Crossing the polar front—Antarctic species discovery in the nudibranch genus Tritoniella (Gastropoda)

Tritoniella belli is the only valid species of a nudibranch genus endemic to the Southern Ocean. Recent exhaustive sampling and molecular analyses led to the discovery of several new lineages. A total of 69 specimens were collected from 25 sites across the Weddell and Scotia Seas, from 5 to 751 m de...

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Autores: Schächinger, Peter M., Schrödl, Michael, Wilson, Nerida G., Moles, Juan
Tipo de recurso: artículo
Estado:Versión aceptada para publicación
Fecha de publicación:2022
País:España
Institución:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
Repositorio:Recercat. Dipósit de la Recerca de Catalunya
OAI Identifier:oai:recercat.cat:2445/224161
Acceso en línea:https://hdl.handle.net/2445/224161
Access Level:acceso abierto
Palabra clave:Antàrtic (Oceà)
Llimacs
Gastròpodes
Antarctic Ocean
Deroceras
Gastropods
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spelling Crossing the polar front—Antarctic species discovery in the nudibranch genus Tritoniella (Gastropoda)Schächinger, Peter M.Schrödl, MichaelWilson, Nerida G.Moles, JuanAntàrtic (Oceà)LlimacsGastròpodesAntarctic OceanDerocerasGastropodsTritoniella belli is the only valid species of a nudibranch genus endemic to the Southern Ocean. Recent exhaustive sampling and molecular analyses led to the discovery of several new lineages. A total of 69 specimens were collected from 25 sites across the Weddell and Scotia Seas, from 5 to 751 m depth. In this study, we provide morphological and anatomical characters to describe five new Tritoniella species, namely T. gnocchi n. sp., T. prinzess n. sp., T. gnathodentata n. sp., T. schoriesi n. sp., T. heideae n. sp. Detailed descriptions of colouration, external morphology, digestive and reproductive organs, distribution, and ecology are presented in a systematic context. These are compared to the type material from the Ross Sea of T. belli and its synonym T. sinuata, whose status requires additional sampling to be solved. Discrete differences in external characters, including the shape of dorsal notum ridge and mantle edges, support the species hypotheses delimited by Moles, Berning et al. (2021). Moreover, detailed scanning electron microscopy images of the masticatory border of the jaws, radula teeth, and penial papilla were provided and their differences discussed. The gut content of all species revealed sclerites of Primnoidae gorgonians as their preferred prey. Pseudo-cryptic radiations along the Scotia Arc, explained by the combination of distribution reduction due to glacial cycles and the existence of refugia, and enhanced by their direct development, could explain the allopatric speciation events in Tritoniella species.Springer Verlag2025202520222025info:eu-repo/semantics/articleinfo:eu-repo/semantics/acceptedVersion26 p.application/pdfhttps://hdl.handle.net/2445/224161Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)reponame:Recercat. Dipósit de la Recerca de Catalunyainstname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)InglésVersió postprint del document publicat a: https://doi.org/10.1007/s13127-022-00541-3Organisms Diversity & Evolution, 2022, vol. 22, num.2, p. 431-456https://doi.org/10.1007/s13127-022-00541-3(c) Springer Verlag, 2022info:eu-repo/semantics/openAccessoai:recercat.cat:2445/2241612026-05-29T05:05:01Z
dc.title.none.fl_str_mv Crossing the polar front—Antarctic species discovery in the nudibranch genus Tritoniella (Gastropoda)
title Crossing the polar front—Antarctic species discovery in the nudibranch genus Tritoniella (Gastropoda)
spellingShingle Crossing the polar front—Antarctic species discovery in the nudibranch genus Tritoniella (Gastropoda)
Schächinger, Peter M.
Antàrtic (Oceà)
Llimacs
Gastròpodes
Antarctic Ocean
Deroceras
Gastropods
title_short Crossing the polar front—Antarctic species discovery in the nudibranch genus Tritoniella (Gastropoda)
