FIGURE 6 - uploaded by Marina R. Cunha
Content may be subject to copyright.
Source publication
Faunal collections from mud-volcano sites in the Gulf of Cadiz, at depths between 355 and 3061 m, have revealed a high diversity (and in some cases high density) of tanaidaceans. A previous paper has described some of the tanaidomorph species found. Records of apseudomorph species from deep-sea chemosynthetic habitats are almost non-existent. The p...
Contexts in source publication
Context 1
... the present records add nothing new. Records of A. grossimanus from off South Africa and in the Mediterranean (see Sieg 1983) must be regarded with some suspi- cion. Neither this species nor A. setiferus (see above) shows any particular morphological adaptation to the condi- tions found at chemosynthetic habitats. Description of male. Body ( Fig. 6B), dorsoventrally flattened, elongate, 4.7 mm long, 6.5 times as long as wide, narrower posteriorly. Cephalothorax subrectangular, 1.2 times as long as wide, anterior margin with conspic- uous pointed rostrum with slight "shoulders" at base. Eyes absent; eyelobes modified to prominent, curved spine- like apophyses directed ...
Context 2
... of female (Fig. 6A, 9). Generally as male, but pleopods absent. Cheliped merus with spine-like apophysis on "shoulder"; fingers of chela without tooth-like apophyses. Pereopod 1 (Fig. 9B) stouter, basis (for example) 3.4 times as long as ...
Context 3
... of male. Generally as female. Antennule (Fig. 16A) peduncle of four distinct articles, first article more attenuate than that of female, 6.2 times as long as wide, third and fourth articles distinctly articulated, sub- equal in length; flagellum with single aesthetascs on each of four proximal segments. Antenna (Fig. 16B) with two- segmented flagellum. Cheliped (Fig. 16C) dimorphic, ...
Context 4
... of male. Generally as female. Antennule (Fig. 16A) peduncle of four distinct articles, first article more attenuate than that of female, 6.2 times as long as wide, third and fourth articles distinctly articulated, sub- equal in length; flagellum with single aesthetascs on each of four proximal segments. Antenna (Fig. 16B) with two- segmented flagellum. Cheliped (Fig. 16C) dimorphic, proportionately larger than that of female; carpus curved, distal on merus, with ventral proximal apophysis, three ventral marginal setae; propodus not overhanging carpus proximally, chela forcipate, fixed finger with squared distal tip bearing six inner setae; gap between ...
Context 5
... as female. Antennule (Fig. 16A) peduncle of four distinct articles, first article more attenuate than that of female, 6.2 times as long as wide, third and fourth articles distinctly articulated, sub- equal in length; flagellum with single aesthetascs on each of four proximal segments. Antenna (Fig. 16B) with two- segmented flagellum. Cheliped (Fig. 16C) dimorphic, proportionately larger than that of female; carpus curved, distal on merus, with ventral proximal apophysis, three ventral marginal setae; propodus not overhanging carpus proximally, chela forcipate, fixed finger with squared distal tip bearing six inner setae; gap between fingers with setulose rounded apophysis and tuft of ...
Context 6
... ventral proximal apophysis, three ventral marginal setae; propodus not overhanging carpus proximally, chela forcipate, fixed finger with squared distal tip bearing six inner setae; gap between fingers with setulose rounded apophysis and tuft of four setae; dactylus with four rounded apophyses along cutting edge, three distal setae. Pereopod 1 (Fig. 16D) proportionately longer and more slender than that of female, carpus only sparsely setose dorsally, ventral propodal spines more slender; dactylus and unguis more slender, together just lon- ger than propodus. Other pereopods (e.g. Fig. 16E) more slender than those of female, dactyli and ungues propor- tionately ...
Context 7
... of four setae; dactylus with four rounded apophyses along cutting edge, three distal setae. Pereopod 1 (Fig. 16D) proportionately longer and more slender than that of female, carpus only sparsely setose dorsally, ventral propodal spines more slender; dactylus and unguis more slender, together just lon- ger than propodus. Other pereopods (e.g. Fig. 16E) more slender than those of female, dactyli and ungues propor- tionately ...
Similar publications
New species of the genera Diastylis, Divacuma and Leptostylis are described. Also a new species of the genus Pseudoleptostyloides, known from the Atlantic, is described for the NW Pacific. Additional information is given on Leptostyloides quadridentata.
