Refrathella struvei

Description. Medium-sized elongated and equivalve carapace, sub-rectangular outline in lateral view, arrowhead-shaped in dorsal view. Hmax at 1 / 3 anterior; Lmax at 1 / 3 dorsal; Wmax in the postero-ventral part (at ridge extremity). Straight hinge line and dorsal margin. Adductorial sulcus slightly anterior to mid-dorsal. Slightly convex ventral margin, posteriorly oblique. Well rounded and regularly convex anterior margin, forming an angle of about 120 ° with the dorsal margin. Slightly rounded posterior margin, more arched in its ventral part, forming an angle of about 120 ° with the dorsal margin. Anterior part of the carapace higher than the posterior one. Surface with very large reticles, except along the free margins of the carapace. Smooth and flattened free margins. Marked ridge in the ventral half of each valve, formed by two lines of large reticles. Ridge long of 5 / 6 of Lmax beginning at the anterior margin and becoming more prominent in its posterior part, thus forming lateral robust wings in dorsal view.

cf. 1967 Refrathella struvei nov. sp.; Becker: pl. I, figs. 1 – 9. cf. 2013 Refrathella struvei Becker; Maillet: 62, pl. VI, figs. 14 – 15. 2013 Refrathella sp. B., cf. R. struvei Becker; Maillet: 63, pl. VI, fig. 17. cf. 2013 Refrathella struvei Becker; Casier in Casier & Préat: 488, pl. II, fig. 15, pl. III, fig. 1.

Discussion. A Refrathella characterized by a larger carapace than R. struvei Becker, 1967 and a carina with thick ridges on each valve. Occurrence. Middle Givetian (Candás Fm, mbs A, B and C), Asturias (Peran-Perlora section).

Material. 8 specimens (5 V, 3 F).