Chasmacryptum Becker, 1907

Li, Zhu, Yang, Ding & Murphy, William L., 2019, Review of genera of Sciomyzidae (Diptera: Acalyptratae) from China, with new records, synonyms, and notes on distribution, Zootaxa 4656 (1), pp. 71-98 : 80

6. Chasmacryptum Becker, 1907

( Figs. 15 , 29 , 41–42 , 65 )

Chasmacryptum Becker, 1907: 261 . Type species: Chasmacryptum seriatimpunctatum Becker, 1907 (monotypy). Pseudopherbina Elberg, 1965: 192 . Type species: Pseudopherbina loewi Elberg, 1965 (monotypy).

Diagnosis. Relatively small species, about 5 mm. Body mainly yellow. Body color and external characters similar to most species of genus Tetanocera , but wing with black spots and male sternites 4 and 5 densely covered with short setae. Frontal vitta reaching foremargin of frons. One pair of ocellar setae and 2 pairs of scutellar setae present. Prosternum setulose.

Remarks. As one of 21 monotypic genera in the family Sciomyzidae , Chasmacryptum comprises only 1 described species, Chasmacryptum seriatimpunctatum Becker, 1907 ; he described both sexes from Bomyn (Bomi County), Tibet, China. The species is restricted to the Palearctic Region.

During our study we found 6 specimens of C. seriatimpunctatum : 1 male from Heilongjiang, 3 males and 1 female from Qinghai, and 1 female from Inner Mongolia, all collection sites being in the Palearctic Region of China, which is consistent with the known distribution of the genus in the Eastern Hemisphere.

Figures

FIGURE 65. Geographical distribution of genera of Sciomyzidae from China (1).

FIGURES 9–16. Characters and morphological terms for the family Sciomyzidae (II).

FIGURES 25–32. Characters and morphological terms of the family Sciomyzidae (IV).

FIGURES 41–48. Adult habitus of genera in the tribe Tetanocerini (I).