Taxonomic revision of Cypridopsis silvestrii comb. nov. (Ostracoda, Crustacea) from Patagonia, Argentina with morphometric analysis of their intraspecific shape variability and sexual dimorphism

RAMOS, LORENA; CUSMINSKY, GABRIELA C; RAMOS, LORENA; CUSMINSKY, GABRIELA C; COVIAGA, CORINA; ALPERIN, MARTA; COVIAGA, CORINA; ALPERIN, MARTA; PEREZ, ALEJANDRA PATRICIA; LANCELOTTI, JULIO L.; PEREZ, ALEJANDRA PATRICIA; LANCELOTTI, JULIO L.

ZOOTAXA

MAGNOLIA PRESS

Lugar: Auckland; Año: 2019 vol. 4563 p. 83 - 102

1175-5326

In this study we redescribe an ostracod species belonging to the subfamily Cypridopsinae Kaufmann, 1900, sampled inseven localities of northern and southern Patagonia, Argentina. A new taxonomical combination is proposed, Cypridopsissilvestrii comb. nov., based on detailed description of females and the first descriptions of males. Cypridopsis silvestriioccurred on a wide geographical distribution range, from 40o to 48o S latitude, as well as broad environmental toleranceranges. We evaluated morphological variations in two populations of C. silvestrii from northern (El Toro lake) and south-ern (El Sello lake) Patagonia, with contrasting limnological conditions. El Toro is a small shallow lake with high salinitywaters and El Sello is a large deep lake with lower salinity. Based on morphometric analysis, our results showed intraspe-cific variation in valve shape and size between populations. Sexual dimorphism in El Toro population was identifiedthrough morphometric analyses. Additionally, comparison of valve outlines in living and subfossil individuals from ElToro lake allowed specimens previously described as juveniles of Eucypris fontana (Graf, 1931) to be identified as adultsof C. silvestrii comb. nov. The present contribution increases knowledge of the taxonomic identity, the ecological require-ments and the geographical distribution of C. silvestrii, and shows that morphometric analyses are a feasible and usefultool for exploring intraspecific shape differences and assisting in taxonomic identification. Furthermore, the results pre-sented herein provide tools for C. silvestrii identification in paleolimnological studies, and emphasize the usefulness ofstudying living representatives for clarification of the taxonomic status of species widely distributed in Quaternary sedi-ments.