New systematical approach to the Japanese planktonic rotatoria

Abstract

1. A new systematic approach to the Japanese planktonic Rotatoria was made based upon the studies of almost all Japanese species and also on several foreign ones, in treating some 30 taxonomic characters of both female and male. 2. Valid monogonont rotifers hitherto recorded from Japan are about 230 species belonging to some 60 genera. 3. So-called ’valid‘ taxonomic characters are different depending upon the grade of the categories. 4. Taxonomic criteria higher than the family should be taken from the characters of the male, on the contrary, those lower than the genus from those of the female. 5. Species newly established: Anuraeopsis fissa urawensis, A.f. donneri, A. fissa pejleri, Asplanchna priodonta sirakabana, Asplanchnella sieboldii urawensis, Brachionus quadridentatus urawensis, Encentroides nojirensis, Parencentropsis mitti, P. araii, Postclausa hyptopus kurti, Proalinopsis trisegmentum, Ploesoma lynceus lenticularoide, P. lynceus rotundus, Liliferotrocha urawensis, Proalides wulferti, Keratellaeopsis quadratatropica, Synchaeta neapolitanoides, S. okai, Trichotria tetractis remotiprojectis, etc.