucina . The basal two of three deep-sea clades recognized in Myrteinae may indicate the deep-sea origin of this subfamily. Our results add to the known diversity of deep-sea lucinids and molecular information for poorly studied Myrteinae and highlight the necessity of further investigation on deep-sea lucinids of the South China Sea.
... Despite a superficial resemblance, Cryptophysema vesicula is distantly separated on long branches from Euanodontia ovum. Pegophysema is paraphyletic but sequence data for the type species, Pegophysema schrammi (Crosse, 1876), from the western Atlantic are needed and Pegophysema bialata was only tentatively included in the genus by Taylor & Glover (2005) . Unusually for lucinids in general, the molecular results support most of the generic assignments made using shell characters proposed by Taylor & Glover (2005) , with genera distinguished by characters of the ligament, lunule, anterior adductor scar, pallial line and secondary pallial attachment scars. ...
... Pegophysema is paraphyletic but sequence data for the type species, Pegophysema schrammi (Crosse, 1876), from the western Atlantic are needed and Pegophysema bialata was only tentatively included in the genus by Taylor & Glover (2005) . Unusually for lucinids in general, the molecular results support most of the generic assignments made using shell characters proposed by Taylor & Glover (2005) , with genera distinguished by characters of the ligament, lunule, anterior adductor scar, pallial line and secondary pallial attachment scars. Despite the long branches, the earliest fossils that can be assigned to the Pegophyseminae date from the early Eocene of the Paris Basin and southern USA ( Cossmann & Pissarro, 1904-1906Gardner, 1951 ). ...
... Pegophysema species are present in the IWP and Red Sea ( Pegophysema philippiana , Pegophysema kora Taylor & Glover, 2005 and Pegophysema bialata (Pilsbry, 1895)), western Atlantic ( Pegophysema schrammi Crosse, 1876) and eastern Pacific ( Pegophysema blanquita Taylor & Glover, 2005 ) but absent from the Mediterranean and eastern Atlantic. However, fossil lucinids similar to Pegophysema ( Lucina globulosa Deshayes, 1830) are recorded from the Miocene of the Aquitaine Basin, France ( Cossmann & Peyrot, 1912 ) and late Pliocene hydrocarbon seeps of Italy ( Kiel & Taviani, 2018 ). ...
New molecular phylogenies of the chemosymbiotic bivalve family Lucinidae, using 18S rRNA, 28S rRNA and cytochrome b genes, include species from genera not previously analysed. Notable additions from Myrteinae are sequences from Rostrilucina, Solelucina and Taylorina species, species of Ustalucina, Gonimyrtea from Leucosphaerinae and additional species of Ctena, Codakia, Lucinoma and Divalucina from Codakiinae. New sequences of Lucininae include the type species of Parvilucina (P. tenuisculpta), Liralucina, Falsolucinoma, Easmithia, Jallenia, Radiolucina and Cardiolucina as well as samples of Loripes orbiculatus from multiple localities. Five major clades, defined as subfamilies, are recognized: Pegophyseminae, Myrteinae, Leucosphaerinae, Codakiinae and Lucininae. Two branches, Fimbriinae and Monitilorinae, are represented by single species. Pegophyseminae are an extremely long-branched group with a sister-group relationship to Leucosphaerinae, while Codakiinae are a sister clade to the Lucininae. In various gene trees, the position of Myrteinae is unstable in relation to Pegophyseminae + Leucosphaerinae, Monitilorinae and Fimbriinae. The Myrteinae are not well resolved, with an ambiguous correlation of molecular and morphological characters. Codakiinae now include Divalucina cumingi, shown to be related to Lucinoma rather than Divaricella and Divalinga of the Lucininae. Leucosphaerinae are a well-supported clade but morphologically disparate, with the positions of Gonimyrtea and Callucina unresolved. Several molecularly distinct subclades are recognized within the Lucininae, especially the Lucinisca, Loripes and Parvilucina groups. Parvilucina species are paraphyletic with P. tenuisculpta, the type species, distinct from the western Atlantic species. Codakia, Ctena and Pegophysema have pan-tropical distributions with former connections disrupted by vicariant events of the closure of the eastern Tethyan and Central American Seaways. Species of Radiolucina, Pleurolucina and Lucinisca are present on either side of the Isthmus of Panama. A new classification of the 96 living lucinid genera is presented, providing a framework for future studies of systematics, ecology, biogeography and bacterial symbioses.
