Cardiomya sp. 3, 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 : 15

Cardiomya sp. 3

Fig. 6 E–H

Cardiomya cleryana auct ., non d’Orbigny, 1842 – Machado et al. 2016: in part.

Material examined

BRAZIL – São Paulo state • [1i]; São Sebastião, Biota Araçá ; 23°49′20.1″ S, 45°24′10.3″ W; 20 m depth; 21 Mar. 2014; ZUEC-BIV 5128 .

Description

Shell small (length 6.2 mm; height 4.2 mm). Shell flank triangular, umbones blunt. Anterodorsal margin descending, anterior margin angulated, ventral margin rounded. Rostrum short, posteroventral sinuation shallow, posterodorsal margin slightly curved upwards, not extending much above the umbones. External sculpture of seven weak and incomplete radial ribs, which vanish towards ventral margin, followed by six complete ribs on the posterior half of the shell flank; rostrum with commarginal growth lines only.

Geographic distribution

Brazil, São Paulo state, off São Sebastião, 20 m.

Remarks

Part of the material identified by Machado et al. (2016) (ZUEC-BIV 5128) as C. cleryana , is here referred as Cardiomya sp. 3.

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.