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A REVISION OF THE NORTH AMERICAN OPEROPHTERA (LEPIDOPTERA: GEOMETRIDAE)

  • James T. Troubridge (a1) and Sheila M. Fitzpatrick (a1)

Abstract

The North American members of the genus Operophtera Hübner (Lepidoptera: Geometridae) are revised to include three species: O. brumata (L.), O. bruceata (Hulst), and O. danbyi (Hulst). Operophtera occidentalis (Hulst) is now treated as a subspecies of O. bruceata. All species are illustrated and characters to distinguish the species are given. The most useful characters for separating O. brumata from O. bruceata include the following: (1) hindwing dorsal surface with discal dot, which is almost always visible on O. bruceata but absent from O. brumata; (2) forewing colour, which is grey-brown or light brown in O. bruceata but reddish-brown in O. brumata; (3) abdomen colour, which is golden-brown to brown in western O. bruceata but brown in O. brumata; and (4) the costa of the forewing ventral surface, which is usually golden-brown in O. bruceata but brown in O. brumata. The structure of the genitalia of these two species allows hybridization between O. bruceata males and O. brumata females, but not vice versa.Hypothesized species interrelationships between palaearctic and nearctic Operophtera are illustrated in a cladogram. Maps for the distribution of each species are also included.

Les membres nord américains du genre Operophtera Hübner (Lepidoptera : Geometridae) ont fait l’objet d’une révision pour y inclure trois espèces : O. brumata (L.), O. bruceata (Hulst), et O. danbyi (Hulst). Operophtera occidentalis (Hulst) est maintenant traité comme une sous-espèce de O. bruceata (Hulst). Cet article contient des illustrations de toutes les espèces et donne les caractères distinctifs de chacune. Les charactères les plus important servant à différencier O. brumata de O. bruceata sont : (1) un point discoïdal sur la face dorsale de l’aile postérieure, lequel est presque toujours visible sur O. bruceata mais absent sur O. brumata; (2) la couleur de l’aile antérieure, laquelle est grise-brune ou légèrement brune pour O. bruceata tandis que rousse-brune pour O. brumata, (3) la couleur de l’abdomen, laquelle est brune-dorée pour O. bruceata de l’ouest mais brune pour O. brumata, et (4) la marge antérieure de la face ventrale de l’aile antérieure, laquelle est généralement brune-dorée pour O. bruceata tandis que brune pour O. brumata. La structure génitale de ces deux espèces permet l’hybridation entre les mâles O. bruceata et les femelles O. brumata, mais non l’inverse.Des relations proposées entre les espèces des groupes paléarctiques et néarctiques Operophtera sont illustrées dans un diagramme phylogénique. Cet article comprend aussi des cartes de l’aire de distribution des espèces.

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References

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A REVISION OF THE NORTH AMERICAN OPEROPHTERA (LEPIDOPTERA: GEOMETRIDAE)

  • James T. Troubridge (a1) and Sheila M. Fitzpatrick (a1)

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