... These mangrove clam species accommodate bacterial symbionts that utilize sulfides for their nourishment. It is very common to have an existing mangrove clam species in a mangrove ecosystem, since this habitat provides plenty of sulfides because of its oxygen deficient environment, necessary for the survival of bacterial symbionts that live in the gills of the mangrove clams (Taylor et al 2010;Lumogdang et al 2022). ...
Mangrove clams Anodontia philippiana, locally known as imbao, are predominantly found in mangrove ecosystems in the Philippines. Nowadays, these are declining due to habitat disturbances and unregulated harvest. This study was conducted in Baganga, Davao Oriental, with lush mangrove forest in its coastline. Four study sites were identified based on local interviews and with the assistance of the municipal agriculturist, namely barangay Kinablangan, Lucod, Salingcomot and Bobonao. A 1x1 m transect quadrat method was employed during sampling. Density, length and weight of mangrove clams, as well as the physico-chemical parameters were determined. Analysis of variance, Tukeys test and linear regression were used during analysis. Mangrove clams with a higher density were found in Kinablangan, the size ranging from 3.5-4.4 cm in barangay Kinablangan, Lucod and Salingcomot, while Bobonao had clams with a size range between 4.5-5.4 cm. Lighter mangrove clams were found in Kinablangan (10-19.9 g). In Lucod and Salingcomot clams were heavier (20-29.9 g) and Bobonao clams were the heaviest (30-39.9 g). Mature mangrove clams dominated the catch in all study sites. The study revealed no significant differences in the density among stations. However, significant differences were noted for the length and weight of mangrove clams among stations and a positive relationship between length and weight. No presence of overexploitation was perceived, but indiscriminate harvest was observed. It is essential to implement mangrove clam conservation and harvest strategy to sustain the mangrove clam population in the mangrove areas of Baganga, Davao Oriental, Philippines.
... The main shell features include very large (typically > 100 mm) and very inflated shells lacking sculpture except for rough growth increments, a narrow and edentulous hinge plate, a long and thin ligament nymph, and a broad, more-or-less straight anterior adductor muscle scar that is widely detached from the pallial line and extends for about 2/3 of the shell height toward the ventral shell margin (Bouchet and Cosel 2004). Members of the Anodontia clade differ by being smaller and by having a shorter and/or narrower anterior adductor muscle scar (Taylor and Glover 2005). 15. ...
Bivalves are an important part of the methane seep fauna ever since seeps appeared in the geologic record. The chronostratigraphic ranges of seep-inhabiting chemosymbiotic bivalves show an overall increase in diversity at seeps since the Paleozoic. The most common group at Paleozoic and early Mesozoic seeps are modiomorphids, with a few additional records of solemyids and anomalodesmatans. The most common infaunal chemosymbiotic bivalve taxa at modern seeps, lucinids and thyasirids, appeared at seeps in the Late Jurassic and earliest Cretaceous. They diversified during the Cretaceous synchronous with the peak of the “Mesozoic Marine Revolution” and first occurrences of gastropod predatory drill holes in the shells of seep-inhabiting bivalves, soon after the appearance of these gastropods in the mid-Cretaceous. The two dominant bivalve clades of the modern vent and seep fauna, bathymodiolins and vesicomyids, appeared in the Eocene. Their origin has been linked to a deep-water extinction event at the Paleocene-Eocene Thermal Maximum. However, the fossil record of chemosymbiotic bivalves at seeps during this time interval does not display any extinction. Rather, the mid-Eocene appearance of semi-infaunal and epifaunal bivalves such as bathymodiolins and vesicomyids might be linked to a dramatic rise in seawater sulfate concentrations at this time.KeywordsBivalvesChemosymbiosisEvolutionSulfate concentrationMesozoic marine revolutionSolemyidaeNucinellidaeBathymodiolinaeModiomorphidaeKalenteridaeLucinidaeThyasiridaeVesicomyidaeAnomalodesmatas
... These mangrove clam species accommodate bacterial symbionts that utilize sulfides for their nourishment. It is very common to have an existing mangrove clam species in a mangrove ecosystem, since this habitat provides plenty of sulfides because of its oxygen deficient environment, necessary for the survival of bacterial symbionts that live in the gills of the mangrove clams (Taylor et al 2010;Lumogdang et al 2022). ...
