Orientisargus, Zhang, 2012

Zhang, Junfeng, 2012, Orientisargidae fam. n., a new Jurassic family of Archisargoidea (Diptera, Brachycera), with review of Archisargidae from China, ZooKeys 238, pp. 57-76 : 58

Genus Orientisargus gen. n.

Type species.

Orientisargus illecebrosus sp. n.

Included species.

The type species only.

Derivation of name.

Latin, orient-, oriental, alluding to the origin of the fossils, and sargus, a common ending in archisargid genera (the masculine gender).

Diagnosis.

First antennal flagellomere conical. R2+3 arched medially, ending in C before wing tip, and far from R1 end. R4+5 ending beyond wing tip. Rs stem and bR4+5 short. Origin of Rs nearly at level of d base. Rs fork shifted distally of M fork. Crossvein r-m meeting R4+5 and M1+2, near to d base. Four medial veins present. Cells d and m3 narrow and long, the latter cell with long petiole. Section bM3+4 shorter than r-m. CuA and CuP subparallel, and cu cell (traditionally anal cell) wide open.

Remarks.

Usually, the generic diagnosis is covered by the familial diagnosis when the family comprises only one genus. Nevertheless, the familial diagnosis can be well defined based on the characteristics of its sister groups Archisargidae and Kovalevisargidae . In such case, a generic diagnosis is temporarily proposed but need to be revised when another new genus (or genera) within the new family has (have) been discovered.