A new, first fossil species of Ophioderma MHller and Troschel, 1842 (Echinodermata: Ophiuroidea) (Late Miocene, Argentina) Martínez, Sergio Del, Claudia J. Zootaxa 2008 1841 43 52 Muller and Troschel, 1842 Muller and Troschel 1842 [151,638,797,823] Ophiuroidea Ophiodermatidae Ophioderma Animalia Ophiurida 4 47 Echinodermata genus    Typespecies.  Asterias longicauda Retzius, 1805, by subsequent designation, Clark, 1915. Although the most conspicuous characteristic of the genus, i.e. the genital slits, are not visible, the presence of large disks with very small scales covered by granules, firmy fused subrounded arms, very short, flat, and addpressed arm spines, and two flat genital scales, lead us to include the fossils in  Ophioderma.