Dolichopus partitus Melander & Brues, 1900

Runyon, Justin B., 2022, Nematode-induced demasculinization of Nearctic Dolichopodidae (Diptera) with five new synonyms, Zootaxa 5092 (5), pp. 545-558 : 547-548

Dolichopus partitus Melander & Brues, 1900

( Figs 10–12 , 16, 17 )

Dolichopus partitus Melander & Brues, 1900: 135 .

Nematode. Apparent Mermithidae .

Demasculinized male examined. 1 ♂, USA, Montana, Granite County, Copper Creek , wetland, N46.06099° W113.55637°, 22 July 2020, JB Runyon ( MTEC) .

Remarks. The demasculinized specimen has small, very poorly rotated genitalia with darker cerci (cf. Figs 16, 17 ), a wider face (cf. Figs 10, 11 ), pterostigma absent, and with the long ventral ciliation of hind femora greatly reduced. The infected specimen was collected with a normal male of D. partitus in a sedge-dominated boggy wetland with scattered willows.

Figures

FIGURES 7–15. Effects of mermithid-like nematode infection on faces of male Dolichopus species. Normal males (left column), infected males (middle column), and females (right column). 7–9. Dolichopus dorycerus Loew. 10–12. Dolichopus partitus Melander & Brues. 13–15. Dolichopus sincerus Melander.

FIGURES 16–19. Comparison of normal male of Dolichopus versus those infected by mermithid-like nematodes. 16. Habitus of normal Dolichopus partitus Melander & Brues. 17. Habitus of infected D. partitus. 18. Habitus of normal Dolichopus sincerus Melander. 19. Habitus of infected D. sincerus. Inset shows mermithid-like nematode removed from abdomen of D. sincerus.