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 2014-07-09 3835 1 1 32 journal article 36817 10.11646/zootaxa.3835.1.1 7d11dc81-2b61-40fb-8eb1-fcdfb1547668 1175-5326 286701 5BBF2D80-F682-49E7-9B32-64E75ACAA6CF Compsoneuriella langensis ( Braasch & Boonsoong, 2010 ) comb. nov. Compsoneuria langensis Braasch & Boonsoong, 2010 , Zootaxa 2610, p. 7 (adult, nymph) Material examined. 2 nymphs , Thailand , Mae Hong Son Province , Soppong , Nam Lang River , 605 m ., 19° 34.447’ N , 98° 16.727’ E , 3–25. IV. 2003 , D. Braasch leg. [ MZL ] Discussion. The species has been adequately described by Braasch & Boonsoong (2010) , and differs from the two previous ones by its labrum less expended laterally ( Fig. 71 ), by the shape of the glossae, with inner margin regularly convex and outer margin slightly concave ( Fig. 72 ), the inner margin of the fore femora with a row of spines and fine and long setae, the presence of microdenticles on the posterior margin of the abdominal tergites, and by the presence of 2 subapical teeth on the tarsal claw. Contrary to what has been previously illustrated ( Braasch & Boonsoong 2010: Fig. 45 ), gill VII is not obtusely rounded but is apically narrowly pointed ( Fig. 73 ). Finally the overall body coloration and pattern is not as contrasted as in the previous species.