Pisidium amnicum (O. F. Mueller , 1774)

Rassam, Hanane, Ghamizi, Mohamed, Benaissa, Hassan, Clewing, Catharina & Albrecht, Christian, 2021, The fingernail clams (Bivalvia: Veneroida: Sphaeriidae) of Morocco: Diversity, distribution and conservation status, Biodiversity Data Journal 9, pp. 73346-73346 : 73346

Pisidium amnicum (O. F. Mueller, 1774)

Ecological interactions

Native status

Autochtonous

Distribution

Palearctic. More common in the north of Europe than in the south. In Morocco, it was reported in the present study only from a reservoir outlet.

Notes

Shell dimensions: Mean length = 8.5 ± 1.5 mm; Mean height = 6.96 ± 1.24 mm.

Key features: Large size (up to 10 mm) and clearly marked striations on the shell, irregularly spaced and denser near the umbo. The umbo is not prominent, placed posteriorly (Fig. 9 b). The hinge plate is thick. C2 triangular with shorter C4, C3 is triangular and often bifurcated.

Remarks: Pisidium amnicum remains the largest representative of Pisidium and, thus, it is always easy to distinguish.