Flagellisargus (Changbingisargus), 2017

Zhang, Junfeng, 2017, New findings of Flagellisargus J Zhang, 2012 (Diptera, Brachycera, Archisargidae), with discussion of the placements of some controversial taxa, Deutsche Entomologische Zeitschrift 64 (2), pp. 111-122 : 111

Flagellisargus (Changbingisargus) subgen. n.

Type-species.

Flagellisargus (Changbingisargus) parvus sp. n. (by monotypy)

Included species.

The type species only.

Diagnosis.

Small-size archisargid flies (body excluding antenna and genitalia less than 5 mm long); antennal scape long; arista (or stylus) absent; fork of R4+5 shallow, distad of level of R2+3 end; R5 ending before wing tip; discal cell short and wide (nearly 2.3 times as long as wide).

Etymology.

From Chinese “changbing” (long scape), and sargus referring to the Recent genus Sargus .

Distribution.

Jurassic, China.

Remarks.

The subgenus Flagellisargus (Flagellisargus) stat. n. includes three known species: Flagellisargus (Flagellisargus) robustus J Zhang, 2012a, Flagellisargus (Flagellisargus) sinicus J Zhang, 2012a and Flagellisargus (Flagellisargus) venustus J Zhang, 2012a. Among them, the first and the third species are erected based on nearly complete male flies, the second one with head and abdomen missing. This known subgenus differs from Flagellisargus (Changbingisargus) subgen. n. in the following aspects: moderate-size archisargid flies (body excluding antenna and genitalia more than 9 mm long); antennal scape short; arista (or stylus) present; fork of R4+5 relatively deep, just at level of R2+3 end; R5 ending just at wing tip; discal cell narrow and long (nearly three times or more as long as wide).

Although the head and abdomen are missing, Flagellisargus (Flagellisargus) venustus demonstrates close similarities in wing venation to that of Flagellisargus (Flagellisargus) sinicus and Flagellisargus (Flagellisargus) robustus : fork of R4+5 relatively deep, just at level of R2+3 end; R5 ending at wing tip; discal cell narrow and long, nearly 3.5 times as long as wide (Fig. 3 A–C). Thus, Flagellisargus (Flagellisargus) venustus should be retained in Flagellisargus (Flagellisargus) rather than be assigned to Flagellisargus (Changbingisargus) subgen. n.