Platycheirus occultus Goeldlin, Maibach and Speight 1990

• Main Authors: Prokhorov, A. V., Popov, G. V., Zaika, M. I.
• Format: Other/Unknown Material
• Language: unknown
• Published: Zenodo 2018
• Subjects: Biodiversity; Taxonomy; Animalia; Arthropoda; Insecta; Diptera; Syrphidae; Platycheirus; Platycheirus occultus; Faroe Islands
• Online Access: https://doi.org/10.5281/zenodo.6454813; http://treatment.plazi.org/id/03DA5217227AFFA9A98E15FBFCCBAB79

Platycheirus occultus Goeldlin, Maibach and Speight, 1990 (figs 15–18) Material examined. Ukraine. Kyiv Region: Irpin env., 50.51 N 30.27 E, edge of mixed forest along railway, 11.04.2017, 1 Ơ (A. Prokhorov). D i s t r i b u t i o n: Belarus, Britain, Czech Republic, Denmark (incl. the Faroe Islands), Finland, France, Germany, Hungary, Ireland, Italy (Apennines), Liechtenstein, Norway, Poland, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland; Azerbaidjan, Iran, Turkey (Holinka & Mazánek, 1997; Reemer, 2000; Jensen, 2001; De Groot et al., 2010; Tóth, 2011; Speight, 2017; Mielczarek, 2018); Ukraine (first record). Diagnosis. This species belongs to P. clypeatus group of species (Speight & Goeldlin de Tiefenau, 1990; Bartsh et al., 2009). This group can be recognized by the entirely black antenna, orange-brown markings on the abdominal tergites, facial prominence and upper mouth-edge projecting anteriorly no further than the frontal prominence, male fore tibiae widening progressively from base to apex (Speight & Goeldlin de Tiefenau, 1990). Male differs from similar species ( P. angustatus (Zetterstedt, 1843), P. europaeus Goeldlin, Maibach & Speight, 1990 and P. ramsarensis Goeldlin, Maibach & Speight, 1990) by the underside of the basotarsomere of the fore tarsus with a straight, pale central furrow, sometimes ending in a small round pit containing a black mark (fig. 18) (in P. angustatus , P. europaeus and P. ramsarensis the underside of the basotarsomere of the fore tarsus with a V-shaped pale furrow), the distal half of all segments of the fore tarsus without a brown/black maculae ventrally (fig. 18) (in the aforementioned species, the distal half of the segments 2–3 of the fore tarsus often with a brown/black maculae ventrally). From similar P. magadanensis Mutin, 1999 it differs by the pale furrow on the underside of the basotarsomere of the fore tarsus starting at its base and ending in a pit that is more readily visible than the furrow (in P. magadanensis , the underside of the ...