WoRMS source details

Blake, James A. (2000). A new genus and species of polychaete worm (Family Orbiniidae) from methane seeps in the Gulf of Mexico, with a review of the systematics and phylogenetic interrelationships of the genera of Orbiniidae. Cahiers de Biologie Marine. 41(4): 435-450.
47618
Blake, James A.
2000
A new genus and species of polychaete worm (Family Orbiniidae) from methane seeps in the Gulf of Mexico, with a review of the systematics and phylogenetic interrelationships of the genera of Orbiniidae.
Cahiers de Biologie Marine
41(4): 435-450
Publication
World Polychaeta Database (WPolyD)
Available for editors  PDF available [request]
An abundant polychaete Methanoaricia dendrobranchiata gen. nov. et sp. nov., found in association with methane seeps (>500 m) in the Gulf of Mexico, has affiliations with the family Orbiniidae. These seepworms are large, up to 15 cm long, 7-9 mm wide anteriorly, with hundreds of crowded segments. Distinct body regions are absent. Branched branchiae extend over the entire body. The prostomium is narrow, elongate, directed ventrally, and bluntly rounded on the anterior margin. Eyes are absent: eversible nuchal papillae are present. The peristomium is reduced to a single, narrow achaetous ring. Parapodia bear long, laterally directed, cirriform noto- and neuropodial lamellae. Capillary chaetae have transverse rows of bristles. Narrow, pointed notopodial spines have a single subapical spur or secondary tooth. Neurochaetae of anterior chaetigers include a few threadlike capillaries, about 5 simple spines with weakly developed crenulations along their margins, and 3-4 emergent curved aciculae; spines are absent by the middle of the body. The pygidium has a terminal anus surrounded by several long, tapering cirri. The chaetal and branchial structure of these worms allies them most closely to the Orbiniidae despite the lack of distinct body regions. In order to understand the relationship of the seepworm with other orbiniid genera, a phylogenetic (cladistic) analysis was performed. The results of this analysis suggests that the current classification of orbiniid genera into subfamilies is not appropriate and a new classification is proposed that is based on increasing modification of body structure and chaetae. Two clades or subfamilies of Orbiniidae are proposed using these characters rather than the traditional peristomial ring structure. The seepworm appears to be a separate and distinct sister taxon
Gulf of Mexico
Abyssal, Deep-Sea
Systematics, Taxonomy
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2013-01-12 18:30:12Z
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2015-07-23 06:46:26Z
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Leodamas Kinberg, 1866 (status source)
Leodamas marginatus (Ehlers, 1897) (basis of record)
Leodamas robustus (Kinberg, 1866) (basis of record)
Methanoaricia Blake, 2000 (original description)
Methanoaricia dendrobranchiata Blake, 2000 (original description)
Methanoariciinae Blake, 2000 (additional source)
Microrbiniinae Blake, 2000 (original description)
Protoariciinae Hartman, 1957 accepted as Orbiniinae Hartman, 1942 (source of synonymy)
Scoloplos (Scoloplos) Blainville, 1828 represented as Scoloplos Blainville, 1828 (status source)
Holotype USNM 186776, geounit Gulf of Mexico, identified as Methanoaricia Blake, 2000
Holotype USNM 186776, geounit Gulf of Mexico, identified as Methanoaricia dendrobranchiata Blake, 2000
Paratype USNM 186777, geounit Gulf of Mexico, identified as Methanoaricia dendrobranchiata Blake, 2000
Paratype USNM 186777, geounit Gulf of Mexico, identified as Methanoaricia Blake, 2000
Paratype LACM AHF-Poly 1961, geounit Gulf of Mexico, identified as Methanoaricia Blake, 2000
Paratype USNM AHF-Poly 1961, geounit Gulf of Mexico, identified as Methanoaricia dendrobranchiata Blake, 2000
 Classification

nominal Scoloplos (Scoloplos) subgenus is now disused, subsequent to elevation of Leodamas as a full genus [details]

 Etymology

Methano, referring to the methane seep habitat of these worms and Aricia, Latin for nymph, the mythological wife of ... [details]

 Etymology

Dendro, from the Greek dendrion for tree, referring to the branched nature of the branchiae; branchos, Greek for gill.  [details]

 Taxonomy

Blake (2000) treated Leodamas as a full genus because of its heavy thoracic neuropodial spines, which differ from ... [details]