Ratsa Viidalepp & Kostjuk, 2021

Viidalepp, Jaan & Kostjuk, Igor, 2021, Taxonomic notes on two endemic geometrine genera from Middle Asia (Lepidoptera: Geometridae, Geometrinae), Zootaxa 5052 (1), pp. 137-144 : 141

Ratsa Viidalepp & Kostjuk , gen. nov.

Type species: Hierochthonia alexandraria Prout, 1912: 205 . Type locality: „Alexander Mountains”, now The Kyrgyzskiy Range in the Tian-Shan mountains.

Differential diagnosis: Both forewing and hindwing vivid green as in Hierochthonia and Xenochlorodes but without any white line except on fringe. Antennae bipectinate both in males and females of Ratsa alexandraria and R. petitaria but pectinations much shorter than in X. albicostaria . Venation ( Fig. 20 ): Forewing R 1 anastomosing with Sc and then confluent with R 2; R 2–M1 stalked; discal vein angulate, thin, M3 free. Hindwing with Sc free ( Fig. 20 ) (anastomosing with foremargin of discal cell in Hierochthonia and Xenochlorodes ). Male genitalia differing from those of Hierochthonia in many features (compare Figs 22 and 23 ).

Figures

FIGURES 17–21. Some morphological characters of Hissarica and Ratsa, gen. nov.. 17—male antennae of Hissarica postalbida; 18–antennae of Ratsa alexandraria (a—male, b—female); 19–female antennae comparison of Ratsa? petitaria (a) and Ratsa alexandraria (b); 20—wing venation of Ratsa alexandraria; 21—hindleg of Ratsa alexandraria. Scale bar, 17, 18, 21—1 mm, 19, 20—not in scale.

FIGURES 22–26. Genitalia structures of Hierochthonia, Ratsa, gen. nov. and Xenochlorodes. 22: Hierochthonia pulverata: 22a—male armature, 22b—aedeagus, 22c—VIII sternite, 22d—lateral view; 23–24: Ratsa alexandraria: 23a—male armature, 23b—aedeagus, 23c—VIII sternite, 23d—lateral view, 24a—female genitalia, lateral view, 24b—female genitalia, ventral view; 25—female genitalia of Ratsa? petitaria; 26—female genitalia of Xenochlorodes albicostaria. Scale bar, 1 mm.