Dorsispina furcicornaria, a new geometrid species and new genus from Kazakhstan (Lepidoptera: Geometridae: Ennominae)

摘要

A new geometric! genus, Dorsispina, with the type species Dorsispina furcicornaria sp. n. (Lepi-doptera: Geometridae: Ennominae), is described and illustrated from the River Emba, western Kazakhstan. A single adult male was found in late September, flying rapidly in sunshine about two hours before sunset in a sandy riverside dune surrounded by chalk steppes. The species has several unique, diagnostic features not seen in other Palaearctic Geometridae, for instance a thorax with a Y-shaped sclerotisedextension and abdominal tergites 3-8 that are densely covered with sclerotised spines. Systematic position of Dorsispina within the Ennominae is uncertain; it is tentatively classified in the Ennominae tribe Boarmiini. Various abdominal sclerotisationsacross Ennominae taxa from the tribes Boarmiini (Biston Leach, [1815] 1830 and related genera), Wilemanini and Desertobini, are illustrated and their potential relationships are discussed.