FIGURE 30 - uploaded by James A. Blake
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Leodamas mucronatus n. sp. Holotype (USNM 1622271): A, anterior end, dorsal view; B, anterior end, ventral view; C, posterior end with pygidium, dorsal view; D, smaller ribbed neuropodial uncini and larger smooth spine from setigers 1-2; E, large ribbed uncini from thoracic setigers 3-16; F-H, upper and lower uncini from setiger 18; I-K, abdominal neuropodial acicula; L, furcate seta.
Source publication
Twenty-four species of Orbiniidae, 12 new to science, are reported from continental shelf and slope (deep-sea) habitats of the western North Atlantic. The majority of new material was collected during reconnaissance and monitoring surveys along the entire U.S. Atlantic coast from New England to the Carolinas that were intended to understand the pot...
Similar publications
Six species of Caulleriella (Cirratulidae), four new to science, are reported from continental shelf and slope depths of the western North Atlantic. The majority of new material was collected as part of deep-water reconnaissance and monitoring surveys along the U.S. Atlantic coast from New England to the Carolinas that were intended to understand t...
Citations
... The genus Orbiniella is the fifth most diverse genus in Orbiniidae with 22 valid species (Blake 2021). Most species (i.e., 13 of 22) occur in deep-water habitats exceeding 1000 m, with some of them inhabiting hypoxic biotopes, such as hydrothermal vents (e.g., Orbiniella hobsonae Blake & Hilbig, 1990) or the Clarion-Clipperton Fracture Zone in the abyssal Pacific Ocean (e.g., Orbiniella abyssalis Blake, 2020). ...
... After the first described species of the genus, Orbiniella minuta Day, 1954, the number of species was increasing slowly with 11 species known until recently. The drastic increase in Orbiniella species number happened in the last seven years with 12 more species described (Blake 2017(Blake , 2020(Blake , 2021Georgieva et al. 2023), with most coming from deep-sea habitats. ...
... However, the wide annuli are always associated with parapodia, and the narrow annuli are always located between the parapodia. Parapar et al. (2015) and Blake (2017Blake ( , 2020Blake ( , 2021 considered segmental annulation being an informative character in species identification. In the present study, we describe the annulation patters as the number of narrow rings between the parapodia. ...
In this work, the diversity of the genus Orbiniella in the Nordic Seas and the North Atlantic waters south of Iceland is studied based on the analyses of molecular markers (mitochondrial COI, 16S rDNA and nuclear ITS2) and morphological characters. Our results showed the presence of at least five genetic lineages in the studied material which could also be morphologically identified by their segmental annulation patterns, the number and the shape of acicular spines, and the length and the shape of pygidial lobes. The species name Orbiniella petersenae is assigned to one of the lineages restricting its geographical and vertical distribution to the deep-sea areas north of Iceland and Jan Mayen, and three lineages are described as new species (i.e., Orbiniella griegi Meca & Budaeva, sp. nov., Orbiniella mayhemi Meca & Budaeva, sp. nov., and Orbiniella parapari Meca & Budaeva, sp. nov.) elevating the number of known species in the genus to 25. Three deep-sea species of Orbiniella in our study are reported only north of the Greenland-Iceland-Scotland Ridge, one deep-sea species found south of the ridge. A single shallow-water species is distributed along the ridge and on the Norwegian shelf.
... Los Orbiniidae se distinguen de otros anélidos por un prostomio cónico o redondeado sin apéndices, cuerpo subdividido en tórax y abdomen, branquias dispuestas dorsalmente y lóbulos parapodiales en el abdomen, y un tipo único de quetas capilares crenuladas (Blake, 2017). Las revisiones más completas sobre esta familia han sido realizadas por Blake (2000Blake ( , 2017Blake ( , 2021 y, a escala regional, por López (2012). ...
... Blake (2017) revisó el diagnóstico de los géneros y descartó la posición del primer par de branquias como carácter taxonómico importante. Según esto, en la actualidad se conocen un total de 33 especies de Leodamas en el mundo (Blake 2017(Blake , 2020(Blake , 2021Sun et al. 2018), aunque la reevaluación de los caracteres sin duda aumentará el número, bien por nuevas descripciones o por la reubicación de algunas. Por ejemplo, dos especies mediterráneas, Scoloplos haasi (Monro, 1937) y Scoloplos typicus (Eisig, 1914), presentan gruesos uncini neuropodiales en el tórax. ...
... Orbiniidae can be distinguished from other annelids by a conical or rounded prostomium without appendages, body subdivided into thorax and abdomen, dorsally disposed branchiae and parapodial lobes in the abdomen, and a unique type of crenelated capillary chaetae (Blake 2017). A great revision of the literature on orbiniids was made by Blake (2000Blake ( , 2017Blake ( , 2021, with the review of the definition of known genera or the erection of new ones from subgeneric status. At a regional scale, the family has been thoroughly revised by López (2012). ...
