Tipula (Sivatipula) biprocessa, Xue, Guo-Xi & Men, Qiu-Lei, 2016

Xue, Guo-Xi & Men, Qiu-Lei, 2016, New species of subgenus Tipula (Sivatipula) from China, with redescription of T. (S.) parvauricula and a key to all known species of the Oriental Region (Diptera, Tipulidae, Tipula), ZooKeys 563, pp. 33-42 : 35-38

Taxon classification Animalia Diptera Tipulidae

Tipula (Sivatipula) biprocessa sp. n. Figs 12-23

Diagnosis.

Generally straw-yellow; prescutum straw-yellow with three light brown stripes; wings pale brown with a dark brown stigma; abdomen bright yellow on basal three segments, gradually changed to light brown on apical ones, segments six and seven suffused with black; hypopygium straw-yellow, tergite nine rounded at posterior margin and equipped with two finger-like processes, ventral-lateral portions of tergite nine projected into two lobes, densely covered with black setae.

Description.

Male. Length: Body: 14.0-15.0 mm (not including antenna, n = 2); Wing: 19.0-20.0 mm (n = 2); Antenna: 18.0-19.0 mm (n = 2).

Head straw-yellow (Figs 12-13). Rostrum light brown with a light brown nasus. Vertex without marking (Fig. 12). Eyes black (Fig. 12). Antenna: 12-segmented, distinctly longer than body; scape light yellow, expanded apically; pedicel light yellow, short; flagellomeres light brown, each flagellomere cylindrical, subequal in length, with abundant black verticils. Palpi light brown.

Thorax with pronotum entirely orange-yellow (Figs 13-14). Prescutum straw-yellow with three light brown stripes (Fig. 14). Scutum orange-yellow with two light brown stripes (Fig. 14). Scutellum and postnotum orange-yellow (Fig. 14). Pleura entirely bright yellow (Fig. 13). Legs slender, coxae and trochanters straw-yellow, femora straw-yellow with light brown tip, tibiae and tarsi light brown. Halteres with stem yellow, knob darker. Wings pale brown, cell sc darker than ground color, stigma dark brown (Fig. 15). Sc relatively short, subequal to R3 in length, petiole of cell m1 slightly longer than m-m, approximately one-half length of discal cell (Fig. 15).

Abdomen bright yellow on basal three segments, gradually changed to light brown on apical ones, segments six and seven suffused with black (Fig. 16). Hypopygium straw-yellow (Fig. 16). Hypopygium broad, compressed (Figs 16-17). Tergite nine rounded at posterior margin with two finger-like processes, lateral sides of tergite nine with numerous long hairy setae, longest one longer than finger-like process (Fig. 18). Sternite nine broader than tergite nine, median region of sternite nine protruded to a membranous extension (Fig. 17). Outer gonostylus narrow, flattened, apical two-fifths curved caudad (Figs 19-21). Inner gonostylus flattened, narrowed medially, a slender lobe generated from the median region of inner gonostylus (Figs 19-21).

Semen pump with compressor apodeme V-shaped, the arms expanded at apex, distinctly broader than that of Tipula (Sivatipula) parvauricula (Fig. 22). Posterior immovable apodeme with one arm, distinctly longer than compressor apodeme, gradually narrowed to apex and curved cephalad in lateral view, the arm deeply grooved in dorsal view, basal region distinctly wider than that of Tipula (Sivatipula) parvauricula (Figs 22-23). Anterior immovable apodeme flattened, gradually narrowed to apex in lateral view (Fig. 22). Aedeagus elongated, tubular, at least ten times longer than semen pump.

Material examined.

Holotype male. CHINA: Guangxi Zhuang Autonomous Region, Dalongping, Cenwanglaoshan Mountain, 24°31'N, 106°17'E, 1300 m, 7 May 2015, Guo-Xi Xue leg. Paratype. 1 male, same data as holotype.

Remarks.

We compared the new species with all known species based on published descriptions and illustrations, and found that it is mostly similar to Tipula (Sivatipula) parvauricula by the color of body, the structures of antenna and hypopygium. It can be easily distinguished from the latter by the shape of tergite nine which is rounded at posterior margin with two distinct finger-like processes. The latter species has its tergite nine separated by a V-shaped notch with two short truncated processes and produced into a pair of ear-like processed ventrally. There is also a noticeable difference in the shape of the outer gonostylus which is simple and narrowed in the new species, but flattened and widened medially with a slender rod on ventral-lateral margin in that of Tipula (Sivatipula) parvauricula . Distinct interspecific difference is also found in the shape of inner gonostylus as Figures 8, 19 and 20.

Etymology.

The specific epithet is a noun derived from the Latin ‘processa’ with Latin prefix ‘bi’, referring to the presence of two finger-shaped processes at posterior margin of tergite nine.

Distribution.

China (NW. Guangxi).