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A new genus of large hydrothermal vent-endemic gastropod (Neomphalina: Peltospiridae)

Chen, Chong; Linse, Katrin; Roterman, Christopher N; Copley, Jonathan T.; Rogers, Alex D.. 2015 A new genus of large hydrothermal vent-endemic gastropod (Neomphalina: Peltospiridae). Zoological Journal of the Linnean Society, 175 (2). 319-335. 10.1111/zoj.12279

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This article has been accepted for publication and will appear in a revised form in Zoological Journal of the Linnean Society, published by Wiley. Copyright Linnean Society of London.
Chen et al in press Gigantopelta.pdf - Accepted Version

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Abstract/Summary

Recently discovered hydrothermal vent fields on the East Scotia Ridge (ESR, 56–60°S, 30°W), Southern Ocean, and the South West Indian Ridge (SWIR, 37°S 49°E), Indian Ocean, host two closely related new species of peltospirid gastropods. Morphological and molecular (mitochondrial cytochrome c oxidase subunit I, COI) characterization justify the erection of Gigantopelta gen. nov. within the Peltospiroidae with two new species, Gigantopelta chessoia sp. nov. from ESR and Gigantopelta aegis sp. nov. from SWIR. They attain an extremely large size for the clade Neomphalina, reaching 45.7 mm in shell diameter. The oesophageal gland of both species is markedly enlarged. Gigantopelta aegis has a thick sulphide coating on both the shell and the operculum of unknown function. The analysis of a 579-bp fragment of the COI gene resulted in 19–28% pairwise distance between Gigantopelta and six other genera in Peltospiridae, whereas the range amongst those six genera was 12–28%. The COI divergence between the two newly described species of Gigantopelta was 4.43%. Population genetics analyses using COI (370 bp) of 30 individuals of each species confirmed their genetic isolation and indicate recent rapid demographic expansion in both species

Item Type: Publication - Article
Digital Object Identifier (DOI): 10.1111/zoj.12279
Programmes: BAS Programmes > BAS Programmes 2015 > Biodiversity, Evolution and Adaptation
BAS Programmes > Polar Science for Planet Earth (2009 - ) > Environmental Change and Evolution
Additional Keywords: Gigantopelta, East Scotia Ridge, Indian Ocean, population, genetics, Southern Ocean
Date made live: 28 Sep 2015 11:01 +0 (UTC)
URI: http://nora.nerc.ac.uk/id/eprint/501741

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