Morphological diagnoses of higher taxa in Ophiuroidea (Echinodermata) in support of a new classification Stöhr, Sabine Hugall, Andrew F. Thuy, Ben Martynov, Alexander European Journal of Taxonomy 2018 2018-03-21 416 1 35 Ljungman, 1867 Ljungman 1867 [627,849,1886,1912] Ophiuroidea Ophiodermatidae Animalia Ophiurida 13 14 Echinodermata family     Typegenus   Ophioderma Müller & Troschel, 1840( typespecies:  O. longicauda( Bruzelius, 1805)).   Other genera   BathypectinuraH.L. Clark, 1909b,  CryptopeltaH.L. Clark, 1909b,  DiopedermaH.L. Clark, 1913,  Ophiarachnella Ljungman, 1872,  Ophiochasma Grube, 1868,  OphiocormusH.L. Clark, 1915a,  OphiocryptusH.L. Clark, 1915b,  Ophiocypris Koehler, 1930,  Ophiomidas Koehler, 1904,  Ophiopsammus Lütken, 1869.    Diagnosis Dorsal disc covered with granules. Dental plate fragmented, with finely meshed stereom, tooth sockets as broadly oval, not penetrating depressions with swollen borders, small tooth cluster on ventral end. Lateral arm plate with two proximal spurs, visible on external and internal surface.Arm spine articulation with weak sigmoidal fold, sunken in notches of distal plate edge.    Remarks   Ophiarachnellais polyphyletic and requires revision. The typespecies  O. gorgonia Müller & Troschel, 1842, however, is a confirmed ophiodermatid ( O’Hara et al.2017).