Asionurus primus Braasch & Soldan , 1986

Boonsoong, Boonsatien & Braasch, Dietrich, 2013, Heptageniidae (Insecta, Ephemeroptera) of Thailand, ZooKeys 272, pp. 61-93 : 76-77

Asionurus primus Braasch & Soldan, 1986 Figs 4 A–B7C–D 9B

Asionurus primus Braasch & Soldán, 1986a: 155-158, Figs 1-13. (orig.)

Larva.

Braasch and Soldán 1986a: 155-158, Figs 1-13.

Adult.

Braasch and Boonsoong 2010: 5-7, M, Figs 14-17; F, Fig. 18.

Eggs.

General shape ovoid, both poles with large KCTs densely arranged (Fig. 7C), many microgranules densely scattered all over the surface of the chorion, macrogranules on equatorial plane (Fig. 7D), border well-defined by a thickened rim beset with tubercles, 5-6 micropyles on equatorial plane.

Distribution.

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

Diagnosis.

Asionurus primus differs from Asionurus ulmeri ( Braasch and Soldán 1986a) by shorter and more pointed wings of hypopharynx and gill 7 with bulging anterior portion and acutely shaped apically. In Asionurus ulmeri the wings of hypopharynx are longer and have rounded ends whereas gill 7 is narrow and long and hardly extended anterioriorly.

Habitat and biology.

Asionurus primus larvae (Fig. 9B) are often the most abundant in small mountain streams of Thailand. Larvae live beneath rocks and debris. They were found together mostly with those of Notacanthurus baei . Larval habitat preference is similar to that of larvae of Notacanthurus baei .

Remarks.

Only one species of Asionurus ( Asionurus primus ) was identified from Thailand. The larva and adults of this species was described by Braasch and Soldán (1986a) and Braasch and Boonsoong (2010). The larva of this species found in small mountain streams of Thailand.