(24) Diploposthe laevis (Bloch, 1782) Jacobi, 1897 .

Report: Petrova (1978).

Hosts: Aythya ferina (L.), Aythya nyroca (Güldenstädt) .

Locality: Topolovgrad.

General distribution: Cosmopolitan (Singh 1959; Spasskaya 1966; McLaughlin & Burt 1979; Schmidt 1986; Nguyen Thi Ky 1986; Maksimova 1989; Alexander & McLaughlin 1997; Silveira & Amato 2008).