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This expectation is based on phylogenetic niche conservatism and shared dispersal constraints. However, within the subfamily Laevilitorininae, this pattern is not observed: Laevilitorina shows broader distributions and higher species richness than Laevilacunaria despite similar developmental mode and habitat preferences. Combining multilocus genetic data, radular morphology and model-based historical biogeography, we aim to understand the origins of these disparities in range extent. The paraphyly detected in both Laevilitorina and Laevilacunaria genus indicates a more complex history than a simple older\u2013younger genus contrast, with age and diversification distributed across four clades. Our dated analyses place the time to the most recent common ancestor (TMRCA) of Laevilitorininae at 52.2 Mya, with diversification within clades from the Miocene to Pleistocene. The sister genera show process-level contrasts: in Laevilitorina, broad ranges in some lineages are consistent with intermittent, macroalgal raft-mediated connectivity, whereas Laevilacunaria exhibits restricted ranges consistent with rare, storm-facilitated rafting that enables colonization without sustained gene flow. Overall, our findings support how stochastic long-distance dispersal and establishment can shape biogeographic patterns in the Southern Ocean and underscore the need to update systematic classifications.<\/jats:p>","DOI":"10.1098\/rspb.2025.2149","type":"journal-article","created":{"date-parts":[[2026,2,4]],"date-time":"2026-02-04T10:50:19Z","timestamp":1770202219000},"source":"Crossref","is-referenced-by-count":0,"title":["Tracing the origins of Antarctic periwinkles: an integrative morphological\u2013molecular perspective on\n                    <i>Laevilacunaria<\/i>\n                    evolution"],"prefix":"10.1098","volume":"293","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-4363-8018","authenticated-orcid":false,"given":"Sebasti\u00e1n","family":"Rosenfeld","sequence":"first","affiliation":[{"name":"Universidad de Chile 1 , ,","place":["Santiago, Chile, 7800003"],"department":["Laboratorio de Ecolog\u00eda Molecular, Departamento de Ciencias Ecol\u00f3gicas, Facultad de 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Islands, UK, FIQQ 1ZZ"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Paula","family":"Vidal","sequence":"additional","affiliation":[{"name":"Instituto Milenio Biodiversidad de Ecosistemas Ant\u00e1rticos y Subant\u00e1rticos 2 , ,","place":["Santiago, Chile, 7800003"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0996-4060","authenticated-orcid":false,"given":"Guillaume","family":"Schwob","sequence":"additional","affiliation":[{"name":"Instituto Milenio Biodiversidad de Ecosistemas Ant\u00e1rticos y Subant\u00e1rticos 2 , ,","place":["Santiago, Chile, 7800003"]},{"name":"Universit\u00e9 Claude Bernard Lyon 9 , ,","place":["Lyon, France"],"department":["Laboratoire d\u2019\u00c9cologie Microbienne, UMR CNRS 5557, UMR INRAE 1418, VetAgro Sup, Research Team \u201cBacterial Opportunistic Pathogens and Environment\u201d (BPOE), Marcy L\u2019\u00c9toile, 69280"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2280-243X","authenticated-orcid":false,"given":"Quentin","family":"Jossart","sequence":"additional","affiliation":[{"name":"Universit\u00e9 Bourgogne Europe, CNRS 7 , ,","place":["Dijon, France, 21000"],"department":["Bioge\u00f3sciences, UMR"]},{"name":"Universit\u00e9 Libre de Bruxelles 10 , ,","place":["Brussels, Belgium, B-1050"]}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Elie","family":"Poulin","sequence":"additional","affiliation":[{"name":"Universidad de Chile 1 , ,","place":["Santiago, Chile, 7800003"],"department":["Laboratorio de Ecolog\u00eda Molecular, Departamento de Ciencias Ecol\u00f3gicas, Facultad de Ciencias"]},{"name":"Instituto Milenio Biodiversidad de Ecosistemas Ant\u00e1rticos y Subant\u00e1rticos 2 , ,","place":["Santiago, Chile, 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