Paradicranophorus sinus sp nov (Dicranophoridae, Monogononta) a new rotifer from Belgium, with remarks on some other species of the genus Paradicranophorus Wiszniewski, 1929 and description of Donneria gen. nov.

A new dicranophorid rotifer, Paradicranophorus sinus sp. nov., is described from periphyton originating from poikilohaline waters in Belgium. The main distinguishing taxonomic features of the new species are intramallei with supramanubria and a pair of preuncinal teeth. Taxonomic problems associated with the genus Paradicranophorus are briefly discussed. A new genus, Donneria, is proposed to accommodate Paradicranophorus sudzukii Donner, 1968. Information is presented on the trophi of P hudsoni (Glascott, 1893) and D. sudzukii (Donner, 1968). Encentrum brevifulcrum Dartnall, 1997 is synonymised with P sordidus Donner, 1968.