Geostiba

• Main Author: Gusarov, Vladimir I.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2002
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Insecta; Coleoptera; Staphylinidae; Geostiba; Newfoundland
• Online Access: https://doi.org/10.5281/zenodo.6277593; http://treatment.plazi.org/id/5B50E916FFD4396F4D2DFA7AFBABFE84

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 ...