Alona kotovi sp. nov., a new species of Aloninae (Cladocera: Anomopoda Chydoridae) from South Vietnam

摘要

A new species of anomopod related to Alona quadrangularis (Cladocera: Anomopoda: Chydoridae) is described from streams in South Vietnam. Alona kotovi sp. nov. differs from the other species of Alona s. str. (the quadrangularis-group) by the morphologyof its postabdomen, labrum and thoracic limbs. The presence of a short spine at the end of the male postabdominal claw is unique to the new species. A. kotovi sp. nov. is well-distinguished from two other Old World species, A. quadrangularis and A. kolwezii, yet shares numerous similarities with South American A. yara. This is one more case of connection between South American and Australasian faunas of Chydoridae.