Discradisca, Stenzel, 1964

Bitner, Maria Aleksandra & Logan, Alan, 2016, Recent Brachiopoda from the Mozambique-Madagascar area, western Indian Ocean, Zoosystema 38 (1), pp. 5-41 : 8

Discradisca sp.

( Fig. 2A )

MATERIAL EXAMINED. — South Madagascar. ATIMO VATAE, stn TP03, 1 specimen.

DEPTH RANGE. — 17- 21 m.

MEASUREMENTS. — Length 2.8 mm, 3.4 mm width.

REMARKS

The very limited material, represented by one specimen attached to the substrate, prevents identification to species level. The shell is thin, small, and subcircular in outline, with the apex situated subposteriorly. The external surface of the adult shell is covered with numerous, very indistinct ribs. A similar discinid with indistinct radial ornamentation was reported by d’Hondt (1987) from the Réunion Island region.

Subphylum CRANIIFORMEA Popov, Bassett, Holmer & Laurie, 1993 Class CRANIATA Williams, Carlson, Brunton, Holmer & Popov, 1996 Order CRANIIDA Waagen, 1885 Superfamily CRANIOIDEA Menke, 1828 Family CRANIIDAE Menke, 1828

Figures

FIG. 2. — A, Discradisca sp., South Madagascar, Bay of Galions, ATIMO VATAE, stn TP03, 17-21 m, dorsal view of complete specimen (IB-2013-28). B, C, Novocrania roseoradiata (Jackson, 1952), outer and inner views of dorsal valve (IB-2013-29), South Madagascar, S. Bay of Lokaro, ATIMO VATAE, stn TS09, 5-6 m. D-H, Novocrania sp., Mozambique Channel, Almirante Leite Bank, MAINBAZA, stn CC 3167, 228-230 m, dorsal valves (IB-2013-30-31); D, E, outer and inner views; F-H, inner view, and enlargement of posterior part to show muscle scars (G) and margin (H). A, D-H, SEM. Scale bars: A, 1 mm; B-G, 2 mm; H, 200 µm.