... Blake (2017) revised the diagnosis of the genera and dismissed the position of the first pair of branchiae as important taxonomic character. According to this, a total of 33 species of Leodamas are known worldwide (Blake 2017(Blake , 2020(Blake , 2021Sun et al. 2018), with Leodamas chevalieri candiensis (Harmelin, 1969) as the only previously known Mediterranean species of the genus. However, the revaluation of the characters will rise the number as several species referred to Scoloplos might fall within the new diagnosis. ...
Invasive species, including many polychaetes, are one of the major factors affecting the diversity of the Mediterranean ecosystems. Coastal lagoons, as transitional ecosystems, present a large spatial and temporal variability that makes them suitable for opportunistic species colonization. In this work, the species Leodamas australiensis (Hartmann-Schröder, 1979) has been identified in the Mar Menor coastal lagoon (Spain) and this is its first report from the Mediterranean. It is characterized by the presence of large aciculae with protruding and distinctly curved tips in abdominal neuropodia and by the onset of dorsal branchiae on chaetiger 6. Molecular analyses were carried out using mitochondrial 16S rDNA gene sequences. The spatio-temporal distribution of L. australiensis and its relationship with other species belonging to the family Orbiniidae in the lagoon was investigated in different periods from 1982 to 2018. This species expanded from sites more connected to the Mediterranean Sea towards more confined areas of the basin. However, this expansion did not affect in an appreciable manner to native orbiniids. Follow-up studies at longer time scales are needed to determine if L. australiensis is a casual presence or maintains a well-established population.
... The validity of the family Questidae has been questioned since a set of morphological characteristics suggest a closer phylogenetic affinity with Orbiniidae or Paraonidae (Rouse & Fauchald 1997;Giere et al. 2008). Indeed, molecular phylogenetic analyses have recovered members of Questidae nested within Orbiniidae; therefore, the genus Questa has been included in the family Orbiniidae (Bleidorn 2005;Rousset et al. 2007;Giere et al. 2008;Blake 2021), within the well-defined monogenetic the subfamily Questinae (see WoRMS 2023). ...
We here report two new species of meiofaunal orbiniids belonging to the genus Questa Hartman, 1966, which have been discovered during benthic surveys conducted around the Azores and the Canary Islands. The new species, Q. manuelgerardi n. sp. and Questa ericnunezi n. sp., are described, figured and discussed in detail. Questa manuelgerardi n. sp., endemic from the Azores, is characterized by the lack of furcate chaetae and branchiae, and by the presence of two pairs of anal cirri. Questa ericnunezi endemic from the Canary Island, is defined by the presence of furcate chaetae, 12–18 pairs of branchiae, and two pairs of anal cirri. In addition, new records of the species Q. caudicirra Hartman, 1966 are provided. An identification key to the 12 known species of Questa is also included.
... Orbiniidae can be distinguished from other annelids by a conical or rounded prostomium without appendages, body subdivided into thorax and abdomen, dorsally disposed branchiae and parapodial lobes in the abdomen, and a unique type of crenelated capillary chaetae (Blake 2017). A great revision of the literature on orbiniids was made by Blake (2000Blake ( , 2017Blake ( , 2021, with the review of the definition of known genera or the erection of new ones from subgeneric status. At a regional scale, the family has been thoroughly revised by López (2012). ...
... Blake (2017) revised the diagnosis of the genera and dismissed the position of the first pair of branchiae as important taxonomic character. According to this, a total of 33 species of Leodamas are known worldwide (Blake 2017(Blake , 2020(Blake , 2021Sun et al. 2018), with Leodamas chevalieri candiensis (Harmelin, 1969) as the only previously known Mediterranean species of the genus. However, the revaluation of the characters will rise the number as several species referred to Scoloplos might fall within the new diagnosis. ...
Coastal lagoons, because of their characteristics, are among the most productive and valuable coastal ecosystems. Because of this, these ecosystems offer ideal conditions for opportunistic species, and, therefore, many NIS. The knowledge and control of invasive species is still one of the greatest challenges in the management and conservation of coastal marine ecosystems. The effort of this must be put on their impact on the functioning and loss of services of ecosystems. Coastal lagoons, under its conditions of transitional and, therefore, systems with strong environmental gradients, are considered among the most valuable ecosystems in the World. Because of the same conditions, these ecosystems represent a hot spot in the colonization of many non-indigenous species. In this communication, we present new records of two species of Polychaeta: Timarete caribous (Grube, 1859) (Cirratulidae), and Leodamas australiensis (Hartmann-Schröder, 1979) (Orbiniidae), in a Western Mediterranean coastal lagoon, the Mar Menor (Murcia, SE Spain). Both species were found under a long-term monitoring sampling design developed in different benthic communities within the lagoon. Description, taxonomic remarks, and their ecology and distribution in the lagoon, were analysed. Despite each species found belong to different biocenoses studied, their share the influence of the Mediterranean Sea for the colonization process. Therefore, for the case of T. caribous, this species forms dense aggregations on hard bottoms of anthropogenic origin, such ports, or docks. For the contrast, L. australiensis were found mainly in soft bottoms mostly on mud, or Caulerpa prolifera (Forsskål) J.V.Lamouroux, 1809 meadows. Through the study of their ecology within the ecosystem, these long-term monitoring studies are essential to determine if these species represent an affection of the ecosystem services, or for the contrast, could help to the natural heterogeneity and the homeostatic responses of these coastal ecosystems.
