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

Chong Chen*, Katrin Linse, Christopher N. Roterman, Jonathan T. Copley, Alex D. Rogers

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

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 45.7mm 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 (370bp) of 30 individuals of each species confirmed their genetic isolation and indicate recent rapid demographic expansion in both species.

Original languageEnglish
Pages (from-to)319-335
Number of pages17
JournalZoological Journal of the Linnean Society
Volume175
Issue number2
Early online date23 Sep 2015
DOIs
Publication statusPublished - 1 Oct 2015

Keywords

  • East Scotia Ridge
  • Gigantopelta
  • Indian Ocean
  • population genetics
  • Southern Ocean
  • UKRI
  • NERC
  • NE/DO1249X/1
  • NE/H012087/1

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