An Antarctic flock under the Thorson's rule: Diversity and larval development of Antarctic Velutinidae (Mollusca: Gastropoda)
Type | Article | ||||||||||||||||||||
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Date | 2019-03 | ||||||||||||||||||||
Language | English | ||||||||||||||||||||
Author(s) | Fassio Giulia1, Modica Maria Vittoria2, Alvaro Maria Chiara3, 4, Buge Barbara5, Salvi Daniele7, Oliverio Marco1, 6, Schiaparelli Stefano3, 4 | ||||||||||||||||||||
Affiliation(s) | 1 : Sapienza Univ Rome, Dept Biol & Biotechnol Charles Darwin, Zool Viale Univ 32, I-00185 Rome, Italy. 2 : Staz Zool Anton Dohrn, Dept Integrat Marine Ecol, I-80121 Naples, Italy. 3 : Univ Genoa, DiSTAV, Cso Europa 26, I-16132 Genoa, Italy. 4 : Italian Natl Antarct Museum, MNA, Sect Genoa, Viale Benedetto XV 5, I-16132 Genoa, Italy. 5 : Museum Natl Hist Nat, Direct Collect, 55,Rue Buffon, F-75005 Paris, France. 6 : Univ Aquila, Dept Hlth Life & Environm Sci, Laquila, Italy. 7 : Univ Porto, Ctr Invest Biodiversidade & Recursos Genet, CIBIO InBIO, Campus Agr Vairao, P-4485661 Vairao, Portugal. |
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Source | Molecular Phylogenetics And Evolution (1055-7903) (Academic Press Inc Elsevier Science), 2019-03 , Vol. 132 , P. 1-13 | ||||||||||||||||||||
DOI | 10.1016/j.ympev.2018.11.017 | ||||||||||||||||||||
WOS© Times Cited | 12 | ||||||||||||||||||||
Keyword(s) | Thorson's rule, Larval ecology, Integrative taxonomy, Antarctica, Gastropoda, Velutinidae | ||||||||||||||||||||
Abstract | In most marine gastropods, the duration of the larval phase is a key feature, strongly influencing species distribution and persistence. Antarctic lineages, in agreement with Thorson's rule, generally show a short pelagic developmental phase (or lack it completely), with very few exceptions. Among them is the ascidian-feeding gastropod family Velutinidae, a quite understudied group. Based on a multilocus (COI, 16S, 28S and ITS2) dataset for 182 specimens collected in Antarctica and other regions worldwide, we investigated the actual Antarctic velutinid diversity, inferred their larval development, tested species genetic connectivity and produced a first phylogenetic framework of the family. We identified 15 Antarctic Molecular Operational Taxonomic Units (MOTUs), some of which represented undescribed species, which show two different types of larval shell, indicating different duration of the Pelagic Larval Phase (PLD). Antarctic velutinids stand as an independent lineage, sister to the rest of the family, with extensive hidden diversity likely produced by rapid radiation. Our phylogenetic framework indicates that this Antarctic flock underwent repeated events of pelagic phase shortening, in agreement with Thorson's rule, yielding species with restricted geographic ranges. |
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