Compsoneuriella

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 : 26

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.).

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.