Geostiba

• Main Author: Gusarov, Vladimir I.
• Format: Other/Unknown Material
• Language: unknown
• Published: 2002
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Insecta; Coleoptera; Staphylinidae; Geostiba; Canada; Newfoundland
• Online Access: https://zenodo.org/record/6277593; https://doi.org/10.5281/zenodo.6277593

15. Geostiba (s. str.) circellaris (Gravenhorst, 1806) (Figs. 21­23; Figs. 1­4 in Assing (2001)) Aleochara circellaris Gravenhorst, 1806: 155. Geostiba (s. str.) circellaris: Benick & Lohse 1974: 112. Geostiba circellaris: Muona 1984: 229. Geostiba (s. str.) circellaris: Assing 2001: 139. Material. CANADA: Newfoundland:,, S Newfoundland, Rencontre West [47.61 °N 56.69 °W] (Lindroth), 16.vi. 1949 (MZHF). Diagnosis. Geostiba circellaris can be distinguished from other Nearctic species of Geostiba by having large eyes (temple length to eye length ratio 1.6­1.9), pronotal pubescence of type VI, reduced wings, elytra shorter than pronotum (pronotum length to elytron length ratio 1.1), the presence of one medial carina on male abdominal tergum 7 in front of posterior margin, the shape of the aedeagus and spermatheca (Figs. 1­4 in Assing (2001), Figs. 21­23). In North America there is no native species closely related to G. circellaris. Geostiba circellaris is superficially similar to G. impressula in having pronotal pubescence of type VI but can be distinguished from the latter species by having tergum 7 with one medial carina in males and a different shape of spermatheca in females (Fig. 4 in Assing (2001), Figs. 316­317). Description. Length 2.3­2.8 mm. Body reddish brown to brownish black, in some specimens pronotum, elytra and abdominal segments 7­8 lighter, antennae reddish brown to dark brown, legs and mouthparts from brownish yellow to brown. Body parallel­sided. Head as wide as long, surface on disk with fine isodiametric microsculpture, puncturation very fine, distance between punctures equal to 2­4 times their diameter. Temple length to eye length ratio 1.6­1.9. Antennal article 2 longer than article 3, article 4 subquadrate, articles 5­10 transverse, last article longer than 9 and 10 combined. Pronotum as wide as long, width 0.43­0.53 mm, wider than head (pronotal width to head width ratio 1.2); surface on disk with fine isodiametric microsculpture, and fine puncturation, distance between punctures ...