Drymeia pribilofensis (Malloch, 1919)

Savage, Jade & Sorokina, Vera S., 2021, Review of the North American fauna of Drymeia Meigen (Diptera, Muscidae) and evaluation of DNA barcodes for species-level identification in the genus, ZooKeys 1024, pp. 31-89 : 31

Drymeia pribilofensis (Malloch, 1919) Figs 4A , 5A , 8B

Eupogonomyia pribilofensis Malloch, 1921: 179.

Pogonomyia inaequalis Malloch, 1922: 81.

Type material examined.

Eupogonomyia pribilofensis - Holotype male labelled " St. Paul Isd. / Alaska / VI-21-20"; "Presented by/ G.D. Hanna / Collector"/ " HOLOTYPE / pribilifensis [red]"; " Eupogonomyia / Drymeia pribilofensis / Mall. Type" ( CAS) .

Other material examined.

More than 400 males and females from: Nearctic: Canada: Manitoba: Churchill ; Northwest Territories: Aklavik, Aulavik Nt. Pk. (Banks Island), Kidluit Bay, Mould Bay , Tuktoyaktuk ; Nunavut: Arviat [formerly Eskimo point], Bathurst Inlet, Cambridge Bay, Chesterfield, Coral Harbour, Frobisher Bay, Kugluktuk [formerly Coppermine], Landing Lake (7.5 km NW of Rankin Inlet), Naujaat [formerly Repulse Bay], Padlei, Williamson Lake ; Quebec: Inukjuak [formerly Port Harrison], Kangirsuk [formerly Payne Bay], Sugluk ; Yukon Territory: Herschel Island. Palaearctic: Russia: Taymyr Peninsula: Ary-Mas cordon, 90 km NW Khatanga, Dixon ; Yamalo-Nenez AO ; Chukotka AO: Wrangel Island ; Sakha Republic: Chokurdakh, Indigirka River ( BUIC, CNC, LEM, SZMN) .

Distribution.

Nearctic: Canada (Manitoba, Northwest Territories, Nunavut, Quebec, Yukon Territory), USA (Alaska). Palaearctic: Russia (W Siberia, Far East (Wrangel I. )) .

DNA Barcode.

BOLDBIN: BOLD:AAD7664 (BIN merge with several other species, see Fig. 25 ). See Suppl. material 1: Table S1 for GenBank accession numbers.

Remark.

Males of this species can be readily identified based on the combination of a reduced prealar, strongly projecting face (Fig. 4A ) and distinctive chaetotaxy of the mid femur but the females can be difficult to distinguish from those of D. setibasis and D. cantabrigensis (see key to females). All barcoded specimens of D. pribilofensis from our dataset clustered closest to one another on the neighbour-joining tree (Fig. 25 ) with a maximum intraspecific p-distance of 0.15% but the distance to D. cristata , one of the seven species found in the BOLD:AAD7664BIN merge was very low (min p-distance = 0.61%). We would therefore not recommend using COI to discriminate specimens of D. pribilofensis from those of other species in this BIN.

Figures

Figure 4. Male head, lateral view A D. pribilofensis B D. neoborealis C D. vockerothi D D. spinitarsis E D. glacialis F D. santamonicae G D. amnicola H D. minor. Scale bars: 0.5 mm.

Figure 5. Tarsomeres A D. pribilofensis, male fore tarsomeres 3 - 5 B D. spinitarsis, male mid tarsomere 1 C D. spinitarsis, female mid tarsomere 1 D D. quadrisetosa, male fore tarsomeres 1 - 5. Scale bars: 0.25 mm.

Figure 8. Female heads A D. spinitarsis B D. pribilofensis C D. setibasis. Scale bars: 0.5 mm.

Figure 25. Neighbour-joining tree based on p-distance of all COI sequences (> 550 bp) for which specimens were examined. Each terminal includes the species name, BOLD process ID number, country of collection, and Barcode Index Number. Red text indicates the presence of more than one named species grouped under a single BIN (BIN merge).