"Morphological diversity and discrimination tools of the non-marine ostracod Cypridopsis silvestrii across temporal and spatial scales from Patagonia"

RAMOS L.; PEREZ, P.; COVIAGA, C.; SCHAWLB, A; ARIZTEGUI, D.; ALPERIN, M.I. ; CUSMINSKY, G.

ANAIS DA ACADEMIA BRASILEIRA DE CIENCIAS.

ACAD BRASILEIRA DE CIENCIAS

Lugar: Rio de Janeiro; Año: 2021 vol. 93 p. 1 - 21

0001-3765

Geometric morphometric methods are powerful tools to discriminate between related ostracods taxa as well as to study the relationship between their morphological variations, taxonomy and paleoecology. In this study,Here, we apply valve ne analysis to identify the non-marine ostracod Cypridopsis silvestrii and compare it iocypris whatleyi juveniles and Eucypris cecryphalium. We further investigate C. For Review Onlysilvestrii morphological variability throughout Argentinean Patagonia across different temporal and spatial scales. Morphological analyses allows the discrimination between the non-marine ostracod C. silvestrii and R. whatleyi juveniles, pointing out differences in the posterior valve area and surface ornamentation. Modern female specimens of C. silvestrii 23 sites located in a spatial transect (41 to 51 °S) exhibit extensive morphological lity,, in valve shape, size and surface ornamentation. on the basis of which Cypridopsis silvestrii exhibits an extensive morphological variability, and but the three inedthree morphotypes (acuminated, transitional, subtruncated) were determined nated, transitional, subtruncated). inhabit a broad range of environments, therefore they could not be clearly linked to a particular environmental factor. Multivariate analyses show that Nevertheless, acuminated and transitional shapes are not arranged in groups but the "subtruncated" morphotype, , which includes specimens previously described as E. cecryphalium, was found in five lakes from Southern Patagoniapreviously described as E. cecryphalium, seems to be associated with low water conductivity (372 µS as well as dominant cold (5 ºC) and windy (8.6 m s-1) climatic conditions. The fossil cluster which included nine cores spanning the last 15.6 kyr, only covers acuminated and transitional shapes, which may indicate that these lineages might be older than the subtruncated morphotype. In addition, mMorphological differences between reproduction modes suggest that parthenogenetic females exhibit de posterior margin more acuminate than sexual females. These new results set the ground for more precise ecological and paleoenhance the potential of ostracods as proxies for environmental studiesreconstructions in Patagonia., increase our understanding of morphological variations and set the ground for further taxonomic and/or molecular studies