Just the once will not hurt: DNA suggests species lumping over two oceans in deep-sea snails (Cryptogemma)

Type Article
Date 2020-10
Language English
Author(s) Zaharias PaulORCID1, Kantor Yuri, I2, Fedosov Alexander E.2, Criscione FrancescoORCID3, Hallan AndersORCID3, Kano Yasunori4, Bardin Jeremie5, Puillandre Nicolas1
Affiliation(s) 1 : Sorbonne Univ, Inst Systemat Evolut Biodiversite ISYEB, Museum Natl Hist Nat, CIVRS,EPHE,Univ Antilles, 43 Rue Cuvier,CP 26, F-75005 Paris, France.
2 : Russian Acad Sci, AN Severtsov Inst Ecol & Evolut, Leninski Prospect 33, Moscow 119071, Russia.
3 : Australian Museum Sydney, Australian Museum Res Inst, Sydney, NSW 2010, Australia.
4 : Univ Tokyo, Atmosphere & Ocean Res Inst, 5-1-5 Kashiwanoha, Kashiwa, Chiba 2778564, Japan.
5 : Sorbonne Univ, Ctr Rech Paleontol Paris CR2P, UMR 7207, CNRS,MNHN,Site Pierre & Marie Curie, 4 Pl Jussieu, Paris 05, France.
Source Zoological Journal of the Linnean Society (0024-4082) (Wiley / Blackwell), 2020-10 , Vol. 190 , N. 2 , P. 532-557
DOI 10.1093/zoolinnean/zlaa010
WOS© Times Cited 9
Keyword(s) species delimitation, species description, ABGD, GMYC, PTP, deep-sea species, larval dispersal, cosmopolitan species

The practice of species delimitation using molecular data commonly leads to the revealing of species complexes and an increase in the number of delimited species. In a few instances, however, DNA-based taxonomy has led to lumping together of previously described species. Here, we delimit species in the genus Cryptogemma (Gastropoda: Conoidea: Turridae), a group of deep-sea snails with a wide geographical distribution, primarily by using the mitochondrial COI gene. Three approaches of species delimitation (ABGD, mPTP and GMYC) were applied to define species partitions. All approaches resulted in eight species. According to previous taxonomic studies and shell morphology, 23 available names potentially apply to the eight Cryptogemma species that were recognized herein. Shell morphometrics, radular characters and geographical and bathymetric distributions were used to link type specimens to these delimited species. In all, 23 of these available names are here attributed to seven species, resulting in 16 synonymizations, and one species is described as new: Cryptogemma powelli sp. nov. We discuss the possible reasons underlying the apparent overdescription of species within Cryptogemma, which is shown here to constitute a rare case of DNA-based species lumping in the hyper-diversified superfamily Conoidea.

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Zaharias Paul, Kantor Yuri, I, Fedosov Alexander E., Criscione Francesco, Hallan Anders, Kano Yasunori, Bardin Jeremie, Puillandre Nicolas (2020). Just the once will not hurt: DNA suggests species lumping over two oceans in deep-sea snails (Cryptogemma). Zoological Journal of the Linnean Society, 190(2), 532-557. Publisher's official version : https://doi.org/10.1093/zoolinnean/zlaa010 , Open Access version : https://archimer.ifremer.fr/doc/00688/79988/