... nov., as well as juvenile specimens represent the same species (Fig. 19). Currently, the understanding of developmental stages in Orbiniidae is limited despite some recent advances (see Blake, 2021) and we thus tentatively ascribe the specimens without neuropodial postchaetal lobes to Orbiniella sp., rather than Orbiniella sp. nov. ...
In the deep ocean, whale falls (deceased whales that sink to the seafloor) act as a boost of productivity in this otherwise generally food-limited setting, nourishing organisms from sharks to microbes during the various stages of their decomposition. Annelid worms are habitual colonizers of whale falls, with new species regularly reported from these settings and their systematics helping to resolve biogeographic patterns among deep-sea organic fall environments. During a 2017 expedition of the Australian research vessel RV Investigator to sample bathyal to abyssal communities off Australia’s east coast, a natural whale fall was opportunistically trawled at ~1000 m depth. In this study, we provide detailed taxonomic descriptions of the annelids associated with this whale-fall community, using both morphological and molecular techniques. From this material we describe nine new species from five families (Dorvilleidae: Ophryotrocha dahlgreni sp. nov. Ophryotrocha hanneloreae sp. nov., Ophryotrocha ravarae sp. nov.; Hesionidae: Vrijenhoekia timoharai sp. nov.; Nereididae: Neanthes adriangloveri sp. nov., Neanthes visicete sp. nov.; Orbiniidae: Orbiniella jamesi sp. nov.), including two belonging to the bone-eating genus Osedax (Siboglinidae: Osedax waadjum sp. nov., Osedax byronbayensis sp. nov.) that are the first to be described from Australian waters. We further provide systematic accounts for 10 taxa within the Ampharetidae, Amphinomidae, Microphthalmidae, Nereididae, Orbiniidae, Phyllodocidae, Protodrilidae, Sphaerodoridae and Phascolosomatidae. Our investigations uncover unique occurrences and for the first time enable the evaluation of biogeographic links between Australian whale falls and others in the western Pacific as well as worldwide.
... Hartman (1957) reviewed this genus and described four species in detail, including the type species, P. felix Kinberg, 1866. Subsequently, Day (1961, 1977, Mohammad (1980), Hartmann-Schröder and Rosenfeld (1990), and Blake (2017Blake ( , 2020Blake ( , 2021 described additional Phylo species. According to this literature, 14 species of Phylo are currently recognized and considered valid (Blake 2021;Read and Fauchald 2021). ...
... Subsequently, Day (1961, 1977, Mohammad (1980), Hartmann-Schröder and Rosenfeld (1990), and Blake (2017Blake ( , 2020Blake ( , 2021 described additional Phylo species. According to this literature, 14 species of Phylo are currently recognized and considered valid (Blake 2021;Read and Fauchald 2021). ...
A new species of the orbiniid genus Phylo Kinberg, 1866, P. heterochaetus sp. nov. , is described based on material collected from the northern Yellow Sea, China. This is the thirteenth species in Phylo . The new species can be easily identified by the combination of the following characters: anterior thorax with 13 chaetigers, interramal cirri absent, anterior thoracic neuropodia with 4 or 5 rows of uncini, intermixed with a few subuluncini in the first 1 or 2 rows, and a ventral fringe of numerous stomach papillae present on chaetigers 12–24. Phylo fimbriata is recorded for the first time from China seas.
We performed a comparative study of the specimens from the Naineris setosa complex from the Pacific and the Atlantic Oceans and re-described the syntype of N. setosa, including the selection of the lectotype. Molecular phylogenetic and species delimitation analyses based on two mitochondrial (COI and 16S) and one nuclear (28S) marker revealed the presence of three species. One clade with wide Amphi-Atlantic distribution was attributed as Naineris setosa s. str. The second Atlantic clade restricted to Southern and Southeastern Brazil was described as a new species, Naineris lanai sp. n. The third clade, reported from the Northwestern Pacific, was identified as a new species but was not formally described due to the presence of only juvenile-sized worms in the studied material. Detailed morphological descriptions of several diagnostic characters in the Naineris setosa complex are provided.
