Heteropterna (Heteropterna s. str.) fanjingshana Wang et Huang, 2021

Wang, Qingyun, Qi, Lei, Wu, Hong & Huang, Junhao, 2021, Two new species of Heteropterna Skuse, 1888 (Diptera: Keroplatidae) from China, Zootaxa 4985 (2), pp. 277-284 : 281-283

Heteropterna (Heteropterna s. str.) fanjingshana Wang et Huang sp. n.

( Figs 3–4 )

Diagnosis. This new species is similar to H. septemtrionalis (Okada) by having similar antennae with the last four flagellomeres yellowish white. It can be recognized by the wing having medial hyaline spot oblique outward, and the internal lobe of gonostylus apically straight in ventral view ( Figs 4g, i–k ). In H. septemtrionalis , the wing has a medial hyaline spot oblique inward, and the internal lobe of gonostylus apically hooked in ventral view ( Matile, 1990: Figs 586–587).

Type material. Holotype. Male, CHINA: Guizhou Province, Mt. Fanjing (27.95° N, 108.77° E), 840 m, 5.VI.2020, coll. Zhenghai Yang, slide no. FJS-10-28.

Description. Male ( Fig. 3 ). Body length (without antennae) 5.3 mm. Wing length 3.4 mm. Length of terminalia 0.5 mm.

Head ( Figs 4a–b ) dark brown. Compound eyes ( Fig. 4a ) hemispheric, making up most area of head, covered with dense pubescence superficially. Three ocelli ( Fig. 4b ) lying between upper edges of eyes, arranged in an inverted triangle, with median ocellus at a slightly lower position, lateral ocelli about three times as median one in diameter. Mouthparts ( Fig. 4a ) reduced, palpus two-segmented and setose, labrum ligulate, labellum has bushy setae laterally.Antenna ( Fig. 4c ) pectinate and laterally compressed, about 1.5 times length of head width; scape and pedicel subtrapezoid, with setae dorsally and ventrally; flagellum 14-segmented and comb-like, covered with serried microtrichia laterally, with countable setae dorsally and ventrally; flagellomeres 1–10 brown (except 7th segment yellowish white laterally), flagellomeres 11–14 yellowish white, with last segment pale brown terminally.

Thorax ( Figs 4d–f ) brown. Anepisternum dark brown and subtriangular, bare. Mesonotum brown; medial stripe dark brown, narrowly bandlike, reaching to posterior 2/5. Scutellum dark brown, subrectangular. Mediotergite yellowish brown and subtriangular, medial membrane inverted triangular. Laterotergite brown and subelliptical. Halter length 0.5 mm; stem translucent, with distal half bearing setae anteriorly; knob dark brown, oval.

Wing ( Fig. 4g ) pale brown, covered with thick microtrichia superficially, outer and posterior margin with short cilia. Fuscous stripe along costa, approaching to 2/7 width of wing, stretching from base to end of costa. Medial hyaline spot irregular extending from end of Sc outward to middle of R, apical hyaline spot extending from end of R 2+3 obliquely inward to bottom margin of stripe. Veins brown to dark brown, with two rows of microsetae on C, and a row of microsetae on R 1, R 2+3 and R 4+5. Vein C terminate at 2/5 of R 4+5 -M 1. M 1 and M 2 weaker than other veins, with M 1 ending at outer margin, and M 2 ending far from outer margin. CuA curved backward at midpoint. False vein next to CuA, with free end. Vein r-m degenerated.

Legs ( Fig. 3 ) yellowish white to dark brown. Hind leg dark brown, except femora yellowish white interiorly, with thick setae. Fore and mid legs damaged, only with fuscous coxae left.

Abdomen ( Fig. 4h ) brown, with dense setae dorso-ventrally. Tergites pale brown. Sternites dark brown, with paired suboval hyaline spots from sternites 2 to 4 on each segment.

Terminalia ( Figs 4i–k ) brown. Tergite 9 subtrapezoidal, shallowly concave at posterior margin. Cercus subtriangular, setose dorsally. Gonocoxites with posterior 1/3 weakly sclerotized along median line; posterior protuberance horn-shaped, covered with intensive setae ventrally. In ventral view external lobe of gonostylus finely digitate, obtuse terminally, slightly shorter than width of gonocoxite, with dense bristles outside; internal lobe of gonostylus horn-like, about 2/3 length of external lobe, with setae inside and long bristles outside. In lateral view dorsal lobe of gonostylus enlarged dorsad at middle, with thick setae superficially.

Female. Unknown.

Etymology. This species is named after Mt. Fanjing, the collection site of type specimen; noun in genitive case.

Figures

FIGURE 3. Male adult of Heteropterna (Heteropterna) fanjingshana sp. n., holotype, lateral view.

FIGURE 4. Heteropterna (Heteropterna) fanjingshana sp. n., holotype. a–b, head (a, frontal view; b, dorsal view), antennae removed; c, antenna; d–f, thorax (d, dorsal view; e, posterior view; f, lateral view); g, wing; h, ventral view of abdomen; i–k, terminalia (i, ventral view; j, dorsal view; k, lateral view). Slide No. FJS-10-28.