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Issue: Vol. 998 No. 1: 27 May. 2005
Type: Articles
Published: 2005-05-27
DOI: 10.11646/zootaxa.998.1.1
Page range: 1–14
Abstract views: 72
PDF downloaded: 3

On the phylogenetic relationships of Axiokebuita, Travisia and Scalibregmatidae (Polychaeta)

Jenny Persson, Department of Zoology, University of Göteborg, PO Box 463, SE–405 30 Göteborg, Sweden
Fredrik Pleijel, Department of Marine Ecology, Tjärnö Marine Biological Laboratory, Göteborg University, SE–452 96 Strömstad, Sweden, and Muséum national d’Histoire naturelle, Département Systématique et Evolution, CNRS UMR 7138, “Systématique, Adaptation, Evolution”, 43 rue Cuvier, 75231 Paris Cedex 05, France
Annelida Axiokebuita Scalibregmatidae Travisia Polychaeta phylogeny morphology 18S rDNA 28S rDNA

Abstract

We provide a description of newly collected specimens of Axiokebuita Pocklington & Fournier from Norway, previously known only from east Canada and the Antarctic. Due to delineation problems between the only two described species, A. minuta (Hartman) and A. millsi Pocklington & Fournier, these new specimens cannot unambiguously be referred to either species. Previously unnoticed adhesive papillae on the pygidium are present in both species and may constitute an apomorphy for Axiokebuita. The taxon lacks many morphological features otherwise characteristic for scalibregmatids, and to assess its affinities we present 18S rDNA and 28S rDNA-based analyses together with six other scalibregmatids and twenty other polychaetes. A nemertean is used as outgroup. All analyses support that Axiokebuita is a scalibregmatid. Furthermore, Travisia Johnston, traditionally referred to the Opheliidae, is nested within the scalibregmatids, as sister to Neolipobranchius Hartman & Fauchald. Arenicolidae and Maldanidae may constitute the sister group of scalibregmatids.

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