Ophiocomina Koehler

Stöhr, Sabine, 2024, Taxonomic analysis of the genital plates and associated structures in Ophiuroidea (Echinodermata), European Journal of Taxonomy 933, pp. 1-98 : 40-42

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.

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.

Figures

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.