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Whale falls, multiple colonisations of the deep, and the phylogeny of Hesionidae (Annelida)

Artikel i vetenskaplig tidskrift
Författare M. Summers
Fredrik Pleijel
G. W. Rouse
Publicerad i Invertebrate Systematics
Volym 29
Nummer/häfte 2
Sidor 105-123
ISSN 1445-5226
Publiceringsår 2015
Publicerad vid Institutionen för biologi och miljövetenskap, Tjärnö marinbiologiska laboratorium
Sidor 105-123
Språk en
Länkar dx.doi.org/10.1071/is14055
Ämnesord Annelida, deep-sea, eastern Pacific, polychaete, HYDROTHERMAL VENT, POLYCHAETA, MORPHOLOGY, AMPHARETIDAE, ALIGNMENTS, CALIFORNIA, ACICULATA, BIOLOGY, BLOCKS, BASIN, Evolutionary Biology, Zoology
Ämneskategorier Biologiska vetenskaper

Sammanfattning

Phylogenetic relationships within Hesionidae Grube, 1850 are assessed via maximum parsimony and maximum likelihood analyses of mitochondrial (cytochrome c oxidase subunit I and 16S rRNA) and nuclear (18S rRNA, and 28S rRNA) data. The analyses are based on 42 hesionid species; six of these being new species that are described here. The new species, all from deep (>200m depth) benthic environments (including whale falls) in the eastern Pacific, are Gyptis shannonae, sp. nov., Neogyptis julii, sp. nov., Sirsoe sirikos, sp. nov., Vrijenhoekia ketea, sp. nov., Vrijenhoekia falenothiras, sp. nov., and Vrijenhoekia ahabi, sp. nov. The molecular divergence among the new members of Vrijenhoekia is pronounced enough to consider them cryptic species, even though we cannot distinguish among them morphologically. Our results also showed that the subfamily Hesioninae Grube, 1850, as traditionally delineated, was paraphyletic. We thus restrict Hesioninae to include only Hesionini Grube, 1850 and refer the remaining members to Psamathinae Pleijel, 1998. The present study increases the number of hesionid species associated with whale falls from one to six and markedly increases the number of described deep-sea hesionid taxa. There appear to have been multiple colonisations of the deep sea from shallow waters by hesionids, though further sampling is warranted.

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