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Revision of the Scopula cajanderi (Lepidoptera: Geometridae, Sterrhinae) species group with description of a new species

  • Pasi Sihvonen (a1)

The 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.

La révision du groupe d’espèces Scopula cajanderi (Hertz), un ensemble holarctique, est basée sur des caractères externes et des caractères génitaux. Le groupe comprend d’abord Scopula cajanderi (Hertz 1903 [pas 1904]) (= le taxon paléarctique Scopula elwesi sajanensis Prout, 1935, syn.nov., = le taxon paléarctique Scopula elwesi achlyoides Prout, 1935 syn.nov., = le taxon néarctique Scopula septentrionicola McDunnough, 1939 syn.nov.), qui devient donc une espèce holarctique; le groupe est formé aussi de Scopula mustangensis Yazaki, 1995 et de Scopula aegrefasciatasp.nov. Des lectotypes ont été désignés pour les espèces suivantes, décrites à partir de plusieurs spécimens et pour lesquelles il n’y a pas eu de choix d’holotype : S. cajanderi, Scopula anaitaria (Hertz) et S. elwesi achlyoides. La position systématique de S. elwesi elwesi Prout, 1922 au sein du genre Scopula demeure incertaine. On trouvera ici une clé d’identification des espèces, ainsi que des illustrations des adultes et des genitalia et la carte de répartition de chaque taxon. Un examen de la biogéographie de S. cajanderi permet de croire que les glaciations du Wisconsinien et du Sartan peuvent être en partir responsables de la discontinuité entre les populations de cette espèce.

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