Revision of the Scopula cajanderi (Lepidoptera: Geometridae, Sterrhinae) species group with description of a new species
AbstractThe Holarctic Scopula cajanderi (Herz) species group is revised on the basis of external and genitalic characters. The taxa included in the species group are Scopula cajanderi (Herz, 1903 [not 1904]) (= the Palaearctic Scopula elwesi sajanensis Prout, 1935 syn.nov., = the Palaearctic Scopula elwesi achlyoides Prout, 1935 syn.nov., = the Nearctic Scopula septentrionicola McDunnough, 1939 syn.nov.), thus making S. cajanderi Holarctic; Scopula mustangensis Yazaki, 1995; and Scopula aegrefasciatasp.nov. Lectotypes are designated for the following species which were described from more than one specimen without holotype designation: S. cajanderi, Scopula anaitaria (Herz, 1903), and S. e. achlyoides. The systematic position of Scopula elwesi elwesi Prout, 1922 within the genus Scopula is uncertain. A key to the species is presented with illustrations of the adults and genitalia, and a distribution map is presented for all taxa. An examination of the biogeography of S. cajanderi suggests that the Wisconsinan and Sartan glaciations may have played a part in the origin of the disjunct populations.