Acomoptera crispa, Kerr, Peter H., 2011

Kerr, Peter H., 2011, Six new species of Acomoptera from North America (Diptera, Mycetophilidae), ZooKeys 137, pp. 41-76 : 45-48

Acomoptera crispa sp. n. Figs 13

Type Material.

Holotype: ♂, "B.C., Hixon, 21.v.1966, E.D.A. Dyer" [53.420°, -122.595°] / "HOLOTYPE 11G483 ♂ Acomoptera crispa Kerr 2011" [red label]. Deposited in CNC, specimen glued directly to the pin, missing ultimate two right palpomeres, missing ultimate 10 (left) and 9 (right) antennal flagellomeres, missing all legs except mid left, both wings partially torn but complete; otherwise in fair condition. Specimen dissected, male genitalia preserved in DMHF, on card marked "11G483" pinned below specimen.

Diagnosis.

This species is most similar to Acomoptera vockerothi in having similarly-shaped gonostyli that feature a line of long, curved setae near the dorsal margin. Acomoptera crispa may be separated from Acomoptera vockerothi by the gonocoxites lacking a posteromedial denticulate ridge ventrally (Figs 2B, 3B). It is also distinguished by having a longer, narrower ventromedial gonostylus lobe, which is usually forked (Fig. 3E) and the outer dorsal lobe is broadly attached laterally (Figs 2D, 3 D–E).

Description.

Male. Body length: 6.0 mm. Wing length: 5.8 mm.

Coloration (Fig. 1). Head light brown; palpomeres yellow to yellowish brown. Antennal scape and pedicel yellow to yellowish brown, flagellomeres yellowish increasingly yellowish brown toward tip. Thorax yellowish brown; area of scutum bearing acrostichal and dorsocentral setae defined by darker coloration, scutum setae gold- or golden brown-colored. Mid leg becoming increasingly brown towards tarsi; coxae yellowish or cream-colored; femur yellowish, tibia yellowish brown, tarsi brown (other legs missing, but likely having similar coloration). Wing hyaline without markings, wing veins yellowish brown; haltere stem and knob yellow to light yellowish brown. Abdominal segments concolorous, yellowish brown, with scattered yellow and brown setae. Terminalia yellowish brown.

Head. Ocelli slightly raised; middle ocellus approx. same size as lateral ocelli; lateral ocellus located approx. width of ocellus or less from eye margin, separated from median ocellus by approx. twice its own diameter. Eyes with sparse, inconspicuous microsetae, which are approximately as long as width of facet. Antennal length probably approx. 4.0 mm (approx. 0.8 × length of abdomen). Palpus approx. 1.0 –1.25× width of head (anterior view); length of palpomeres 2 and 3 subequal; palpomere 4 approx. 4.5 × longer than wide; palpomere 5 approx. 10 × longer than wide, subequal to or longer than combined length of palpomeres 3 and 4.

Thorax. Antepronotum bearing setae; remaining thoracic sclerites bare. Wing venation similar to others in the genus (e.g., Acomoptera digitata sp. n., Fig. 8); costal vein extends beyond R5, approx. 0.25 × distance between R5 and M1; R1, R5, and M1, with at least some setae on lower surface.

Male Genitalia (Figs 2-3). Epandrium approx. 3 × wider than long (Fig. 3F). Gonocoxites with dorsomedial comb (Figs 3A, 3C). Gonostylus complex, as shown in Figs 2, 3 A–B, 3 D–E.

Female unknown.

Etymology.

The species epithet "crispa" is an adjective meaning curly in Latin, and refers to the long curved setae of the gonostylus.