Mangrove clams Anodontia philippiana, locally known as imbao, are predominantly found in mangrove ecosystems in the Philippines. Nowadays, these are declining due to habitat disturbances and unregulated harvest. This study was conducted in Baganga, Davao Oriental, with lush mangrove forest in its coastline. Four study sites were identified based on local interviews and with the assistance of the municipal agriculturist, namely barangay Kinablangan, Lucod, Salingcomot and Bobonao. A 1x1 m transect quadrat method was employed during sampling. Density, length and weight of mangrove clams, as well as the physico-chemical parameters were determined. Analysis of variance, Tukeys test and linear regression were used during analysis. Mangrove clams with a higher density were found in Kinablangan, the size ranging from 3.5-4.4 cm in barangay Kinablangan, Lucod and Salingcomot, while Bobonao had clams with a size range between 4.5-5.4 cm. Lighter mangrove clams were found in Kinablangan (10-19.9 g). In Lucod and Salingcomot clams were heavier (20-29.9 g) and Bobonao clams were the heaviest (30-39.9 g). Mature mangrove clams dominated the catch in all study sites. The study revealed no significant differences in the density among stations. However, significant differences were noted for the length and weight of mangrove clams among stations and a positive relationship between length and weight. No presence of overexploitation was perceived, but indiscriminate harvest was observed. It is essential to implement mangrove clam conservation and harvest strategy to sustain the mangrove clam population in the mangrove areas of Baganga, Davao Oriental, Philippines.
... Subfamily Leucosphaerinae Taylor et Glover, 2011 Genus Leucosphaera Taylor et Glover, 2005 112. Leucosphaera oyamai (Habe, 1962) Local distribution as Leptaxinus oyamai) (Shinyang, Sagyei). ...
... Leptaxinus oyamai Habe, 1962 in Thyasiridae, and known for a long time in regional literature as such Okutani, 2000;Lee J.-S., 2016) was recently assigned to Leucosphaera Taylor et Glover, 2005Glover and Taylor, 2016), the type genus of the Leucosphaerinae Taylor et Glover, 2011, (no radial shell sculpture, cardinal teeth usually small or absent, lateral teeth lacking, whereas the lunule is prominent and highly asymmetrical; "a distinct, well-supported clade in the molecular analysis, but there are no clear and consistent morphological characters that unite the group": Taylor et al., 2011, p. 28). Shells of Leucosphaera have usually been identified in museum collections as juvenile "Anodontia Link, 1807" but they can be separated by the ovoid shape, the regularly-spaced, fine, commarginal lamellae, the presence of the tooth-like central knob with anterior flange in the hinge, and the extremely short, slightly-detached, anterior adductor muscle scar (Taylor and Glover, 2005;Glover and Taylor, 2007;. Illustration in Min D.-K. ...
The second part of the annotated and illustrated catalogue of species of the bivalve molluscan fauna of Jeju Island (Jeju-do) is based on original and literature data. The catalogue provides local distribution and taxonomic comments on bivalves and is supplemented with data on general distribution, habitats, and primary synonyms.
This part includes 142 species belonging to 36 families (Lucinidae through Poromyidae), with original photographs for 76 species. Nineteen species are reported as new for Jeju Island, 9 species as new for Korea: Vasticardium subrugosum (G.B. Sowerby II, 1839), Fragum loochooanum Kira, 1959, Montacutona japonica (Yokoyama, 1922), Pristipagia ojiensis (Tokunaga, 1906), Donax cuneatus L., 1758, Sunetta kirai Huber, 2010, Pitar inflatus (G.B. Sowerby II, 1851), Dosinia cf. orbiculata Dunker, 1877, Pelecyora corculum (Römer, 1870), and 6 species have been reported in literature but were not included in the first molluscan catalogue of Jeju by Noseworthy et al. (2007); in total, 25 species are added to the Jeju fauna in this part. Odd literature records are discussed. In all, 248
species and 58 families of marine bivalve mollusks are currently known in Jeju-do.
