Tipula (Sivatipula) pianmaensis, Men, 2020

Men, Qiulei, 2020, Three new species of the subgenus Tipula (Sivatipula) from Yunnan and Tibet, China (Diptera: Tipulidae), with an updated key for Chinese species, Zoological Systematics 45 (1), pp. 59-68 : 60-63

Tipula (Sivatipula) pianmaensis sp. nov. ( Figs 1–15 )

Diagnosis. Body gray in general; thorax gray with three brownish-yellow stripes on prescutum, the median one divided by a broad gray vitta; antenna longer than body length; wing suffused with brownish-yellow, stigma light brown; abdomen brownish-yellow with brown lateral stripes, segments six and seven wholly black, hypopygium yellow, distinctly expanded; tergite nine with a pair of horn-shaped processes at posterior margin, ventral extension of tergite nine densely covered with small black teeth; inner gonostylus terminated into a long black beak; outer gonostylus Y-shaped.

Material examined. Holotype male, China, Yunnan, Lushui, Pianma , Gaoligongshan National Natural Reserve , 26°00'N, 98°37'E, 19 Jun 2019, leg. Qiulei Men. Paratype. 1 male, same data as holotype .

Description. Adult length (male, n =2): body 14.5–14.7 mm (not including antenna), wing 16.6–16.8 mm, antenna 16.4– 16.6 mm.

Head. Gray with rostrum darker in coloration laterally. Nasus black densely covered with black setae. Vertex gray, unpatterned ( Fig. 1 ). Head including vertex and rostrum densely covered with black setae. Antenna 12-segmented, significantly longer than body; scape gray, pedicel and first two flagellomeres yellow, rest flagellomeres brown, each flagellomere subequal in length, cylindrical, with black verticils. Palpus dark gray.

Thorax. Pronotum gray medially, darker in coloration laterally ( Fig. 2 ). Prescutum gray with three brownish-yellow stripes, the median one divided by a broad gray vitta ( Fig. 3 ). Scutum black with two gray triangular marks which are not connected to each other, scutellum and postnotum wholly gray ( Fig. 3 ). Pleuron entirely gray ( Fig. 2 ). Legs very slender, coxae and trochanters gray, femora gray basally and gradually changed into dark brown, tibiae and tarsi dark brown. Halter black. Wing brownish-yellow, cell sc darker than ground color, stigma light brown ( Fig. 4 ). Rs distinctly longer than R 3, petiole of cell m 1 subequal in length to m-m, 1/3 the length of discal cell ( Fig. 4 ).

Abdomen. Segments one to five brownish-yellow with black lateral stripes, segments six and seven wholly black, tergite eight yellow, sternite eight mostly black ( Fig. 5 ). Hypopygium yellow, distinctly enlarged ( Figs 5–7 ). Tergite nine slightly protruding medially at posterior margin, terminating in a pair of horn-shaped processes at lateral corners, a pair of biforked lobes from ventral side of tergite nine, densely covered with black teeth apically ( Figs 7–9). Outer gonostylus, narrowed, Yshaped, with a finger-shaped process medially with numerous small black teeth at apex ( Fig. 10). Inner gonostylus broad basally, terminating in a long black beak, a small obtuse lobe and two finger-shaped processes arising from its mesal region of outer surface ( Fig. 11). Sternite nine with a pair of small median processes which are densely covered with long setae ( Fig. 12). Adminiculum broad basally, gradually narrowed to apex ( Fig. 13).

Semen pump with compressor apodeme V-shaped ( Fig. 14). Posterior immovable apodeme consisting of a median arm which curved dorsally ( Fig. 15). Anterior immovable apodeme flattened. Aedeagus narrow, elongated, tubular, more than 5.0 times the length of semen pump ( Fig. 15).

Distribution. China (Yunnan).

Remarks. The new species is mostly similar to T. (S.) bhishma Alexander, 1964 , a species from Assam, India, by similar structure of hypopygium and body color. It can be easily distinguished from T. (S.) bhishma by the outer gonostylus which is Y-shaped with a finger-shaped process (absent in T. (S.) bhishma ). The latter species has its outer gonostylus not bearing finger-shaped process. There is also a noticeable difference in the shape of process on tergite nine which is narrow in the new species, but broad in T. (S.) bhishma .

Etymology. The specific epithet is a noun “ pianma ” with Latin suffix “ ensis ”, referring to the type locality of the new species, Pianma.

Figures

Figures 1–6. Tipula (Sivatipula) pianmaensis sp. nov. 1. Head, dorsal view. 2. Thorax, lateral view. 3. Thorax, dorsal view. 4. Wing. 5. Abdomen and hypopygiym, lateral view. 6. Hypopygium, lateral view.