Thalera species

Makhov, Ilya, 2023, Geometridae (Lepidoptera) of the Baikal region: identification keys and annotated catalogue with notes to DNA barcoding. Part 2. Archiearinae, Geometrinae, Sterrhinae, Zootaxa 5294 (1), pp. 1-120 : 20

Key to Thalera species of the Baikal region

1. Male genitalia: costal process of valva is more flat than in T. chlorosaria and moderately sclerotized ( Figs. 34I–34K ); female genitalia: medial sclerite of sterigma with slightly concave lateral margin (see everted sclerite from lateral view, Fig. 38C )................................................................................ T. fimbrialis (Scopoli, 1763)

- Male genitalia: costal process of valva is more strongly sclerotized and bent outwards ( Figs. 34L–34N , 35A ); female genitalia: medial sclerite of sterigma with straight lateral margin ( Fig. 38D )........................ T. chlorosaria Graeser, 1890

Figures

FIGURE 34. Male genitalia of Siberian Geometrinae. A–C—Hemistola chrysoprasaria; D–F—H. zimmermanni; G, H— Hemithea aestivaria; I–K—Thalera fimbrialis; L–N—T. chlorosaria. A, E, G, I, M—genital segment; B, F, H, J, N—phallos; B, F—vesica everted; K—valva, dorsal view; L—dorso-lateral view of genital segment. Scale bar—1 mm.

FIGURE 35. Male genitalia of Siberian Geometrinae. A—Thalera chlorosaria; B, C—Dyschloropsis impararia; D, E, H, I—Chlorissa viridata; F, G, J—C. obliterata. A, B, D, F—genital segment; C, E, G—phallos; H–J—sternite A8. Scale bar—1 mm.

FIGURE 38. Female genitalia of Siberian Geometrinae. A—Jodis lactearia; B—J. putata; C—Thalera fimbrialis; D—T. chlorosaria; E—Dyschloropsis impararia; F—Chlorissa viridata; G—C. obliterata. Scale bar—1 mm.