Naoto Sawada

Identification and morphological characteristics of a fingernail clam Sphaerium nucleus (Mollusca: Sphaeriidae) newly recorded from Japan

Sphaerium nucleus is a freshwater clam species of the family Sphaeriidae, distributed from Europe to Central Asia. Through morphological and genetic analyses of recently collected specimens, the present study reports the first occurrence of S. nucleus in eastern Hokkaido, Japan....