Abstract
This paper contributes to a revision of the genus Halectinosoma. Four new species are described, based on examination of ectinosomatid material from localities in western Europe, eastern Canada and the Arctic. Halectinosoma mandibularis sp. nov. is distinguishable from other species by the reduced setation of the mouthparts and enlarged mandibular gnathobase. Halectinosoma latisetifera sp. nov. bears an affinity with H. cooperatum but is easily distinguished by the shape of the setae on the female fifth leg. A species previously erroneously ascribed to H. finmarchicum (Scott) by several authors is described here as Halectinosoma kliei sp. nov.Halectinosoma gothiceps (Giesbrecht) is redescribed and the closely related Halectinosoma paragothiceps sp. nov. is described and distinguished from H. gothiceps. It is considered likely that some previous records of H. gothiceps are in error. © 2007 The Linnean Society of London, Zoological Journal of the Linnean Society, 2007, 149, 453–475.
Highlights
Species of Halectinosoma are often dominant members of the harpacticoid copepod assemblage of marine sediments and yet their identification is notoriously difficult
Clément & Moore (1995) commenced a revision of Halectinosoma with a reappraisal of H. sarsi and descriptions of 11 related species. This was followed by redescriptions of H. elongatum (Sars, 1904) and H. herdmani (Scott & Scott, 1894), together with descriptions of related species (Clément & Moore, 2000)
In this third paper in the series we complete our description of new species by consideration of four new species from the North Atlantic and Arctic regions
Summary
Species of Halectinosoma are often dominant members of the harpacticoid copepod assemblage of marine sediments and yet their identification is notoriously difficult. Differences between species within this large genus of around 63 species are often subtle and a lack of appreciation of this subtlety has caused much taxonomic confusion This has led to the production of descriptions that, in many cases, do not permit the accurate identification of species. Clément & Moore (1995) commenced a revision of Halectinosoma with a reappraisal of H. sarsi and descriptions of 11 related species This was followed by redescriptions of H. elongatum (Sars, 1904) and H. herdmani (Scott & Scott, 1894), together with descriptions of related species (Clément & Moore, 2000). In this third paper in the series we complete our description of new species by consideration of four new species from the North Atlantic and Arctic regions. A final paper, yet to be published, will consider the
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