title_full Crossing the polar front—Antarctic species discovery in the nudibranch genus Tritoniella (Gastropoda)
title_fullStr Crossing the polar front—Antarctic species discovery in the nudibranch genus Tritoniella (Gastropoda)
title_full_unstemmed Crossing the polar front—Antarctic species discovery in the nudibranch genus Tritoniella (Gastropoda)
title_sort Crossing the polar front—Antarctic species discovery in the nudibranch genus Tritoniella (Gastropoda)
dc.creator.none.fl_str_mv Schächinger, Peter M.
Schrödl, Michael
Wilson, Nerida G.
Moles, Juan
author Schächinger, Peter M.
author_facet Schächinger, Peter M.
Schrödl, Michael
Wilson, Nerida G.
Moles, Juan
author_role author
author2 Schrödl, Michael
Wilson, Nerida G.
Moles, Juan
author2_role author
author
author
dc.subject.none.fl_str_mv Antàrtic (Oceà)
Llimacs
Gastròpodes
Antarctic Ocean
Deroceras
Gastropods
topic Antàrtic (Oceà)
Llimacs
Gastròpodes
Antarctic Ocean
Deroceras
Gastropods
description Tritoniella belli is the only valid species of a nudibranch genus endemic to the Southern Ocean. Recent exhaustive sampling and molecular analyses led to the discovery of several new lineages. A total of 69 specimens were collected from 25 sites across the Weddell and Scotia Seas, from 5 to 751 m depth. In this study, we provide morphological and anatomical characters to describe five new Tritoniella species, namely T. gnocchi n. sp., T. prinzess n. sp., T. gnathodentata n. sp., T. schoriesi n. sp., T. heideae n. sp. Detailed descriptions of colouration, external morphology, digestive and reproductive organs, distribution, and ecology are presented in a systematic context. These are compared to the type material from the Ross Sea of T. belli and its synonym T. sinuata, whose status requires additional sampling to be solved. Discrete differences in external characters, including the shape of dorsal notum ridge and mantle edges, support the species hypotheses delimited by Moles, Berning et al. (2021). Moreover, detailed scanning electron microscopy images of the masticatory border of the jaws, radula teeth, and penial papilla were provided and their differences discussed. The gut content of all species revealed sclerites of Primnoidae gorgonians as their preferred prey. Pseudo-cryptic radiations along the Scotia Arc, explained by the combination of distribution reduction due to glacial cycles and the existence of refugia, and enhanced by their direct development, could explain the allopatric speciation events in Tritoniella species.
publishDate 2022
dc.date.none.fl_str_mv 2022
2025
2025
2025
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/acceptedVersion
format article
status_str acceptedVersion
dc.identifier.none.fl_str_mv https://hdl.handle.net/2445/224161
url https://hdl.handle.net/2445/224161
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv Versió postprint del document publicat a: https://doi.org/10.1007/s13127-022-00541-3
Organisms Diversity & Evolution, 2022, vol. 22, num.2, p. 431-456
https://doi.org/10.1007/s13127-022-00541-3
dc.rights.none.fl_str_mv (c) Springer Verlag, 2022
info:eu-repo/semantics/openAccess
rights_invalid_str_mv (c) Springer Verlag, 2022
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv 26 p.
application/pdf
dc.publisher.none.fl_str_mv Springer Verlag
publisher.none.fl_str_mv Springer Verlag
dc.source.none.fl_str_mv Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)
reponame:Recercat. Dipósit de la Recerca de Catalunya
instname:Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
instname_str Varias* (Consorci de Biblioteques Universitáries de Catalunya, Centre de Serveis Científics i Acadèmics de Catalunya)
reponame_str Recercat. Dipósit de la Recerca de Catalunya
collection Recercat. Dipósit de la Recerca de Catalunya
repository.name.fl_str_mv
repository.mail.fl_str_mv
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score 15,812455

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