Program REVOLTA (Ressources Ecologiques et Valorisation par un Observatoire à Long terme en Terre Adélie)
Fassio G., Modica M.V., Alvaro M.C., Buge B., Salvi D., Oliverio M. & Schiaparelli S. 2019. An Antarctic flock under the Thorson's rule: Diversity and larval development of Antarctic Velutinidae (Mollusca: Gastropoda). Molecular Phylogenetics and Evolution 132: 1-13. DOI:10.1016/j.ympev.2018.11.017
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.
Accessible surveys cited (5) [+] [-]
D'udekem d'acoz C. & Verheye M.L. 2017. Epimeria of the Southern Ocean with notes on their relatives (Crustacea, Amphipoda, Eusiroidea). European Journal of Taxonomy 359: 1-553. DOI:10.5852/ejt.2017.359
Accessible surveys cited (4) [+] [-]
D'udekem d'acoz C., Schön I. & Robert H. 2018. The genus Charcotia Chevreux, 1906 in the Southern Ocean, with the description of a new species (Crustacea, Amphipoda, Lysianassoidea). Belgian Journal of Zoology 148(1): 31-82. DOI:10.26496/bjz.2018.18
Abstract [+] [-]It is demonstrated here that Charcotia Chevreux, 1906 (Amphipoda) has priority over Charcotia Vayssière, 1906 (Gastropoda), and that Waldeckia Chevreux, 1906 has to be treated as an invalid objective junior synonym of Charcotia Chevreux, 1906. An analysis of a part of the mitochondrial COI gene of Charcotia indicates that Charcotia obesa sensu lato, consists of two genetically distant clades that fulﬁl the criteria of genetic species. Each genetic clade corresponds to a different morphotype. The ﬁrst one has a low triangular protrusion on the dorsal border of urosomite 1, a strong tooth on epimeron 3, and the posterodistal corner of the basis of pereiopod 7 is regularly rounded. It agrees with the original description of Charcotia obesa Chevreux, 1906. The second one has a protrusion of urosomite 1 prolongated by a sharp and usually long denticle, a small tooth on epimeron 3, and the posterodistal corner of the basis of pereiopod 7 is bluntly angular. The second form is treated herein as a new species, Charcotia amundseni sp. nov., which is described in detail. While the bathymetric distribution of the two Antarctic Charcotia species overlaps (0–300 m for C. obesa and 7–1200 m for C. amundseni sp. nov.), C. obesa largely predominates at depths of less than 150 m, while Charcotia amundseni sp. nov. predominates at greater depths. Both species are widely distributed and presumably circum-Antarctic.
Accessible surveys cited (3) [+] [-]
Verheye M.L., Martin P., Backeljau T. & D'udekem d'acoz C. 2016. DNA analyses reveal abundant homoplasy in taxonomically important morphological characters of Eusiroidea (Crustacea, Amphipoda). Zoologica Scripta 45(3): 300-321. DOI:10.1111/zsc.12153
Accessible surveys cited (2) [+] [-]
Verheye M.L., Backeljau T. & D’udekem d’acoz C. 2016. Looking beneath the tip of the iceberg: diversification of the genus Epimeria on the Antarctic shelf (Crustacea, Amphipoda). Polar Biology 39(5): 925-945. DOI:10.1007/s00300-016-1910-5
Accessible surveys cited (4) [+] [-]