Compsoneuria thienemanni Ulmer, 1939

Boonsoong, Boonsatien & Braasch, Dietrich, 2013, Heptageniidae (Insecta, Ephemeroptera) of Thailand, ZooKeys 272, pp. 61-93 : 74-75

Compsoneuria thienemanni Ulmer, 1939 Figs 3 I–J7A–B 9C

Compsoneuria thienemanni Ulmer, 1939: 672, Figs 440-448, 449-454. (orig.)

Compsoneuria thienemanni Braasch & Soldán, 1986b: 46. (comb.)

Thalerosphyrus thienemanni Wang & McCafferty, 2004: 17. (comb.)

Larva.

Ulmer 1939: 672, Figs 440-448, 449-454; Braasch and Soldán 1986b: 42-46, Figs 14.1-14.14.

Adult.

Ulmer 1939: 564, M, Figs 145-149, 152; F, 151; Fs, 150; Braasch and Soldán 1986b: 42-44, M, Figs 5-9.

Eggs.

Chorionic surface characterized by granular matrix, large KCTs randomly scattered on entire egg surface (Fig. 7A), small micropyles visible on equatorial plane (Fig. 7B).

Distribution.

Mae Hong Son province, Chiang Mai province, Trat province.

Diagnosis.

Compsoneuria thienemanni is recognised by having gills 2-6 without emarginations and gill 7 leaf-like and pointed apically; pale dots and marks on abdomen as shown in Fig. 3I.

Habitat and biology.

Compsoneuria thienemanni larvae (Fig. 9C) are found abundantly in the large rivers at lower altitudes where it is encountered clinging to floating submerged water plants. A few male specimens of Compsoneuria thienemanni were found in the mountainous region of Mae Hong Son province.

Remarks.

The larva and adults of this species were described by Ulmer (1939) and Braasch and Soldán (1986b). The larvae of this species are found abundantly in the low-gradient streams and large rivers in Thailand.