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Issue: Vol. 4353 No. 1: 22 Nov. 2017
Type: Article
Published: 2017-11-22
DOI: 10.11646/zootaxa.4353.1.3
Page range: 51–68
Abstract views: 193
PDF downloaded: 30

A new species of Raricirrus (Annelida: Cirratuliformia) from deep-water sunken wood off California

Department of Biology, University of Hawaii at Manoa, 2538 McCarthy Mall, Honolulu, Hawaii 96822, USA Water Resources Research Center, University of Hawaii at Manoa, 2540 Dole Street, Honolulu, Hawaii 96822, USA
British Antarctic Survey, High Cross, Madingely Road, Cambridge CB3 0ET, UK
Department of Life Sciences, Natural History Museum, Cromwell Rd, London SW7 5BD, UK.
Annelida Taxonomy new species Raricirrus wood falls Cirratulidae Ctenodrilidae 16S COI

Abstract

The genus Raricirrus is characterized by the absence of feeding palps, presence of filamentous branchiae, posterior segments shorter and wider than preceding ones, and by having diverse types of chaetae, including serrate capillaries, long natatory capillaries, falcate and finely pectinate, coarsely serrate chaetae and simple curved spines. A new species of Raricirrus is proposed based on morphological and mitochondrial DNA data. The K2P distance comparison of 16S and COI sequences from Raricirrus specimens collected from sunken wood in the deep-sea (3100 m) off Monterey, California, differed in less than 0.02 in both loci from those of another undescribed Raricirrus species collected at deep-sea hydrothermal vents in the East Scotia Ridge, Southern Ocean, and they are considered conspecific. This species is unique among its congeners by the lack of serrate chaetae, presence of acicular spines and neuropodial capillaries. Raricirrus jennae sp. nov. has only long capillaries on anterior notopodia, straight acicular spines with companion capillaries on posterior notopodia (from chaetigers 15–20), and similar acicular spines and companion capillaries throughout neuropodia. Raricirrus jennae sp. nov. appears to be an opportunistic and widely distributed species. The genus Raricirrus is emended to include the presence of acicular spines and keys to all cirratulid and ctenodrilid genera and Raricirrus species are presented.

 

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