Limonia medexocha, 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

2. Limonia medexocha sp. nov. Figures 10-12 , 13-16

Diagnosis.

Occipital marking Y-shaped. Flagellar verticils 3 times longer than corresponding segment. Postgena with short narrow stripe near inner margin of eyes. Prescutum with one broad, dark-brown mid-longitudinal stripe. Wing stigma pale brown with yellowish brown margin; Sc1 apically reaching 3/5 of Rs. Abdominal dorsum with one dark-brown mid-longitudinal stripe. Posterior margin of tergite 9 with two finger-like sclerotized protrusions. Gonostylus with blunt apex and swollen base. Paramere reniform, apex ended at 2/5 of aedeagus. Aedeagus with strong ventral mid-protrusion.

Description.

Male (n = 2): body length 9-10.5 mm, wing length 10-11 mm.

Head mostly yellow (Figs 10 , 11 ). Vertex dull yellow. Occiput dull yellow, covered with black setulae. Occipital marking dark brown, but pale brown at posterior part, Y-shaped, with anterior marking linked with inner margin of eyes. Head with black setulae. Antenna 14-segmented; scape dark brown, pedicel yellowish brown, flagellomeres yellowish brown; flagellar verticils black, three times longer than corresponding segment. Nasus 1/2 as long as rostrum. Rostrum and nasus brown to dark brown. Labella pale yellow, with black setulae and inner margin with brown. Postgena light yellow with short narrow stripe near inner margin of eyes. Palpi dark brown with black setulae.

Thorax mostly yellow (Figs 10 , 11 ). Cervical sclerite pale brown with black outer margin. Pronotum dull yellow with dull brown median stripe. Prescutum with one broad, dark-brown mid-longitudinal stripe and black setulae at lateral margin. Scutum dark brown with black setulae around outer margin. Scutellum dark brown with tapered yellow median stripe. Mediotergite dark brown (Fig. 11 ). Mesopleura entirely light yellow except katepisternum with dark brown margin at antero-lateral corner and subspiracular sclerite dull yellow; center of episternum with eight black setulae. Legs with coxae and trochanters yellow; femora yellowish brown with dark-brown terminal ring; tibiae yellowish brown, with dull brown subapical ring; tarsi reddish brown to dark brown. Setulae on legs black. Wing hyaline, pale brown; stigma pale brown with yellowish brown margin; Sc1 apically reaching 3/5 of Rs; while Sc2 apically reaching 3/4 of Rs; basal deflection of CuA1 far before branching point of M. (Fig. 12 ). Halter with dull-brown stem and pale-brown to dark-brown knob (Fig. 10 ).

Abdomen mainly light yellow (Fig. 10 ). Dorsum with one dark-brown mid-longitudinal stripe. Abdominal segments 7-9 entirely dark brown; hypopygium mostly dark brown.

Hypopygium (Figs 9 - 12 ). Posterior margin of tergite 9 with two finger-like, sclerotized protrusions that constrict at base and project outward at apex (Fig. 9 ). Gonocoxite wide at base and narrow at apex, longer than wide. Gonostylus with blunt apex and swollen basal protrusion that is strongly outward and hairy (Figs 9 - 11 ). Paramere reniform with small apical protrusion and rod-shaped; apex ended at 2/5 of aedeagus (Figs 13-16 ). Aedeagus complex; mid-ventral margin with strong protrusion which is long and rectangular in lateral view (Fig. 15 ); outer margin serrated; apex with small notch; spherical protrusion located mid-ventrally at base (Figs 13-16 ).

Female (unknown)

Type material.

Holotype male, China: Ningxia, Guyuan, Liupan Mountain, 35.38N, 106.31E, elev. 2210 m, 2017.VII.20, Jiale Zhou (CAU). Paratypes: 1 male, China: Sichuan, Pingwu, Wanglang, elev. 2910 m, 2017.VII.29, Yuqiang Xi (CAU).

Distribution.

China (Ningxia: Guyuan; Sichuan: Pingwu).

Etymology.

The specific name, from Latin, medius (adj., meaning “middle”), and Greek exocha (adj., meaning “protruded”), refers to the median protrusion at the dorsal margin of the aedeagus.

Remarks.

This new species is very unique and differs from other known species of Limonia . This new species is somewhat similar to L. macrostigma (Schummel, 1829) in wing stigma . It can be separated from the latter by the following features: body yellow; occiput yellow with Y-shaped marking; gonostylus with obtuse apex; paramere with obtuse apex; aedeagus with strong mid-ventral protrusion. In L. macrostigma , the body is brown; the occiput is black brown; the prescutum has two lateral stripes; the gonostylus has a slender apex; the paramere has a slender and pointed apex; and the aedeagus has no mid-dorsal protrusion ( Podenas and Podeniene 2017).

Figures

Figures 10 - 12. Limonia medexocha sp. nov., male 10 male habitus, lateral view 11 head and thorax, dorsal view 12 right wing. Scale bars: 1.0 mm.

Figures 13 - 16. Limonia medexocha sp. nov., male 13 hypopygium, dorsal view 14 hypopygium, ventral view 15 hypopygium, lateral view 16 aedeagus and paramere. Scale bars: 0.1 mm.

Figures 8 - 9. Limonia macrostigma, female 8 cercus and hypogynial valves, lateral view 9 cercus and hypogynial valves, ventral view. Scale bars: 1.0 mm.