Mislabeling and nomenclatorial confusion of Typhlotanais sandersi Kudinova-Pasternak, 1985 (Crustacea: Tanaidacea) and establishment of a new genus

Abstract

Re-examination of historical collections allowed us to resolve the taxonomic status of Typhlotanais sandersi Kudinova-Pasternak, 1985, originally described based on a single specimen from Great-Meteor Seamount. The holotype of this species was considered lost and the species redescribed based on a second specimen from the type locality by Błażewicz-Paszkowycz (2007a), who placed Ty. sandersi on a newly established genus Typhlamia. Thorough morphological analysis of Typhlamia and Typhlotanais species and recently obtained genetic data of typhlotanaids from N Atlantic and NW Pacific waters allow us to conclude that the redescription of Ty. sandersi by Błażewicz-Paszkowycz (2007a) was based on a wrongly labelled specimen that, rather than a type of Ty. sandersi, represents in fact a new species of Typhlamia. The morphological comparison of the type species of Typhlotanais (Ty. aequiremis) with all ‘long-bodied’ typhlotanaid taxa with rounded pereonites margins (i.e., Typhlamia, Pulcherella, Torquella), and the use of genetic evidence, support the establishment of a new genus to accommodate: Ty. sandersi, Ty. angusticheles Kudinova-Pasternak, 1989, and a third species from N Atlantic waters, that is described here for the first time. Current knowledge on ‘long-bodied’ typhlotanaids with rounded pereonites is summarised and a taxonomical key for their identification provided.

Diversity under a magnifier lens: the case of Typhlotanaidae (Crustacea: Tanaidacea) in the N Atlantic

“…The Typhlotanaidae is recognized to be a highly diverse tanaidomorphan family whose persived polyphyletic nature has been frequently underlined 27 , 28 , 39 , 76 , 77 . Our phylogenetic results, which were based on two markers, should be considered only as a primary step towards complex phylogenetic studies of 'stout-bodied' forms of this family.…”

“…Currently, the Typhlotanaidae is represented by 100 nominal species distributed in 15 genera 39 – 42 contributing about 5% of all tanaidacean taxa and 14.5% of all known paratanaoid species, making them the most diverse family of paratanaoids. While establishing the family Sieg (1986) 43 stated that ‘Of these, Typhlotanais is still to be regarded as very heterogeneous, so that a further split is to be expected in the future’.…”

Diversity under a magnifier lens: The case of Typhlotanaidae in N Atlantic

“…Larsenotanais kamchatikus - Błażewicz-Paszkowycz (2007) 33 : 2, 13-17;Larsen & Shimomura (2007) 44 : 11;Stępień et al (2019) 45 : 3;Gellert et al (2022) 20 Diagnosis: Body 4.3 L:W. Pereonite-1 shorter than pereonite-2. Antenna article-2 with stiff seta; article-3 with stiff seta.…”