... No external features are preserved. This species is very similar to the extant Caribbean type species Anodontia alba and the extant A. edentuloides (Verrill) from the Gulf of California (Taylor and Glover, 2005) except for its rather weak inflation, which is unusual for Anodontia. This species may represent a new taxon for Cuba, but we refrain from describing it until better specimen are available. ...
... The abundance of the lucinid bivalve Anodontia (s.l.) suggests that these deposits may be interpreted as an ancient seagrass meadow. Anodontia species are often associated with seagrass beds (Taylor and Glover, 2005). For example, the extant A. alba, which resembles the Aguacate specimens regarding pallial line and adductor scar characters, was reported in very large numbers from a seagrass meadow in Biscayne Bay, Florida (Moore et al., 1968) and other places in the Caribbean regions (Jackson, 1973). ...
Here is reported fauna from a Middle Miocene limestone deposit of the Cojímar Formation near the town of Aguacate in the Province of Mayabeque, western Cuba. The fossils are preserved only as internal or external molds, but we identified members of at least eight bivalves and six gastropod families and one solitary coral. The most common taxon is a lucinid bivalve probably belonging to the genus Anodontia, which may likely represent a new taxon. This species in particular, and the fauna and facies in general, suggest that the Aguacate limestone may represent an ancient seagrass meadow environment. The fauna of the Aguacate quarry shows biogeographic relationships mainly to the Miocene of Panama and Florida, but also some links to the subtropical Atlantic coast of North America, and the Miocene of northern Ecuador. Anodontia, Bivalvia, Caribbean sea. Aquí se registra la fauna presente en un depósito de calizas del Mioceno Medio de la Formación Cojímar que afloran cerca del pueblo de Aguacate, en la provincia de Mayabeque, occidente de Cuba. Los fósiles se conservan solo como moldes internos o externos, pero identificamos miembros de al menos ocho familias de bivalvos y seis de gasterópodos, y un coral solitario. El taxón más común es un bivalvo lucínido que probablemente pertenezca al género Anodontia, y que pudiera representar un nuevo taxón para la ciencia. Esta especie en particular, y la fauna en general, sugieren que la caliza Aguacate puede representar un antiguo ambiente de pradera de pastos marinos. La fauna de la cantera de Aguacate muestra relaciones biogeográficas principalmente con el Mioceno de Panamá y Florida, pero también algunos vínculos con la costa atlántica subtropical de América del Norte y con el Mioceno del norte de Ecuador.
... Cryptic diversity represents instances which species are, at least morphologically, indistinguishable (Bickford et al., 2007), but it may underestimate the complexity of biodiversity. While the presence of cryptic species poses challenges for biodiversity assessment, approaches incorporating genetic information into evolutionary significant lineages identification, including cryptic species, as well as genetic diversity and divergence estimation have been proven to be essential and expanded to most metazoan taxa, including insects (Nunes et al., 2014), amphibians (Vacher et al., 2017), birds (Lohman et al., 2010), reptiles (Vasconcelos et al., 2016), molluscs (Liu et al., 2011;Taylor & Glover, 2005), and fishes (Hubert et al., 2012;Shen et al., 2011). ...
Aim
Sillaginidae is commercially exploited fish species across the Indo‐West Pacific (IWP), and changes in its abundance are of major conservation concern. Cryptic species in the marine realm emphasizes the necessity to revise our current perception of marine biodiversity, and understanding cryptic diversity is a prerequisite for sustainable development of ocean fisheries. Therefore, our goal was to provide an in‐depth understanding of cryptic diversity and evolutionary diversification of the family Sillaginidae across the IWP to assess the currently uncertain global status of the species.
Location
IWP shores spanning from Japan and Australia to South Africa.
Methods
Samples from 23 valid and two undefined Sillaginidae species were obtained across their habitats in IWP. Phylogenetic analyses and molecular dating of both mitochondrial (12S, 16S, Cyt b, and COI) and nucleic (RAG2) loci, combined with morphometrics of the swim bladder, were used to evaluate their cryptic species diversity and phylogeography.
