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

Record type: Article

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.

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Citation

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

More information

Published date: October 2015
Keywords: East Scotia Ridge, Gigantopelta, Indian Ocean, population genetics, Southern Ocean
Organisations: Ocean and Earth Science

Identifiers

Local EPrints ID: 384870
URI: http://eprints.soton.ac.uk/id/eprint/384870
ISSN: 0024-4082
PURE UUID: d9577286-c6ff-4bc2-82c7-7d4e351fbd3c

Catalogue record

Date deposited: 07 Dec 2015 17:27
Last modified: 17 Jul 2017 20:01

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Contributors

Author: Chong Chen
Author: Katrin Linse
Author: Christopher N. Roterman
Author: Alex D. Rogers

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