Citations
... The knowledge of the deep-sea Tanaidacea along the Portuguese margin is scarce: except for the Gulf of Cadiz and Horseshoe Continental Rise, where tanaidacean fauna have been the subject of taxonomic studies (Błażewicz-Paszkowycz et al. 2011a, 2011bEsquete & Cunha 2017, few published works (Norman & Stebbing 1886;Stephensen 1915;Băcescu 1978) and repository datasets (IFREMER 2020; Orrel 2020) have added localized records to the area. In 2006, two research cruises were carried out aiming at a multidisciplinary study of three of the largest marine canyons from the Portuguese margin: Nazaré, Cascais and Setúbal (Fig. 1). ...
... European Journal of Taxonomy 740: 55-76(2021) ...
The Tanaidacea are ubiquitous and amongst the most abundant taxa in the deep sea. However, their diversity in submarine canyons remains largely unknown. Here, two new species and a new genus of Paratanaoidea are described. Paranarthrura cousteaui sp. nov. is distinguished by the combination of the following characters: post-cheliped sclerites not fused, presence of one seta in the maxilliped endite, one long midventral seta in cheliped, one penicillate seta in the basis of pereopods 4-6, uropod endopod bi-articulated and uropod exopod shorter than endopod article 1. This species was found at the upper reaches of three Portuguese canyons, Cascais, Setúbal and Nazaré Canyons, and the adjacent open slope, between 897 and 1001 m water depths. Tirana vallis gen. et sp. nov. presents a combination of the characters that defi ne the other two genera of Paranarthrurellidae, Paranarthrurella and Armatognathia, but also unique characters within the family: the antenna, cheliped and uropod are more elongate than the rest of the species; the pereopods 4-6 carpus spines reach at least half of the length of the propodus and the propodus of pereopods 4-6 have ramifi ed subdistal spines. This species was found at the middle reaches of Setúbal Canyon (3214-3219 m water depth).
... The tanaidomorphan crustaceans from the mud volcanoes of the Gulf of Cadiz (GoC) were first studied by Błażewicz-Paszkowycz et al. (2011a); their work revealed a total of nine new species present in these chemosynthesis-based ecosystems, and later on the same authors reported seven species of apseudomorphans (Błażewicz-Paszkowycz et al. 2011b). Additional samples taken from the GoC mud volcanoes and extended to coral and carbonate mounds, and to the deep Horseshoe Continental Rise (HCR) field during further research cruises yielded additional tanaidacean material, including a new species of the Apseudomorpha (Esquete & Cunha 2017), and the new or little known species that are described below. ...
The Tanaidacea collection from various research cruises carried out in the Gulf of Cadiz and Horseshoe Continental Rise between 2004 and 2012 yielded four species new to science that are described herein. Two belong to genera recorded for the first time since the original descriptions of their type species: Cetiopyge, described from the Gulf of Mexico and Gam-boa from shallow waters of Macaronesia. The other two belong to the genera Collettea and Paragathotanais, both with a worldwide distribution. Additionally, specimens of Tumidochelia uncinata are described and illustrated to complete previous descriptions. Identification keys to all known genera of Nototanaidae, and the Eastern Atlantic species of Paragath-otanais and Collettea are provided. This works raises the number of tanaidacean species known from the deep-sea habitats in the study region to a total of 22.
... The apseudomorph tanaidaceans in the deep-sea remain largely under-studied, and in chemosynthetic habitats information about this group is very scarce: Larsen et al. (2006), in a paper focused on the tanaidaceans in the Lucky Strike hydrothermal vents, briefly mentioned the apseudomorphans, but only stated that the species found there were widely distributed in the Atlantic Ocean. The only detailed treatment of the group in a cold seep area was that of Błażewicz-Paszkowycz et al. (2011), who listed six species from the mud volcanoes of the Gulf of Cadiz. Since then, new research cruises have been carried out covering several previously unexplored areas, such as the Pen Duick Escarpment, and the deep Horseshoe Continental Rise ( Figure 1, Table 1). ...
... The type material was found at 1035-1080 m depths (Băcescu 1981), but no additional ecological information was provided. In the GoC Apseudes setiferus has a wide bathymetric distribution, between 350 and 2200 m depth (see also Błażewicz-Paszkowycz et al. 2011). It was found on coral mounds of the PDE and mud volcanoes of the El Arraiche field (Kidd, Meknès, Lazarillo de Tormes and Gemini) Carbonate Province (Ginsburg, Yuma) and Deep Field (Carlos Ribeiro). ...
... Băcescu, 1978 Atlantapseudes nigrichela Băcescu 1978: 317-322: fig. 1 Remarks. This species was described by Băcescu (1978) from off north of Portugal, and redescribed by Błażewicz-Paszkowycz et al. (2011), using material from the GoC. In the original description, Băcescu (op. ...
