Oreodytes alaskanus

• Main Authors: Fery, H., P. N, Alarie, Y.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2007
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Insecta; Coleoptera; Dytiscidae; Oreodytes; Oreodytes alaskanus; Yukon; Canada; Alaska
• Online Access: https://zenodo.org/record/5479083; https://doi.org/10.5281/zenodo.5479083

Key to species of the Oreodytes alaskanus -clade The following key to species is based in part on that given in LARSON et al. (2000: 453). Numbers with an asterisk (*) relate to figures in this work. 1 Male with median lobe in ventral view narrow and subparallel (Figs 7b, 9b); last but one visible sternum with hind margin straight, lacking a posteromedial lobe. Female with apex of last visible sternum not protruded, but deeply U-shaped in posterior view (Fig. 15). One Palaearctic and one Holarctic species.2 - Male with median lobe in ventral view broadened subapically and spoon-shaped (Figs 117E*, 117J*); last but one visible sternum with at least a small posteromedial lobe. Female with apex of last visible sternum distinctly protruded and lobed medially (Figs 117C*, 117H*). Nearctic species.3 2 Pronotum with posterior angles acute, but moderately produced. Protibia less strongly curved (Figs 11-12). Body shorter (TL: 4.7-5.3 mm). Male median lobe as in Figs 7 a-c. Species known from the Russian Far East, Alaska (USA), and the Yukon Territory (Canada). O. dauricus (MOTSCHULSKY) - Pronotum with posterior angles acute and strongly produced. Protibia strongly curved (Figs 13-14). Body longer (TL: 5.0- 5.7 mm). Male median lobe as in Figs 9a-c. Species known from Mongolia. O. shorti (SHAVERDO & FERY) 3 Male median lobe moderately broadened subapically, its maximum width less than two times its medial width (Fig. 117E*). Female elytron with subapical tooth obtuse, hind margin behind tooth forming an angle of much less than 90° with suture (Fig. 117A*, 117B*). Species known from southern Alaska, Alberta, and Washington. O. alaskanus (FALL) - Male median lobe strongly broadened subapically, its maximum width two or more times its medial width (Fig. 117J*). Apex of female elytra conjointly truncate, thus, hind margin of elytra and suture forming approximately a right angle (Fig. 117G*, 117H*); subapical tooth more or less right angled. Species known from the Rocky Mountains of western Alberta, south-eastern British ...