The concept of Compsoneuria Eaton, 1881 revisited in light of historical and new material from the Sunda Islands (Ephemeroptera: Heptageniidae: Ecdyonurinae) Author Sartori, Michel text Zootaxa 2014 3835 1 1 32 journal article http://dx.doi.org/10.11646/zootaxa.3835.1.1 7d11dc81-2b61-40fb-8eb1-fcdfb1547668 1175-5326 286701 5BBF2D80-F682-49E7-9B32-64E75ACAA6CF Compsoneuriella sp. 1 Compsoneuria thienemanni Boonsoong & Braasch, 2013 , Zookeys 272 , p. 75 (nymph) ? Compsoneuria thienemanni Braasch & Soldán, 1986 , Reichenbachia 24 ( 3 ), p. 41 (adult, nymph) Material examined. 2 nymphs, Thailand , Chiangmai Province, near Hot, Mae Nam Chaem, 200 m . , 18 ° 12 ’ 07.54’’ N , 98 ° 36 ’ 32.85 ’’ E , IV. 2003 , D. Braasch leg. [ MZL ] Discussion. The Thai material differs from C. thienemanni by the following characters: maxilla with 8–9 comb-shape setae on the crown, instead of 12 in C. thienemanni ; glossae ( Fig. 68 ) of the labium more conical, dorsal face with two spines instead of one; bristles on the upper face of femora clearly pointed ( Fig. 69 ), posterior margin of the abdominal tergites without rows of microdenticles ( Fig. 70 ), apex of gill VII clearly pointed instead of rounded. As in C. thienemanni , the tarsal claw bears no subapical teeth. The Vietnamese material present similar characters, but in the absence of material in hand, it cannot be ascertained that both populations belong to the same species. Anyway, this Thai species needs to be redescribed and named on the basis of a much more abundant material than covered here (Boonsoong & Sartori, in prep.).