The apseudomorphan tanaidaceans of the deep sea have been under-studied, especially in chemosynthetic habitats. A total of ten species present in the Gulf of Cadiz and the Horseshoe Continental Rise (SW off the Iberian Peninsula) are listed here, and new distribution data, ecological remarks and description of one new species of Atlantapseudes (Atlantapseudes curvatus sp. nov.) from recent research cruises are added. Pseudosphyrapus azorensis and Francapseudes uniarticulatus are recorded for the first time since the original descriptions. Notes on morphological development of Leviapseudes segonzaci and intraspecific variation of F. uniarticulatus are included, together with illustrations and descriptions of the material from the Gulf of Cadiz to complement previous descriptions.
... In addition, five apseudomorphs collected from mud volcanoes in the Gulf of Cadiz have been recorded from elsewhere in the NE Atlantic. It is worth mentioning that the Gulf of Cadiz is the only locality where member of the family Apseudidae have been found associated with chemosynthetic habitats (Błażewicz-Paszkowycz et al. 2011a;Larsen 2006;Larsen et al. 2006). ...
Four undescribed species of Tanaidacea were discovered during a baseline monitoring program conducted off the coast of Ghana. The specimens came from a deep-water reef largely composed of the ahermatypic coral, Lophelia pertusa. The tanaidacean material was collected during November 2012 onboard the RV Dr Fridtjof Nansen using a van Veen grab indepths of between 375 and 386 m. Three of the new species described herein are tanaidomorphans belonging to the genera Bathyleptochelia (Leptocheliidae), Pseudotanais (Pseudotanaidae) and Cryptocopoides (Cryptocopidae). The fourth species, an apseudomorphan, belongs to Calozodion (Metapseudidae), a genus hitherto known only from shallow waters (<200 m). This report constitutes the first records of tanaidaceans from a deep-sea Lophelia reef.
... e absence of a mandibular palp is a diagnostic character of the subfamily Sphyrapodinae. Of the three previously-known genera, Sphyrapoides (only) has a squama on the antenna, while Sphyrapus Norman in Sars, 1882 has a reduced accessory agellum on the antennule, of one or fewer segments (see Błażewicz-Paszkowycz et al. 2011). [ " Sphyrapus " stebbingi Richardson, 1911 is tentatively reassigned here to Pseudosphyrapus: although the original description is scant, this species is not a Sphyrapus; Richardson (1911) did describe a two-segmented accessory agellum, and she made no mention of a squama on the antenna]. ...
Leptocheliid material from sublittoral sandy substrata in the South China Sea off the coast of Brunei has been analyzed. Four species, all new to science, are described, all apparently interstitial in habitat. One is the second species to be described in the genus Catenarius (C. magdae); the others represent three new genera, one in each of the subfamilies Konariinae (Brunarus colekanus), Catenariinae (Ektraleptochelia phoxops) and Leptocheliinae (Nuberis areolaticola). As a result of the new information on the morphology of catenariins, the Andaman Sea species Leptochelia elongata is transferred to a new genus (Larsmentia) in the Catenariinae.
... In addition, five apseudomorphs collected from mud volcanoes in the Gulf of Cadiz have been recorded from elsewhere in the NE Atlantic. It is worth mentioning that the Gulf of Cadiz is the only locality where member of the family Apseudidae have been found associated with chemosynthetic habitats (Błażewicz-Paszkowycz et al. 2011a;Larsen 2006;Larsen et al. 2006). ...
This paper presents the descriptions of two new genera and four new metapseudid species collected from the coral reefs of Ningaloo and Heron Island in north-western and eastern Australia, respectively. Two of the species, Curtipleon chadi n. sp., and Creefs heronum n. gen. n. sp. are members of the subfamily Synapseudinae, one, Msangia mussida n. sp. is a member of the subfamily Msangiinae and one Bamberus jinigudirus n. gen. n. sp. is a member of the subfamily Chondropodinae. With the exception of M mussida that was found on live coral, all of the species were associated with dead corals.
... 5K); this character is unknown in F. bicornis. Paszkowycz et al. (2011) redescribed F. retusifrons from near the type locality. Fageapseudes pluma and F. brachyomos differ from F. retusifrons, F. bicornis, and F. suprema in several characters (i.e., slight sexual dimorphism of chelipeds; pereopod 1 carpus longer than merus; pereopod 4 dactylus reduced) that may warrant splitting this genus into two genera, but this can only be determined after a detailed morphological examination and a phylogenetic analysis. ...
