Amblypsilopus gabonensis, Grichanov, 2022

Grichanov, Igor Ya., 2022, Six new species of Amblypsilopus Bigot (Diptera: Dolichopodidae: Sciapodinae) and a key to species of the Afrotropical mainland, European Journal of Taxonomy 789 (1), pp. 49-80 : 59-61

Amblypsilopus gabonensis sp. nov.

urn:lsid:zoobank.org:act:C17421EA-669F-4729-B699-5366CBFBC12E

Fig. 2

Diagnosis

Amblypsilopus gabonensis sp. nov. together with A. spiniscapus sp. nov. belong to the A. abruptus species group, differing from all other species of the group in the presence of dorsal bristles on the antennal scape. Male cercus of the new species is bilobate, whereas other Afrotropical species of the group have a simple cercus, either short or long and filiform, at least 2 times as long as epandrium. The new species is very close to A. spiniscapus sp. nov., differing distinctly by its fore basitarsus bearing simple hairs ( Fig. 2D ) and male cercus with differently shaped lobes ( Fig. 2E ). The male of Amblypsilopus spiniscapus sp. nov. has erect hooked hairs on the fore basitarsus ( Fig. 1C ).

Etymology

The species is named after the country of origin.

Material examined

Holotype GABON • ♂ (dried from ethanol and mounted on pin); Gamba , Ogoué Maritime; 2°42ʹ S, 10°01ʹ E; alt. 25 m; 8 Jul. 2002; Tchignoumba, Tobi, Ditona leg.; ZIN.

Additional material

GABON • 1 ♂ (damaged specimen in ethanol); same locality as for holotype; 3 Jun. 2002; Syssou, Ngoma and Moussavou leg.; ZIN .

Description

Male ( Fig. 2A )

Somewhat lightened due to long-term storage in ethanol. Similar to A. spiniscapus sp. nov. in all respects except as noted.

MEASUREMENTS. Body length 4.4 mm; antenna length 1.2 mm; wing length 3.8 mm; wing width 1.2 mm.

HEAD ( Fig. 2B ). Frons with 5 fine black vertical setae and 1 strong postvertical bristle; face at clypeus 2 times as wide as postpedicel; antenna ( Fig. 2C ) about as long as height of head; scape slightly widened, vase-like, with 3 strong dorsal bristles of different length, at most as long as scape; pedicel with ring of short bristles, with 1 strong dorsoapical bristle; postpedicel conoid, as long as high; arista-like stylus dorsoapical; length (mm) of scape, pedicel, postpedicel, stylus (segments 1 and 2), 0.08/0.07/0.09/0.04/0.91.

THORAX. Mesonotum with 2 strong dorsocentral bristles behind suture and 3 hair-like dorsocentrals anteriorly; 3 pairs of acrostichals decreasing in length anterior; scutellum with 2 strong bristles.

LEGS (discolored). With coxae and femora brown, tibiae and tarsi yellow to brownish; fore and mid coxae with white hairs and 2–4 white subapical bristles; hind coxa with 5 white setae of different lengths; all femora with double row of white ventral hairs on basal half or third, shorter than diameter of femur; fore and mid femur with 5 short black posteroventral subapical setae; fore tarsomeres 1–2 with ventral rows of microscopic white hairs along entire length ( Fig. 2D ); mid and hind tibiae with several short dorsal and ventral setae, each with 1–2 distinct anterodorsal bristles; hind tarsus simple with only segment 5 slightly thickened; femur, tibia and tarsomere (from first to fifth) length ratio (mm): fore leg: 1.09/1.2/0.71/0.28 /0.17/0.13/0.8, mid leg: 1.24/1.58/1.12/0.37/0.25/0.11/0.1, hind leg: 1.41/2.05/0.77/0.37/0.21/0.14/0.09.

WING. Ratio of parts of costa between R 2+3 and R 4+5 to those between R 4+5 and M 1, 2.1/1; ratio of crossvein dm-m to apical part of M 1+2 (fork-handle) to apical part of M 4, 0.51/0.59/0.26.

ABDOMEN. Unmodified segments combined 2 times as long as thorax; cercus ( Fig. 2E ) nearly as long as epandrium, bifurcated at middle, with unequal lobes; dorsal lobe broad, with short setae at apex; ventral lobe narrow, hooked, with row of 6 strong setae; surstylus flattened, projected, with 1 long and few short setae at apex; epandrial lobe small, with 1 long and 1 short apical setae; 1 short epandrial seta.

Female

Unknown.

Figures

Fig. 2. Amblypsilopus gabonensis sp. nov., holotype, ♂ (ZIN). A. Habitus. B. Head. C. Antenna.D. Fore tarsomeres 2–5, lateral view. E. Hypopygium after maceration, left lateral view.

Fig. 1. Amblypsilopus spiniscapus sp. nov., holotype, ♂ (ZMUK). A. Habitus. B. Antenna. C. Fore tarsus. D. Hind tarsus. E. Hypopygium after maceration, right lateral view.