Results
A total of 31 operational taxonomic units with two highly diverse cryptic complexes in Sillago ingenuua and Sillago sihama were identified across IWP, including a shallow dichotomous branch in the S. ingenuua complex and eight highly divergent clades from the S. sihama complex. The robust model‐based multigene phylogeny for 24 Sillaginidae species was well supported in accordance with the morphology evolution of swim bladder. The origin of the Sillaginidae was estimated during the Middle Eocene based on the relaxed molecular clock analysis calibrated by fossil and paleogeographic event.
Main conclusions
Our results indicated that more cryptic species could be present in the family Sillaginidae and a thorough reappraisal of the current S. sihama taxonomy is warranted. The swim bladder evolution in Sillaginidae fishes was from simplicity to complex corresponding with phylogeny. Given the complex cryptic diversity of Sillaginidae species, we suggested treating them as different management units in utilization of offshore fisheries resources.
... Distribution. From East Africa to New Caledonia (Taylor and Glover 2005). Ecological notes. ...
The diversity of bivalves was studied in four mangrove stands in the vicinity of Nha Trang city: planted mangroves in Dâm Bay (Tre Island) and three natural associations, in Dâm Bay, Nha Phu Bay and Cam Ranh Bay. Forty-five species from 18 families of bivalve molluscs were recorded in total. The richest families were Veneridae (eight species), Tellinidae (six species) and Lucinidae (five species). Five of the species are considered to be true mangrove associates, while others are eurybiotic species normally inhabiting mudflats and hard intertidal substrata, although some of them are commonly found in mangroves. An illustrated guide is provided, with short synonymies and data on ecology and distribution. The recorded molluscan diversity is compared with published data on mangrove Bivalvia in different regions of the Indo-Pacific. Since all characteristic groups and mangrove associates were present in our samples (except wood-borers that were not sampled), species composition of studied mangrove stands in Vietnam fits the general pattern of Indo-Pacific mangrove bivalve fauna.
... Rhacothyas spitzbergensis clearly does not belong in Anodontia, which has a globular shell with short, weakly sloping anterodorsal and posterodorsal margins, and a curved ventral margin forming a deep arch continuous with anterior and posterior margins. In contrast, the Spitsbergen species has relatively long, sloping anterodorsal and posterodorsal margins, and a ventral margin forming a relatively shallow arch unlike that known from extant Anodontia species (Taylor and Glover 2005). There is no reported occurrence of Anodontia older than the Miocene (e.g., Ludbrook 1959Ludbrook , 1978Olsson 1964;Kiel et al. 2018). ...
We present a systematic study of late Paleocene macrofauna from methane seep carbonates and associated driftwood in the shallow marine Basilika Formation, Spitsbergen, Svalbard. The fauna is composed of 22 taxa, comprising one brachiopod, 14 bivalves, three gastropods, three crustaceans, and one bony fish. The reported fish remains are among the first vertebrate body fossils from the Paleogene of Spitsbergen. One genus is new: the munidid decapod Valamunida Klompmaker and Robins gen. nov. Four new species are described: the terebratulide brachiopod Neoliothyrina nakremi Bitner sp. nov., the protobranch bivalve Yoldiella spitsbergensis Amano sp. nov., the xylophagain bivalve Xylophagella littlei Hryniewicz sp. nov., and the munidid decapod Valamunida haeggi Klompmaker and Robins gen. et sp. nov. New combinations are provided for the mytilid bivalve Inoperna plenicostata, the thyasirid bivalve Rhacothyas spitzbergensis, the ampullinid gastropod Globularia isfjordensis, and the munidid decapod Protomunida spitzbergica. Thirteen taxa are left in open nomenclature. The fauna contains a few last occurrences of Cretaceous survivors into the Paleocene, as well as first occurrences of Cenozoic taxa. It is composed of chemosymbiotic thyasirid bivalves and background species common in the northern Atlantic and Arctic during the Paleocene. Our results provide no evidence for a Paleocene origin of vesicomyid and bathymodiolin bivalves typical for Eocene and younger seep environments; instead, the Paleocene seeps of the Basilika Formation are more similar to their Late Cretaceous equivalents rich in thyasirids.
