Tetroxyrhina menglunensis Shi, Gaimari & Yang, 2017, sp. nov.
Creators: name: Shi, Li
name: Gaimari, Stephen D.
name: Yang, Ding
Publisher: name: Zenodo
Year: 2017
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Lauxaniidae
Tetroxyrhina
Tetroxyrhina menglunensis

description: Tetroxyrhina menglunensis sp. nov.
(Figs 13–16, 59–61)
Diagnosis. Frons with a blackish brown median stripe through rows of short setulae extending to ocellar triangle, and two brown stripes through fronto-orbital setae rows extending to inner vertical setae. Antenna yellow, except 1st flagellomere pale brown on apical 1/2, arista brown, pubescent. Tarsomeres 4–5 on all legs pale brown. Wing slightly darker brown along costal margin extending to M1, with a thin white margin between R2+3 and M1; a brown spot on each of crossveins r-m and dm-cu. Abdomen yellow, male tergites 1–5 each with a black posterior margin and tergite 6 with pale brown posterior margin.
Description. MALE. Body length 3.5–3.8 mm, wing length 3.4–3.6 mm.
Head (Figs. 59–60) yellow. Frons with a blackish brown median stripe through rows of short setulae extending to ocellar triangle and two brown stripes through fronto-orbital setae rows extending to inner vertical setae, with sparse short setulae on anterior 1/3; nearly 1.4 times longer than wide and parallel-sided; ocellar triangle grayish black; anterior fronto-orbital setae reclinate, likely shorter than posterior (note, broken off). Facial keel distinct on upper 1/2 between bases of antennae; gena about 2/3 height of eye, with wide brown stripe. Antenna yellow, except 1st flagellomere pale brown on apical 1/2, rounded apically, nearly 1.5 times longer than high; arista brown, pubescent. Orbito-antennal spot distinct, present as a black velvety round spot between eye and base of antenna. Proboscis mostly yellow except pale brown at tip, with yellow and blackish setulae; palpus yellow with black setulae.
Thorax (Figs. 59–60) brown, with sparse grayish white pruinosity. Mesonotum with narrow yellow dorsocentral vittae and narrow median vitta, all of which extend through otherwise brown scutellum; 0+3 dorsocentral setae, acrostichal setulae in 2 rows; prescutellar acrostichal seta shorter than 1st postsutural dorsocentral seta; anepisternum brown and katepisternum darker brown with grayish white pruinosity, a yellow triangular spot at base of katepisternal seta, and yellow stripe through suture between sclerites; 1 anepisternal seta, 1 katepisternal seta. Legs mostly yellow, except tarsomeres 4–5 pale brown. Fore femur with 5 posteroventral setae and 8 posterodorsal setae, fore tibia with 1 preapical anterodorsal seta and 1 short apicoventral seta. Mid tibia with 1 strong preapical anterodorsal seta, 1 strong apicoventral seta. Hind femur with 1 weak preapical anterodorsal seta and a row of weak anteroventral setae; hind tibia with 1 preapical anterodorsal seta and 1 short apicoventral seta. Wing (Fig. 61) slightly darker brown along costal margin extending to M1, a thin hyaline apical margin between R2+3 and M1; a brown spot on each of crossveins r-m and dm-cu; subcostal cell hyaline; costa with 2nd (between R1 and R2+3), 3rd (between R2+3 and R4+5) and 4th (between R4+5 and M1) sections in proportion of 9:1.5:1; crossvein rm at middle of discal cell; ultimate and penultimate sections of M 1 in proportion of 1:1.1; ultimate section of CuA1 about 1/7 of penultimate. Halter yellow except knob brown.
Abdomen (Fig. 59) yellow, male tergites 1–5 each with a black posterior margin and tergite 6 with pale brown posterior margin. Male genitalia (Figs 13–16): epandrium with a pair of short conical dorsoapical processes and short dorsal setae; surstylus with sparse setulae; hypandrium broad with a pair of tiny lateral concavities, not curved apically; phallus with a pair of long claviform sclerites, curved backward apically.
FEMALE. Unknown.
Type material. Holotype male (CAUC), CHINA, Yunnan Province: Menglun, No. 55 area, 920 m, 24. IV. 2007, Hui Dong. Paratype: 1 male (CAUC), CHINA, Yunnan Province: Menglun, No. 55 area (920 m), 24. IV. 2007, Wenliang Li.
Distribution. China (Yunnan).
Remarks. The new species is very similar to Tetroxyrhina submaculipennis (Malloch, 1927) from China (Taiwan) in the frons having a grayish brown median stripe and two lateral stripes, a pale dark spot on the upper part of the face below each antenna, crossveins r-m and dm-cu each with a distinct brown elliptical spot, and the epandrium having a pair of dorsoapical processes in lateral view. But it can be separated from the latter by the legs being mostly yellow except tarsomeres 4–5 being pale brown; the katepisternum being dark brown and having a yellow triangular spot at the base of the katepisternal seta; the male abdomen being yellow, with tergites 1–5 each having a black posterior margin and tergite 6 having a pale brown posterior margin; and the epandrium being broad and the surstylus indistinct with setulae in lateral view. In Tetr. submaculipennis, the legs including the coxae are testaceous yellow; the katepisternum is brown with a pale yellow band along the upper margin; male abdominal tergites 1–4 are almost entirely dark brown except for testaceous yellow lateral margins, and tergites 5–6 are testaceous yellow, each with a pair of brown spots sublaterally (paler and smaller on tergite 6); and the epandrium is slender and the surstylus is longer and incurved in lateral view.
Etymology. The new species is named after the type locality Menglun.
description: Published as part of Shi, Li, Gaimari, Stephen D. & Yang, Ding, 2017, Five new species of the genus Tetroxyrhina Hendel from China (Diptera, Lauxaniidae), pp. 246-280 in Zootaxa 4247 (3) on pages 254-256, DOI: 10.11646/zootaxa.4247.3.2, http://zenodo.org/record/438543