Limonia subcosta, Ren & Yang, 2020

Ren, Jinlong & Yang, Ding, 2020, Two new species of Limonia Meigen, 1803 from Northwest China (Diptera, Limoniidae), ZooKeys 971, pp. 31-58 : 31

publication ID	https://dx.doi.org/10.3897/zookeys.971.35875
publication LSID	lsid:zoobank.org:pub:16EEDB7D-1341-4DD0-9498-A37D9F0DC5DD
persistent identifier	https://treatment.plazi.org/id/142913C6-D932-4AE5-8169-D44C8D3EE2AF
taxon LSID	lsid:zoobank.org:act:142913C6-D932-4AE5-8169-D44C8D3EE2AF
treatment provided by	ZooKeys by Pensoft
scientific name	Limonia subcosta
status	sp. nov.

Treatment

5. Limonia subcosta View in CoL sp. nov. Figures 35-37 View Figures 35–38 , 39-42 View Figures 39–42 , 43-44 View Figures 43–44

Diagnosis.

Flagellar verticils 1.5 times longer than corresponding segment. Prescutum with three reddish-brown longitudinal stripes. Scutum dark brown, with triangular yellow marking at postero-lateral margin. Wing dull brown, variegated with zigzag whitish bands at origin of Rs before cord; Sc2 apically reaching 1/2 of Rs. Posterior margin of tergite 9 emarginated with two finger-like, sclerotized protrusions. Paramere with blunt apex that ends at 7/10 of aedeagus. Female, hypogynial valve 1.8 times longer than wide at base.

Description.

Male (n = 4): body length 6.5-7 mm, wing length 7-7.5 mm.

Head mostly black-brown (Fig. 35 View Figures 35–38 ). Vertex dark brown. Occiput dark brown, covered with sparse setulae. Antenna 14-segmented; scape, pedicel, and flagellomeres black-brown, except for basally dull-yellow first flagellomere; flagellar verticils black, 1.5 times longer than corresponding segment. Nasus 2/5 as long as rostrum. Rostrum and nasus brown to dark brown, with black setulae. Labella pale brown, with black setulae. Palpi brownish gray, with black setulae.

Thorax (Figs 35 View Figures 35–38 , 36 View Figures 35–38 ). Mostly reddish brown to black brown. Cervical sclerite dark brown, with black outer margin. Pronotum dark brown, with sparse black setulae. Prescutum with three reddish brown longitudinal stripes. Scutum dark brown, with triangular yellow marking at postero-lateral margin. Scutellum brown with black setulae at posterior margin. Mediotergite reddish brown, with U-shaped, black-brown marking at posterior margin (Fig. 28 View Figures 26–28 ). Mesopleura entirely black-brown; episternum with sparse, yellow setulae. Legs: coxae and trochanters brown, with black setulae; femora, tibiae, and tarsi dull brown; femora with two subapical rings (outer one black-brown, inner one dull brown). Wing dull brown, variegated with zigzag whitish bands at origin of Rs before cord (basal section of R4+5, r-m, and m-cu); Sc2 apically reaching 1/2 of Rs; basal deflection of CuA1 slightly beyond branching point of M; R2 absent (Fig. 37 View Figures 35–38 ). Halter with stem brown; knob dull brown (Fig. 35 View Figures 35–38 ).

Abdomen (Fig. 35 View Figures 35–38 ). Mainly reddish brown. Posterior margin of abdominal segments 1-4 with dark-brown ring. Venter dull yellow. Posterior margin of abdominal segments 5-8 with pale yellow ring. Hypopygium reddish brown. Abdominal setulae black.

Hypopygium (Figs 39-42 View Figures 39–42 ). Posterior margin of tergite 9 emarginated with two finger-like, sclerotized protrusions (Fig. 39 View Figures 39–42 ). Gonocoxite wider than long (Figs 39-41 View Figures 39–42 ). Gonostylus black-brown, apically slender, and basally with slightly swollen covered with longer setulae (Figs 31 View Figures 29–32 , 32 View Figures 29–32 ). Proctiger globular and membranous. Paramere with short obtuse apex (Fig. 34 View Figures 33–34 ). Paramere with fan-shaped base and blunt apex that ended at 7/10 of aedeagus (Figs 41 View Figures 39–42 , 42 View Figures 39–42 ). Aedeagus forked; ventral margin with mid-protrusion that anterior margin with cube-shaped (Figs 40 View Figures 39–42 , 42 View Figures 39–42 ).

Female (n = 5): body length 7-8 mm, wing length 7-8.5 mm.

Female resembling male in head, thorax, and wing. Female terminalia (Fig. 46 View Figures 45–47 ) reddish brown. Cercus brown, with slightly arched dorsally at apex, slender, and 2 times longer than wide at base. Hypogynial valve 1.8 times longer than wide at base; lateral margin with oval, black marking (Figs 43 View Figures 43–44 , 44 View Figures 43–44 ).

Type material.

Holotype male, China: Shaanxi, Foping, Panda valley, 33.66N, 107.98E, elev. 1470 m, 2016.VII.10-2016.VII.21, Ruie Nie (Malaise trap) (CAU). Paratypes: 2 males, 2 females, China: Shaanxi, Foping, Panda valley, 33.67N, 107.98E, elev. 1460 m, 2016.VII.17-2016.VII.19, Ruie Nie (Malaise trap) (CAU). 1 male, China: Shaanxi, Foping, Panda valley, 33.67N, 107.979E, elev. 1470 m, 2016.VII.17, Ruie Nie (Malaise trap) (CAU). 1 male, 1 female, China: Shaanxi, Foping, Panda valley, 33.67N, 107.98E, elev. 1470 m, 2016.VII.17-2016. VII.21, Ruie Nie (Malaise trap) (CAU). 2 females, China: Shaanxi, Yangxian, Maopingzhen, elev. 910 m, 2017. VIII.8, Xulong Chen (Malaise trap) (CAU).

Distribution.

China (Shaanxi: Foping, Yangxian).

Etymology.

The specific name, from Latin, sub and costa (meaning "below the costa", refers to relative position of Sc to Rs.

Remarks.

This new species is similar to L. pernigrina Alexander, 1938 in the wing marking and shape of the gonostylus. It can be separated from the latter by the following features: Sc2 ended at 1/2 of Rs; branch pointing of Rs with small, whitish spot; posterior margin of tergite 9 with a narrow, median recession and long, finger-like protrusions (Figs 29 View Figures 29–32 , 31 View Figures 29–32 ). In L. pernigrina , the Sc2 ends almost at branch of Rs; the branch pointing of Rs has a large whitish band that is linked anteriorly with the costal margin of the wing (Fig. 30 View Figures 29–32 ); and the posterior margin of tergite 9 has a broad, median recession and short, finger-like protrusions ( Alexander 1938b).