Phylogeography of hydrothermal vent stalked barnacles: a new species fills a gap in the Indian Ocean 'dispersal corridor' hypothesis

Royal Society Open Science
Hiromi Kayama WatanabeBenny K K Chan

Abstract

Phylogeography of animals provides clues to processes governing their evolution and diversification. The Indian Ocean has been hypothesized as a 'dispersal corridor' connecting hydrothermal vent fauna of Atlantic and Pacific oceans. Stalked barnacles of the family Eolepadidae are common associates of deep-sea vents in Southern, Pacific and Indian oceans, and the family is an ideal group for testing this hypothesis. Here, we describe Neolepas marisindica sp. nov. from the Indian Ocean, distinguished from N. zevinae and N. rapanuii by having a tridentoid mandible in which the second tooth lacks small elongated teeth. Morphological variations suggest that environmental differences result in phenotypic plasticity in the capitulum and scales on the peduncle in eolepadids. We suggest that diagnostic characters in Eolepadidae should be based mainly on more reliable arthropodal characters and DNA barcoding, while the plate arrangement should be used carefully with their intraspecific variation in mind. We show morphologically that Neolepas specimens collected from the South West Indian Ridge, the South East Indian Ridge and the Central Indian Ridge belong to the new species. Molecular phylogeny and fossil evidence indicated that Neolep...Continue Reading

References

Sep 15, 2001·Science·C L Van DoverR C Vrijenhoek
Dec 2, 2010·Nature Communications·Rolf B PedersenSteffen L Jorgensen
Oct 18, 2013·Molecular Biology and Evolution·Koichiro TamuraSudhir Kumar
Jan 21, 2015·Molecular Ecology·Santiago HerreraTimothy M Shank
Mar 2, 2016·Proceedings of the National Academy of Sciences of the United States of America·Satoshi MitaraiJames C McWilliams

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BETA
light microscopy
ESR

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Geneious
Clustal X
TOTO Caldera
Sigma Scan Pro
MEGA

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