Copytus malumiani Echevarría, 1987

Coimbra, João Carlos, Bergue, Cristianini Trescastro & Ramos, Maria Inês Feijó, 2020, Is Copytus Skogsberg, 1939 (Crustacea: Ostracoda) a neocytherideid? With description of a new family and two new species, Zootaxa 4729 (2), pp. 177-194 : 184-185

Copytus malumiani Echevarría, 1987 .

Another small species (l = 0.64 mm) is Copytus malumiani Echevarría, 1987 , from the Miocene of Tierra del Fuego (southernmost Argentina). It resembles Copytus sp. by Zabert & Herbst (1977), from the Paraná Formation, Upper Miocene of Entre Ríos Province; Copytus sp. by Echevarría (1982), from the Carmen Silva Formation, Lower Miocene, Tierra del Fuego; and Copytus sp. by Kielbowicz (1988) from the Upper Oligocene to Lower Miocene of the Austral Basin, all in Argentina. These records are all of similar shape and ornament, but there is some degree of variation in the angularity of the anterior margin and in the roundness of the posterior one. Copytus sp. by Zabert & Herbst is not well preserved and smaller (l = 0.61 mm), and seems to be a subadult specimen, besides it was poorly and inversely described. Echevarría (1987) considered the specimens of Zabert & Herbst (1977), Echevarría (1982) and Kielbowicz (1988) as junior synonym of the new species Copytus malumiani Echevarría, 1987 . In a paper on Oligocene ostracods from Lago Cardiel (Santa Cruz Province, Argentina), Echevarría (1991) figured a partially damaged carapace attributed to C. malumiani , but it is much larger (l = 0.78 mm) and presents outline differences, with the anteroventral margin less protruded. In our opinion the species of Echevarría (1991) is somewhat similar to C. laevata in size and general external features, and is not co-specific with C. malumiani .

Copytus sp. 4804 and C. aff. malumiani Echevarría, 1987 were reported by Dingle & Majoran (2001, p. 380) from the Oligocene of boreholes in the Victoria Land Basin, Antarctica, while C. sp. 4628 was registered in the Early Miocene in the same study. The authors stated that C. sp. 4804 resembles C. aff. malumiani , but they figured only a LV in external lateral view of the first species (fig. 3D). Although internal features are unknown, the outline of C. sp. 4628 shows beyond doubt that it is a median length (l = 0.75 mm) species of Copytus .