A new, first fossil species of Ophioderma Mhller and Troschel, 1842 (Echinodermata: Ophiuroidea) (Late Miocene, Argentina)

A new species of Ophioderma Müller and Troschel, 1842 is described. The new species is the first fossil one of thegenus, and the third ophiuroid described for the Tertiary of South America. It is characterized by its large size, proximaldorsal arm plates arched, entire or irregularly fragmented in two or three parts and lateral arm plates with four or fiveshort, flat spines of similar length with a finger-like outline.Key words: Ophiuroidea, Ophioderma, new species, Miocene, Argentina.Fil: Martínez, Sergio. Universidad de la República; UruguayFil: del Río, Claudia Julia. Consejo Nacional de Investigaciones Científicas y Técnicas. Oficina de Coordinación Administrativa Parque Centenario. Museo Argentino de Ciencias Naturales "Bernardino Rivadavia"; Argentin