Synorthocladius Thienemann, 1935: emended generic diagnosis

Lencioni, Valeria & Moubayed, Joel, 2021, Synorthocladius federicoi sp. nov., a new species occurring in the middle basin of the Adige River, northern Italy (Diptera, Chironomidae, Orthocladiinae), ZooKeys 1057, pp. 105-116 : 105

Genus Synorthocladius Thienemann, 1935: emended generic diagnosis

Remarks.

The generic diagnosis of Synorthocladius in Thienemann (1935), emended in Cranston et al. (1989) and Liu and Wang (2005), is here supplemented as follows. Head: Frontal tubercles present, circular or triangular; coronal triangle reduced or weakly developed; coronal setae present or absent; sensilla coeloconica on palpomere 3 present or absent. Antenna. Last flagellomere simply clubbed, or with bilobed or truncate apex; antennal ratio between 0.5 and 1.0. Thorax: Acrostichals 0-3, or about 9; scutellum with 2 or 4-6 setae; sensilla chaetica present on tibiae and tarsomeres ta1-ta5 of PI-PII, absent on tarsomeres of PIII. Abdomen: Tergite IX with or without a dorsal hump; anal point slightly to strongly curved upwards. Gonocoxite generally with slender dorsal and ventral inner margin, distinctly broad at base. Virga absent or well developed. Superior volsella flat or broadly swollen. Apex of inferior volsella single or double, long nose-like, lobe-like or truncate, subtriangular or spherical. Gonostylus generally slender to well developed, or atypically globular or bean-shaped as in the new species.