Thetidia 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 : 19

Key to Thetidia species of the Baikal region

1. Forewing: white discal spot present; antemedial transverse line wavy (rarely not pronounced). In male genitalia ( Figs. 33H, 33I ) socii significantly widened in base, slightly curved; uncus comparatively wide, its apices does not reach apices of socii; vinculum with moderately deep medial notch; aedeagus comparatively curved. In female genitalia ( Fig. 37C ) sterigma comparatively large, about 0.8 mm in length, without antero-medial hollow......................... T. smaragdaria (Fabricius, 1787)

- Forewing: discal spot absent; antemedial transverse line not wavy, angled in middle of discal cell. In male genitalia ( Figs. 33F, 33G) socii rather narrow, more curved than in T. smaragdaria , hook-shaped; uncus comparatively narrow, its tips more distal than tips of socii; vinculum with strongly deep medial notch; aedeagus slightly curved. In female genitalia ( Fig. 37B ) sterigma smaller than in T. smaragdaria , about 0.5 mm in length, with small antero-medial hollow.................................................................................................. T. chlorophyllaria (Hedemann, 1879)

Figures

FIGURE 33. Male genitalia of Siberian Geometrinae. A, B—Geometra papilionaria; C–E—Comibaena amoenaria; G, F— Thetidia chlorophyllaria; H, I—T. smaragdaria; J–L—Jodis lactearia; M–O—J. putata. A, D, F, H, J, N—genital segment; B, E, G, I, K, O—phallos; C, L, M—sternite A8. Scale bar—1 mm.

FIGURE 37. Female genitalia of Siberian Geometrinae. A—Geometra papilionaria; B—Thetidia chlorophyllaria; C—T. smaragdaria; D—Comibaena amoenaria; E—Hemistola chrysoprasaria; F, G—H. zimmermanni; H—Hemithea aestivaria. Scale bar—1 mm.