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Phyllodiaptomus wellekensae n. sp. is described from south India. In the female, the genital somite is dilated at the left proximal margin and armed with an extraordinarily large, somewhat curved, laterallydirected spine; the right genital spine is much smaller than the left one. The terminal claw of leg 5 has a secretory pore at its tip and a characteristic conveyor canal on its anterior surface. In the right male P5, the coxal plate is short and unique in shape. The basis is 1.3 times as long as wide, with a long, sinuous, hyahne lamella on its medial margin. The first exopodite segment is short and optuse at its outer distal comer. The second segment is rectangular and has a short, hyaline, spinous projection between the lateral spine and the terminal claw. The left P5 has a large, serrate, hyaline fan between its apical thumb and medial apical seta. P. tunguidus is redescribed based on material newly collected from three localities in China. Scanning electron micrographs are provided for the above two species and alSo for P. blanci (the type species of the genus) and P. annae. The taxonomic significance of a set of new characters observed in the four species is discussed, and the generic definition is expanded accordingly. The biogeography of Phyllodiaptomus is commented upon.

Phyllodiaptomus christineae n .sp . is described from Thailand . It stands out, in the male, by the shape and the armature of the second exopodite-segment of the right P5 and by the elongate apical process and ornamentation of the second exopodite-segment of the left P5 ; in the female, by the reduced lateral wings of the fifth pediger, and by the form of the genital somite . Together with P blanci, P tunguidus and P longipes, the new species constitutes the blanci-group, here raised to the level of a subgenus (Phyllodiaptomus s .s .) with representatives in Central Asia, China, Borneo and Thailand . A second subgenus (Ctenodiaptomus subgen . nov .) is created to accommodate the four Asian species of the annae-group .

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