Taxonomic analysis of the genital plates and associated structures in Ophiuroidea (Echinodermata) Author Stöhr, Sabine 412800EB-AACE-4313-9810-61F89B740405 Swedish Museum of Natural History, Department of Zoology, Box 50007, 10405 Stockholm, Sweden. sabine.stohr@nrm.se text European Journal of Taxonomy 2024 2024-05-14 933 1 98 https://europeanjournaloftaxonomy.eu/index.php/ejt/article/download/2525/11335 journal article 10.5852/ejt.2024.933.2525 2118-9773 11198874 8F720F2B-BFBC-4CA1-BFF2-A2B8C7C8D3E1 Genus Ophiotypa Koehler, 1897 Fig. 21M–P Type species Ophiotypa simplex Koehler, 1897 . Examined species Ophiotypa simplex . Oral GP Absent. Adradial GP Cup-shaped convex, smaller than lateral arm plate to which it attaches. Articular structure a flat distal surface. Abradial GP Absent. Oral shields Not examined. Radial shield Single large plate above each arm base with two flat articular structures separated by a depression. Remarks Ophiotypa simplex is the only species in its genus and strongly paedomorphic. Its disc consists of few large plates. Pairs of radial shields appear to have been fused into a single large plate or are replaced by the radial primary plates functioning as radial shields, but individuals with a pair of plates on one or several radii have been observed (unpublished data, Stöhr & Martynov). The ventral disc is covered by the large oral shield, genital slits are not visible and the abGP appears to be absent.