Calostigma Shannon, 1927

Mengual, Ximo, Miranda, Gil Felipe G. & Thompson, F. Christian, 2018, Unraveling Ocyptamus and the Baccha legacy (Diptera: Syrphidae): redefinition of groups and new species descriptions, Zootaxa 4461 (1), pp. 1-44 : 8

Genus Calostigma Shannon, 1927 stat. rev.

Figs 62, 63 .

Calostigma Shannon, 1927: 8 , as a genus. Type species: Calostigma elnora Shannon, 1927 (original designation).

Callostigma Curran, 1930b: 8 . Misspelling.

Callistigma Hull, 1944a: 41 . Misspelling.

Ocyptamus elnora species group, in part. Thompson (1981).

Ocyptamus (Calostigma) . Mengual et al. (2012).

Ocyptamus elnora species group. Miranda et al. (2016).

Diagnosis. Shiny scutum with three narrow microtrichose vittae. Vein M1 straight, perpendicular to vein R4+5. Extensively bare wings. Narrow, linear alula. Oval abdomen with pale vittae.

Comments. This taxon is readily distinguished by the shiny scutum with distinct vittae, the straight M1 vein, and the distinct pairs of parallel vittae on the abdomen. Morphologically, it seems to be more closely related to Hybobathus , but this remains to be tested. This is a more restricted view of the group than the so-called O. elnora group by Thompson (1981), since the group of ‘…flies that have yellow scutella…’ are actually part of the O. lepidus group ( Miranda et al. 2016).

Species list (5): C. coreopsis ( Hull, 1944a) , C. elnora Shannon, 1927 , C. exigua ( Williston, 1888) , C. ornatipes ( Curran, 1927) , C. striata ( Walker, 1852) .

Figures

FIGURES 62–70. 62: Calostigma elnora Shannon [female, USNM], habitus, lateral view. 63: Calostigma elnora [female, INPA-DIP0000173], thorax and abdomen, dorsal view. 64: Ocyptamus zita (Curran) [female, ZFMK-DIP-00027133], head and thorax, dorsal view. 65: Ocyptamus neuralis (Curran) [female, CNC_Diptera209401], wing. 66: Ocyptamus sp., O. lepidus species group [female, INPA-DIP0000256], habitus, dorsal view. Scale = 3 mm. 67: Ocyptamus prenes (Curran) [female, INPA-DIP0000246], habitus without wings, dorsal view. Scale = 2 mm. 68: Ocyptamus obliquus (Curran) [female, INPA- DIP0000248], abdomen, dorsal view. 69: Ocyptamus zita [female, ZFMK-DIP-00027133], abdomen, dorsal view. 70: Ocyptamus sp., O. stenogaster species group [female, INPA-DIP001362], habitus, dorsal view. Scale = 2 mm.