Heptageniidae (Insecta, Ephemeroptera) of Thailand Author Boonsoong, Boonsatien Author Braasch, Dietrich text ZooKeys 2013 272 61 93 http://dx.doi.org/10.3897/zookeys.272.3638 journal article http://dx.doi.org/10.3897/zookeys.272.3638 1313-2970-272-61 Genus Thalerosphyrus Eaton, 1881 Figs 3 B-D6C-D Remarks. Thalerosphyrus occurs from China through Southeast Asia to India. This genus is originally described from tropical Southeast Asia. Thalerosphyrus sinuosus Navas , 1933seems to be widely distributed in Thailand and adjacent countries ( Nguyen and Bae 2004b ). Larvae of Thalerosphyrus are usually the dominant heptageniids in Thai streams as well as those of Afronurus . Figure 3. A Right side of thorax of Afronurus namnaoensis Braasch & Boonsoong, 2010 B-D right side of thorax (B), ventral view of head capsule (C) and ventral view of posterior abdomen (D) of Thalerosphyrus sinuosus Navas , 1933 E-H lamella of gills 3 (E), 4 (F), 5 (G), 6 (H) of Compsoneuria (Siamoneuria) kovaci Braasch, 2006 I-J dorsal view of abdomen (I), lamella of gills 7 (J) of Compsoneuria thienemanni Ulmer, 1939 K-L dorsal view of abdomen (K), lamella of gills 7 (L) of Compsoneuria langensis Braasch & Boonsoong, 2010.