Nephrotoma liankangensis, Men, Qiu-Lei, Xue, Guo-Xi & Yang, Hai, 2015

Men, Qiu-Lei, Xue, Guo-Xi & Yang, Hai, 2015, Two new species of the genus Nephrotoma (Diptera, Tipuloidea, Tipulidae) from China with a key to species from Mainland China, ZooKeys 532, pp. 117-136 : 126-127

Taxon classification Animalia Diptera Tipulidae

Nephrotoma liankangensis sp. n. Figs 1-9, 10-19

Diagnosis.

Antennae with flagellum light brown, pleura light yellow conspicuously patterned with white, abdominal tergites with two black lateral stripes and one brown median stripe, ninth tergite with two rounded lobes which are densely covered with black spines, posterior margin of ninth tergite not concaved at base of lobes.

Description.

Male (n=2): body length 9.8 mm, wing 10.5 mm, antenna 5.8 mm.

Nasus yellow with black setae, palpi black. Antennae relatively long, if bent backward extending to the first abdominal tergite, scape and pedicel yellow, flagellum 10-segmented, with the first flagellomere yellow, with the second to tenth flagellomeres light brown and enlarged at both ends, the basal enlargement black with black setae basally, subequal to the flagellomeres from which they arise. Head yellow, occipital brand brown and narrow, along the middle line of occiput (Fig. 1).

Pronotum light brown, changing into yellow in middle. Prescutum yellow with three brown stripes, median one expanded apically, not extending to the hind border, lateral stripe straight and rounded apically, extending slight beyond the middle of median stripe (Fig. 2). The median stripe lighter in coloration than lateral one, sometimes divided by a yellow line (Fig. 2). Scutum light brown, each lobe with jet-black anterior border, median area of scutum yellow (Fig. 2). Scutellum yellowish. Postnotum light brown. Pleura yellowish brown, variegated by white on anepimeron, katepimeron, meron and basal laterotergite. Halters yellowish brown throughout. Legs with coxae and trochanters yellow; femora and tibiae yellow with brown tips; tarsi dark brown. Wings transparent, cells c and sc suffused with brown; stigma oval, dark brown; wing tip narrowed and slightly suffused with light brown. Cell r1 without stigmal trichia, cell m1 petiolate (Fig. 3).

Abdomen generally yellow, the first tergite light brown, tergites two to six with a light brown median stripe and two black lateral stripes, sternites two to seven with light brown median stripe, hypopygium chiefly yellowish brown. Male hypopygium (Figs 4, 5) with the ninth tergite having the median notch rounded basally, gradually narrowed to apex, separating the ninth tergite into two rounded lobes, the lobe black and densely covered with black spines (Fig. 6). Outer gonostylus lanceolate, basally widened and gradually narrowed to the end (Figs 4, 5, 7). Inner gonostylus with two black beaks (Figs 8, 9).

Aedeagal guide horn-shaped in lateral view, very acute apically (Fig. 10); paramere lamellate, blunt apically (Fig. 10); ventral appendage of aedeagal guide horn-like in lateral view, boot-shaped in dorsal view (Figs 10, 11).

Semen pump with posterior immovable apodeme (PIA) narrow, dorsally bent in lateral view (Fig. 13); compressor apodeme (CA) fan-shaped, with an obviously expanded median ridge in lateral view, in a 90° angle with posterior immovable apodeme (Figs 12-14); anterior immovable apodeme (AIA) broader than compressor apodeme, with lateral margins arched and inner margins straight, separated medially (Fig. 12).

Female (n=2): body length 16.2 mm, wing 12.0 mm, antenna 3.2 mm.

The general coloration of head, thorax and abdomen similar to that of male.

Antennae relatively short, if bent backward not extending to abdomen, scape and pedicel yellow, flagellum 10-segmented, each flagellomere cylindrical, gradually shorter and slightly enlarged at base, the basal two flagellomeres yellow, three to ten flagellomeres yellowish brown with black at base.

Ovipositor yellowish brown, ninth sternite very thin, lanceolate, separated medially (Fig. 17). Sternite ten slightly shorter than cerci, parallel in lateral margins in dorsal view (Fig. 16). Cerci long, acinacifoliate, widened at basal three fifths, narrowed at apical two fifths, surpassing the end of hypovalva (Fig. 15). Hypovalva simple, extending to nearly three quarters length of cerci (Fig. 15).

Vaginal apodeme widened at basal half and gradually tapered to the end, very acute apically (Fig. 17). Spermatheca spherical, brown, well-sclerotized, with membranous angular extension on lateral side (Figs 18, 19).

Material examined.

Holotype male. Pinned specimen. China: Henan Province, Xin County, Liankangshan National Nature Reserve, 18 Jul. 2014, coll. Qiulei Men. Paratype. Pinned specimen. China: 1 male 2 females, same data as holotype, coll. Wu Zeng.

Distribution.

China (Henan).

Etymology.

The specific epithet is a noun ‘liankang’ with Latin suffix ‘ensis’, referring to the distribution of the new species.

Remarks.

This new species is similar to Nephrotoma pseudoliankangensis , as discussed below, and another Chinese species, Nephrotoma sinensis (Edwards, 1916), by the coloration of the prescutum and wings, the shape of lobes on the ninth tergite and the shape of inner gonostylus. It can be easily distinguished from the latter by the prescutum not bearing a black spot on anterior portion of the lateral stripe (this black spot present in Nephrotoma sinensis as described by Liu et al. 2009: 43), the ninth tergite without spiny prominence on each side of lobes (this spiny prominence on each side of lobes in Nephrotoma sinensis as illustrated by Sidorenko 1999: 112), and the inner gonostylus broad apically (apical half obviously narrower than that of Nephrotoma liankangensis in Nephrotoma sinensis as illustrated by Sidorenko 1999: 112).