Morphological diagnoses of higher taxa in Ophiuroidea (Echinodermata) in support of a new classification Author Stöhr, Sabine Author Hugall, Andrew F. Author Thuy, Ben Author Martynov, Alexander text European Journal of Taxonomy 2018 2018-03-21 416 1 35 journal article 22339 10.5852/ejt.2018.416 2eebb037-4ab1-433c-a9f6-8fe319e9fda9 3806109 AD094812-5768-43E9-BCC2-9226E69F0820 Family Ophiomyxidae Ljungman, 1867 Synonym Ophiarachninae Matsumoto, 1915: 83 . Type genus Ophiomyxa Müller & Troschel, 1842 ( type species: O . pentagona ( Lamarck, 1816 )) . Other genera Neoplax Bell, 1884 , Ophiarachna Müller & Troschel, 1842 , Ophioconis Lütken, 1869 , Ophiostiba Matsumoto, 1915 , Ophiurochaeta Matsumoto, 1915 . Diagnosis Dorsal disc covered with granules or naked thickened skin, scales reduced in Ophiomyxa . Dental plate fragmented, sockets with flat borders, not penetrating. Ophiarachna with small ventral tooth cluster. Hyaline, large, flat, serrated teeth in Ophiomyxa and Ophioconis . Lateral arm plates reminiscent of an upside-down Y-shape. Arm spine articulation without sigmoidal fold. Arm spine articulations generally larger than in Ophiodermatidae and Ophiopezidae fam. nov. and in shallower notches or on same level as plate stereom ( Ophiomyxa ), of rounded shape with smooth stereom. Remarks Ophiomyxa has a specialized morphology with many reductions of the skeleton and is thus not typical for this family but the name has priority. Ophiocanopidae Mortensen, 1932 was synonymized with Ophiomyxidae by Stöhr et al. (2008) but Ophiocanops is now a member of Ophiacanthidae .