Details

Autor(en) / Beteiligte

• Alalykina, Inna L.
• Polyakova, Neonila E.

Titel

New species of Ophryotrocha (Annelida: Dorvilleidae) associated with deep-sea reducing habitats in the Bering Sea, Northwest Pacific

Ist Teil von

• Deep-sea research. Part II, Topical studies in oceanography, 2022-12, Vol.206, p.105217, Article 105217

Ort / Verlag

Elsevier Ltd

Erscheinungsjahr

2022

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Four species of Ophryotrocha (Annelida, Dorvilleidae) from deep-sea reducing habitats (methane seeps on the Koryak slope and hydrothermal vents of the submarine Piip Volcano) were collected in the western part of the Bering Sea, NW Pacific. Descriptions of two of these new Ophryotrocha species, namely O. beringiana sp. nov. and O. seepens sp. nov., confirmed with molecular analyses, are presented herein. The detailed descriptions with electron microscopy illustrations for the new species are presented and their differences from similar species are discussed. In addition to the morphological description, the phylogenetic relationships of the new dorvilleids are provided using two nuclear (18S RNA, histone H3) and two mitochondrial (16S RNA and cytochrome c oxidase subunit 1, COI) markers in an analysis containing 54 terminal taxa. Phylogenetic analyses using MrBayes and Maximum Likelihood analyses show that O. beringiana sp. nov. and O. seepens sp. nov. are sister species, and together with O. platykephale, O. globopalpata and O. flabella form a subclade of deep-sea Pacific species within a clade referred to here as ‘globopalpata–platykephale’. In our molecular analysis, the clade currently consists of ten species, nine of those (except for O. longidentata, the only shallow Atlantic species not reported in chemosynthetic habitats) have been described from Pacific deep-sea reducing environments (hydrothermal vents, cold methane seeps, whale-falls). The ecology and geographic distribution of the reported species are discussed.