Taxonomic analysis of the genital plates and associated structures in Ophiuroidea (Echinodermata) Author Stöhr, Sabine 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 Ophiocomina Koehler in Mortensen, 1920 Fig. 18 Type species Asterias nigra Abildgaard in O.F. Müller, 1789. Examined species Ophiocomina nigra . Oral GP Rounded rectangular with finger-like proximal lobe, thin. Articulates with oral shield with lobe at distolateral spurs, pair of oGP close together. Fig. 18. Ophiotomidae Paterson, 1985 . Ophiocomina nigra (Abildgaard in O.F. Müller, 1789), SEM, unless otherwise noted. A–B . abGP and adGP in situ (micro-CT). C . adGP and abGP at arm. D . adGP abradial aspect. E . abGP, lateral aspect. F . Radial shield, inner aspect. G . Oral GP in situ, bleached specimen, digital photo. H . oGPs at madreporite, inside disc view, micro-CT. I . Oral shield, internal aspect. J . Madreporite, inner aspect. K . Oral GPs. Scale bars: A–J =0.5 mm; K =0.1 mm. Adradial GP Bar-like, distal end widened, curved dorsalwards, articular structures two-pronged condylar processes, adradial one with round dorso-distal condyle bordered by ventral groove, abradial one articulates with abGP. Abradial GP Flat scoop-shaped, thin, proximally tapered, ventral edge convex, dorso-proximal half straight, dorso-distal half with concave articular structure. Adradial surface with distal pore. Oral shield Inner side flat, two lateral spurs at distal edge. Madreporite inner surface with raised middle part, large distal hole, opening to one side in a smaller hole (hydropore). Flat lateral inner portions with small pores. Radial shield Distal edge with one large and one smaller condyle, larger one bordered by dorsal ledge. Proximal to two condyles a conspicuous hole.