Abstract
A new species of Ophioderma Müller and Troschel, 1842 is described. The new species is the first fossil one of the genus, and the third ophiuroid described for the Tertiary of South America. It is characterized by its large size, proximal dorsal arm plates arched, entire or irregularly fragmented in two or three parts and lateral arm plates with four or five short, flat spines of similar length with a finger-like outline.
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