Gimnomera tibialis

• Main Authors: Chagnon, Marie-Eve, Sinclair, Bradley J.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2020
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Insecta; Diptera; Scathophagidae; Gimnomera; Gimnomera tibialis; Wrangel Island; Alaska
• Online Access: https://doi.org/10.5281/zenodo.4410887; http://treatment.plazi.org/id/038E87E5EF18FFC8CDFDFABBFDDC0A71

Gimnomera tibialis (Malloch) (Figs 13, 14, 19, 24, 28, 37) Dasypleuron tibialis Malloch, 1919: 79. Type locality: Collinson Point, Alaska, USA. Gimnomera tibialis : Vockeroth, 1965: 840 (new combination). Cochliarium sibiricum Engelmark, 1999: 164. Type locality: Wrangel Island, Russia (Ozerov 2019, new synonym). Gimnomera sibirica : Šifner, 2008: 134 (new combination). Diagnosis. This Holarctic species is characterized by its variable number of pre- and postsutural dorsocentral setae ranging from 2–4 and by the male terminalia with its tapered apical projection on the cercus, hatchet-shaped surstylus and teardrop-shaped pregonite with two setae. Other populations have rows of pale dorsocentral and acrostichal setulae and only a single postsutural dorsocentral seta. Gimnomera tibialis is similar in appearance to the Nearctic species G. aquilonia , G. cuneiventris and G. subvittata because of similarities in body colour, but can be distinguished by the greater number of dorsocentrals with one in G. cuneiventris and two in G. subvittata . Gimnomera tibialis can also be distinguished by the shape of the male cercus, which is cup-shaped in G. aquilonia triangularshaped with apical protrusions in G. cuneiventris and triangular-shaped with apical and lateral protrusions in G. subvittata . Redescription. Male. Body: Primarily brown to black; pleura brown toblack; scutum black; entire body dusted with white pruinosity. Head with face black and gena black, often with yellowish oval central patch in genal groove; genal width slightly less than 1⁄4 eye height; postgena black. Frontal vitta yellow-orange darken to black towards ocellar triangle; fronto-orbital plate black blending to yellow anteriorly; parafacial black to yellowish brown. Frontoorbital plate with 4 inclinate frontal setae and 1 proclinate, 2 lateroclinate orbital setae, 1 pair of strong lateroclinate ocellar setae, 1 pair of divergent postocellar setae; 1 long inclinate inner vertical seta, 1 long lateroclinate outer vertical seta. Gena with 1–2 ...