Compsoneuriella langensis ( Braasch & Boonsoong, 2010 ) Braasch & Boonsoong, 2010

Sartori, Michel, 2014, The concept of Compsoneuria Eaton, 1881 revisited in light of historical and new material from the Sunda Islands (Ephemeroptera: Heptageniidae: Ecdyonurinae), Zootaxa 3835 (1), pp. 1-32 : 27

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.

Figures

FIGURES 68 – 77. Compsoneuriella spp, nymphal structures. Figs 68 - 70: Compsoneuriella sp. 1 from Thailand. Fig. 68: Outline of the labium (left side paraglossa only drawn); Fig. 69: Bristles on the upper face of hind femora; Fig. 70: Posterior margin of tergite IV. Figs 71 - 73: Compsoneuriella langensis. Fig. 71: Outline of the labrum; Fig. 72: Outline of the glossae; Fig. 73: Outline of gill VII. Figs 74 - 77: Compsoneuriella tagbanua. Fig. 74: Outline of the labrum; Fig. 75: Outline of the glossae; Fig. 76: Detail of the left mandible; Fig. 77: Scattered setae on the ventral side of the galea.

FIGURES 43 – 47. Nymphal maxillae details of Compsoneuria spectabilis. Fig. 43: SEM view of the dentisetae, proximal dentiseta in red, distal dentisetae in yellow, with first one fimbriate; Fig 44: Same view in optical microscope; Fig. 45: SEM view of fimbriate scattered setae on the ventral face of the galea; Fig. 46: Same view in optical microscope; Fig. 47: SEM view of the comb-shape setae on the crown of the galea; abbreviations: dp: proximal dentiseta, dd 1, first distal dentiseta, dd 2 second distal dentiseta.