Parydra (Chaetoapnaea) arctica Clausen & Cook, 1971

Stuke, Jens-Hermann, 2025, Taxonomic and faunistic comments on European Parydra Stenhammar, 1844 (Diptera: Ephydridae) with new species from Finland and Jordan, Zootaxa 5686 (1), pp. 49-105 : 70

publication ID	https://doi.org/10.11646/zootaxa.5686.1.3
publication LSID	lsid:zoobank.org:pub:E9EB1E28-99C8-4641-B4F9-CC7FFD3FE6DE
DOI	https://doi.org/10.5281/zenodo.16987074
persistent identifier	https://treatment.plazi.org/id/03F38780-8352-FFF5-FF6F-FEE3C41DFBD3
treatment provided by	Plazi
scientific name	Parydra (Chaetoapnaea) arctica Clausen & Cook, 1971
status

Treatment

Parydra (Chaetoapnaea) arctica Clausen & Cook, 1971 View in CoL

( Figs. 2 View FIGURE 2 , 22 View FIGURES 22–25 , 30–33 View FIGURES 30–33 )

Parydra (Chaetoapnaea) arctica Clausen & Cook 1971: 69–71 View in CoL ; type-locality: „ Canada, NWT, Salmita Mines, 64°05'N., 111°15'W.“; holotype ♂ [CNC, Clausen & Cook 1971].

Material examined: CANADA: 1♂, 7.viii.1950, Northwest Territories, Cambridge Bay [69.116°N 105.059°W], paratype, leg. E. H. N. Smith GoogleMaps ; FINLAND: 1♂, without date, Esbo [60.195°N 24.767°E], leg. R. Frey GoogleMaps , coll. MZH; 1♀, without date, Torneå [65.8°N 24.1°E], leg. R. Frey, det. Zatwarnicki GoogleMaps , coll. MZH; 1♂, without date, Utsjoki [69.909°N 27.028°E], leg. R. Frey GoogleMaps , coll. MZH; 1♂, 21.vii.2020, Lapland, Kortteenniska e Torvinen [67.198°N 26.663°E] GoogleMaps ; NORWAY: 1♀, 20.vii.2004, Svartness [70.372°N 31.012°E], det. Zatwarnicki. GoogleMaps

Diagnosis: A small black legged Parydra with the face and frons strongly dusted, gena broad, a light brown haltere knob and without obvious wing markings is a good candidate for P. arctica . However, it is difficult to distinguish P. arctica from P. nigritarsis and P. kahanpaai . Males of P. arctica can be clearly distinguished by their terminalia. Especially the postgonite which is blunt and laterally pointed ( Fig. 30 View FIGURES 30–33 ) and examination of the male terminalia is recommended for reliable identification. The only known distinguishing character for females is that the tip of the frontal triangle is almost as densely dusted as the frontal vita.

Distribution in Europe: To date the only published European records are from Finland ( Krivosheina 2000), Norway ( Zatwarnicki & Andersen 2023) and Sweden ( Hellquvist et al. 2024). Outside of Europe this Holarctic species has been recorded from northern Canada ( Clausen & Cook 1971) and Siberia ( Krivosheina 1989, 1995).

Biology: Both records made by the author are from barely overgrown sections of the banks of small streams. Flight time based on the available records is from July to August.