Platypalpus longus, Wang & Wang & Yang & Lin, 2024

Wang, Yuanyuan, Wang, Ning, Yang, Ding & Lin, Kejian, 2024, The genus Platypalpus Macquart (Diptera, Hybotidae, Tachydromiinae) from Inner Mongolia, China, with the description of four new species, ZooKeys 1198, pp. 87-99 : 87

Platypalpus longus sp. nov.

Figs 3 , 10-13

Diagnosis.

One pair of vt. First flagellomere, 4.9 times longer than wide. Arista 1/3 as long as first flagellomere. Mid femur apically with 3-4 outer av. Mid tibia with short pointed, apical spur, almost as long as tibia width.

Description.

Male (Fig. 3 ). Body length 2.4-3.0 mm, wing length 3.3-3.4 mm.

Head black with pale gray pollen. Eyes narrowly separated on face; frons distinctly wider than face. Hairs on head yellowish, bristles brownish. Ocellar tubercle with 2 oc and 2 short hairs. 1pair of vt. Antenna (Fig. 10 ) blackish; first flagellomere very long, 4.9 times longer than wide, with short blackish pubescence; arista rather short, blackish, 1/3 as long as first flagellomere, with very short blackish pubescence. Proboscis dark brown, 0.7 times as long as head height; palpus yellowish, with yellow hairs and bristles, distinctly longer than wide, nearly acute at tip.

Thorax black with thin pale gray pollen; mesonotum mostly subshiny. Sternopleuron with shiny spot. Hairs and bristles on thorax yellow; mesonotum with somewhat dense hairs, 6 rows of acr, narrowly separated with dc; 1 h, 2 long npl, 1 psa, 1 presc; 2 pairs of short sc (apical pair short, 1/3 as long as apical pair).

Legs yellow, but tarsomeres V mostly dark brown with yellow base. Hairs and bristles on legs yellowish. Fore femur slightly thickened, 1.3 times wider than hind femur; mid femur distinctly thickened, 2.1-2.2 times wider than hind femur. Mid femur with 2 rows of short spine-like blackish ventral bristles (pv distinctly longer than av), 3-4 short spine-like outer av at tip, without row of outer pv. Mid tibia with row of black ventral bristles, apical spurt short, acute (nearly as long as tibia width).

Wing hyaline, veins brownish; R4+5 and M nearly parallel; crossveins r-m and m-m slightly or distinctly separated. Squama yellow with pale hairs. Halter yellowish.

Abdomen blackish with pale gray pollen. Hairs and bristles on abdomen yellowish. Hypopygium (Figs 11-13 ): left epandrial lamella (Fig. 13 ) rather narrow, apically widely obtuse. Right epandrial lamella wide; right surstylus (Fig. 12 ) rather long, finger-like. Left cercus (Fig. 11 ) slightly thickened at base, blunt and narrow at tip; right cercus slightly shorter, with shallow depression on outer edge of middle part, slightly widened at tip.

Female. Unknown.

Type material.

Holotype: male, China, Inner Mongolia, Erdos, Dongsheng, 2006. VIII.7, Maoling Sheng (CAU). Paratypes: 5 males, same data as holotype (CAU).

Etymology.

The specific name refers to the long right surstylus.

Remarks.

The new species belongs to P. longicornis group. It is somewhat similar to P. longicornioides Chvála, 1972 from Europe but can be distinguished from the latter by the 6 rows of irregular acr which are separated narrowly from the dc. In P. longicornioides , the acr bristles are biserial, and widely separated from the dc ( Grootaert and Chvála 1992).

Figures

Figures 2 - 5. Habitus, lateral view 2 P. flavipilosus sp. nov., male (dissected) 3 P. longus sp. nov., male (dissected) 4 P. shengi sp. nov., male (dissected) 5 P. shuimogouanus sp. nov., male (dissected). Scale bars: 1 mm.

Figures 10 - 13. Platypalpus longus sp. nov., male 10 antenna 11 genitalia, dorsal view 12 right surstylus, lateral view 13 left epandrial lamella, lateral view. Scale bars: 0.2 mm.