Rhithrogeniella Ulmer, 1939

Boonsoong, Boonsatien & Braasch, Dietrich, 2013, Heptageniidae (Insecta, Ephemeroptera) of Thailand, ZooKeys 272, pp. 61-93 : 77

Genus Rhithrogeniella Ulmer, 1939 Figs 4C8 A–B 9E

Remarks.

Genus Rhithrogeniella is unique in having scaled caudal filaments with special arrangements of stout bristles and finer setae in the proximal portion; distal portion segments bear longer, stiffer setae and at articulations short bristles alternate with fine setae. These characters are similarly expressed in several Nixe spp. from Taiwan ( Kang and Yang 1994). In view of the similarity in egg structure Rhithrogeniella is recently often identified as Nixe Flowers, 1980. However, Ulmer(1939) published Rhithrogeniella ornata from Sundaland which clearly has priority over Nixe Flowers, 1980.