Didacna profundicola
From Wikipedia, the free encyclopedia
| Didacna profundicola | |
|---|---|
 | |
| Illustrations of a specimen initially identified as Cardium catillus and now attributed to D. profundicola (1887) | |
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Bivalvia |
| Order: | Cardiida |
| Family: | Cardiidae |
| Genus: | Didacna |
| Species: | D. profundicola |
| Binomial name | |
| Didacna profundicola Logvinenko & Starobogatov, 1966 | |
Didacna profundicola is a brackish-water bivalve mollusc of the family Cardiidae, the cockles. It has a trapezoidal, thin, white or pink-white shell, up to 10–15 mm (0.39–0.59 in) in length, with flattened ribs. The species is the deepest-dwelling bivalve of the Caspian Sea. It lives in the middle and southern parts of the sea at depths between 75 and 475 m (246–1,558 ft).
Didacna profundicola has a trapezoidal, thin, moderately convex shell, with a narrower anterior margin, 25–38 flattened radial ribs and a distinct rounded posterior ridge. The shell length is up to 10–15 mm (0.39–0.59 in), the height is up to 7–9 mm (0.28–0.35 in), and the convexity is up to 7 mm (0.28 in). The coloration is white or pink-white, with thin yellow-grey periostracum. The hinge consists of one cardinal tooth in both valves. The cardinal tooth of the left valve is distinctly curved towards the anterior margin.[1][2][3]
Distribution and ecology
Didacna profundicola is the deepest-dwelling bivalve of the Caspian Sea. It lives in the middle and southern parts of the sea at depths between 75 and 475 m (246–1,558 ft). The species may presumably reach a depth of around 500 m (1,600 ft) or even 700 m (2,300 ft).[2][4][5]
The species is only known from the modern (Holocene) fauna.[3][6]