Examination of material housed at the Los Angeles County Museum of Natural History revealed a new species of Fageap-seudes from 4100 m depth off California, the first record of the genus in the eastern North Pacific. Fageapseudes pluma n. sp. is very similar to the Japanese species Fageapseudes brachyomos Bamber, but can be distinguished by differences in setation and by having fewer articles in the antennal flagellum and uropodal exopodite. It is unique for the genus and subfamily in having the inner caudo-distal seta of the maxillipedal endite "feather-like" instead of "leaf-like" or simply setulose. Problems with the current classification of the Apseudidae are briefly discussed, and new diagnoses are estab-lished for the subfamily Leviapseudinae and the genus Fageapseudes.
... e absence of a mandibular palp is a diagnostic character of the subfamily Sphyrapodinae. Of the three previously-known genera, Sphyrapoides (only) has a squama on the antenna, while Sphyrapus Norman in Sars, 1882 has a reduced accessory agellum on the antennule, of one or fewer segments (see Błażewicz-Paszkowycz et al. 2011). ["Sphyrapus" stebbingi Richardson, 1911 is tentatively reassigned here to Pseudosphyrapus: although the original description is scant, this species is not a Sphyrapus; Richardson (1911) did describe a two-segmented accessory agellum, and she made no mention of a squama on the antenna]. ...
... Tanaidacea may be considered an eurytopic group, recorded from almost any type of marine habitat: from hyperhaline lakes to hypohaline interstitial zones, saltmarshes and mangroves [5], [6], [7] and to the deepest abyssal habitats. They have been recorded in underwater caves [8], and at chemosynthetic habitats such as hydrothermal vents [9] mud volcanoes [10], [11] and sea-bed pock-marks [12]. Additionally, four species to date have been recorded from freshwater habitats [13]. ...
... Much smaller fractions of the described species are recorded on the Antarctic slope or abyssal (Amundsen Sea, Scotia, Ross and Weddell Sea) where they usually make up no more than 15% (Błaz_ewicz-Paszkowycz, unpubl.). In areas with some greater history of study, at least 26% of tanaidomorph species from the Gulf of Cadiz were found to be undescribed [11], four of 11 species from the Norwegian Margin were discovered to be new [12], and seven new tanaidomorph species were described out of 19 species from the North-east Atlantic margin [45], [46], [47], [48], the remaining known taxa being Table 2. Shallow-water zoogeographic areas analyzed, compared with MeoW provinces and regions [43]. ...
Tanaidaceans are small peracarid crustaceans which occur in all marine habitats, over the full range of depths, and rarely into fresh waters. Yet they have no obligate dispersive phase in their life-cycle. Populations are thus inevitably isolated, and allopatric speciation and high regional diversity are inevitable; cosmopolitan distributions are considered to be unlikely or non-existent. Options for passive dispersion are discussed. Tanaidaceans appear to have first evolved in shallow waters, the region of greatest diversification of the Apseudomorpha and some tanaidomorph families, while in deeper waters the apseudomorphs have subsequently evolved two or three distinct phyletic lines. The Neotanaidomorpha has evolved separately and diversified globally in deep waters, and the Tanaidomorpha has undergone the greatest evolution, diversification and adaptation, to the point where some of the deep-water taxa are recolonizing shallow waters. Analysis of their geographic distribution shows some level of regional isolation, but suffers from inclusion of polyphyletic taxa and a general lack of data, particularly for deep waters. It is concluded that the diversity of the tanaidomorphs in deeper waters and in certain ocean regions remains to be discovered; that the smaller taxa are largely understudied; and that numerous cryptic species remain to be distinguished. Thus the number of species currently recognized is likely to be an order of magnitude too low, and globally the Tanaidacea potentially rival the Amphipoda and Isopoda in diversity.
This paper reports the southernmost record of Camacho faroensis Myers, 1998 (Crustacea: Amphipoda: Aoridae) from samples collected at the continental slope (Ferrol Canyon) off the NW Iberian Peninsula during the DIVA-Artabria I expeditions. This species was initially described from the Faroe Islands but type specimens are incomplete and lack relevant features (e.g., antenna 1, pereopod 5). Therefore, a detailed redescription and drawings are provided based on examination of the type series and the new material collected. To date, the genus Camacho Stebbing, 1888 is composed of three species being C. faroensis as the only one reported so far from the Northern Hemisphere. This species is characterized by the following characters: absence of eyes, cephalic lobes reduced, presence of two ventral spines on peduncle article 1 distal margin of antenna 1, presence of spines (stout setae) on pereopods 5–7, reduced inner rami of uropod 3, and lacking distal setae. A key for all recognized species of the genus is also included.
Keywords: Crustacea - Amphipoda - Camacho faroensis - NE Atlantic - Continental slope - Hard bottoms
