Cardiomya sp. 2, A. Adams, 1864

Lima, Tarcilla Carvalho De, Oliveira, Cléo Dilnei de Castro & Absalão, Ricardo Silva, 2020, Small, rare and little known: new records and species of Cardiomya (Bivalvia: Cuspidariidae) from Brazil, European Journal of Taxonomy 619, pp. 1-20 : 13-14

Cardiomya sp. 2

Fig. 6 C–D

Material examined

BRAZIL – Amapá state • [1v]; off Salinópolis ; 00°29′00″ S, 47°24′00″ W; 22 m depth; 15 Jun. 1971; GEOMAR III, stn 2533; CMPHRM 3668 .

Description

Shell small (length 5.8 mm; height 4.1 mm). Shell flank triangular, umbones blunt. Anterodorsal margin descending, anterior margin extended, ventral margin rounded, crenulated. Rostrum very short, posteroventral sinuation unobtrusive, posterodorsal margin slightly curved upwards, not extending much above the umbones. External sculpture of 17 radial ribs, many incomplete on the middle of the shell flank, followed by three strongest and most widely spaced complete radial ribs; rostrum with commarginal growth lines only.

Geographic distribution

Brazil, Amapá state, off Salinópolis, 22 m.

Figures

Fig. 6. A–B. Cardiomya sp. 1, CMPHRM 3681, left valve. A. External view. B. Hinge detail. — C–D. Cardiomya sp. 2, CMPHRM 3668,left valve. C. External view.D. Hinge detail. — E–H. Cardiomya sp. 3, ZUEC-BIV 5128. E–F. External view, left and right valve. G–H. Hinge detail. Scale bars = 1 mm.