Amphilepis Ljungman, 1867

Stöhr, Sabine, 2024, Taxonomic analysis of the genital plates and associated structures in Ophiuroidea (Echinodermata), European Journal of Taxonomy 933, pp. 1-98 : 56

Genus Amphilepis Ljungman , 186

Fig. 26

Type species

Amphiura norvegica Ljungman, 1865 .

Examined species

Amphilepis norvegica .

Oral GP

Not identified among small disc scales near oral shields.

Adradial GP

Bar-like, curved, proximal end tailfin-like broadened and pointed or rounded, abradial ventrolateral edge with fin-like process, distal end with adradial condyle, bordered by deep groove on abradial side, proximal to condyle a large round patch of almost imperforate stereom, edges extending disc-like from main plate.

Abradial GP

Thin, flat, half-circular with concave adradial edge, strongly convex abradial edge, straight adradial articular edge to adGP. Part of ventral disc, encircling small genital opening. About ⅔ of length of adGP.

Oral shields

Inner side flat, with horizontal ridge across middle. Madreporite with large oval opening in centre.

Radial shield

Inner side with distal large domed condyle, bordered by curved, wide distal ledge, proximal to condyle an oval, almost imperforate patch.

Figures

Fig. 26. Amphilepididae Matsumoto, 1915, Amphilepis norvegica (Ljungman, 1865), SEM, unless otherwise noted. A–B. Micro-CT. A. Genital plates in situ, external aspect. B. Genital plates in situ, internal aspect. C. adGP, ventral aspect. D. adGP, dorsal aspect. E. abGP, ventral aspect. F. abGP, dorsal aspect. G. Radial shield, inner aspect. H. Oral shield, inner aspect. I. Madreporite, inner aspect. Scale bars: A–B, H–I = 0.1 mm; C–G =0.5 mm.