1 Zoological Journal of the Linnean Society Archimer October 2020, Volume 190 Issue 2 Pages 532-557 https://doi.org/10.1093/zoolinnean/zlaa010 https://archimer.ifremer.fr https://archimer.ifremer.fr/doc/00688/79988/ Just the once will not hurt: DNA suggests species lumping over two oceans in deep-sea snails (Cryptogemma) Zaharias Paul 1, *, Kantor Yuri, I 2, Fedosov Alexander E. 2, Criscione Francesco 3, Hallan Anders 3, Kano Yasunori 4, Bardin Jeremie 5, Puillandre Nicolas 1 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. * Corresponding author : Paul Zaharias, email address :
[email protected] Abstract : 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.