The new Arctic side-gilled sea slug genus Boreoberthella (Gastropoda, Opisthobranchia): Pleurobranchoidean systematics and evolution revisitedстатья
Информация о цитировании статьи получена из
Web of Science,
Scopus
Статья опубликована в журнале из списка Web of Science и/или Scopus
Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Аннотация:Most of the ca. 100 known pleurobranchoid side gilled sea slug species are confned to temperate and warm coastal waters worldwide. Exceptions were Wve enig-matic Antarctic and southern deep sea species. Herein the Wrst Arctic deep water pleurobranchid, Boreoberthella
augustagen. et spec. nov., is anatomically described. To reveal the origin, relationships and phylogeography of Boreoberthella, a cladistic analysis of 24 pleurobranchoid
taxa representing all genera and traditional higher groups was prepared. The morphological data set includes 72 characters; many of them, such as details of the copulatory apparatus,
were explored for the first time. The monophyly of both Pleurobranchoidea and Pleurobranchaeidae is confrmed. In contrast to an earlier study,the southern Ocean deep-water species Tomthompsonia antarcticaresults as basal ofshoot
of the monophyletic though poorly supported Pleurobranchidae which show a secondary, internal shell. The traditional genus Berthella with worldwide temperate and tropical
members may represent an evolutionary grade rather than a clade. The monotypic genera Parabathyberthella and Polictenidia are synonymized with Bathyberthella according to taxonomic and phylogenetic evidence. The basal pleurobranchaeid genus Pleurobranchella, together with Tomthompsonia, Bathyberthella, and Boreoberthella are discussed as potential relics of a cold-water related early nudipleuran radiation in Antarctica, with subsequent dispersal through the depths of the world oceans. The ancestor of Pleurobranchus species, the closest relatives of Boreoberthella, colonized coastal and warmer waters and radiated there.