Mohrigia truncatula Shi & Huang, 2017

Xu, Jun, Shi, Kai, Huang, Junhao & Wu, Hong, 2017, Review of the genus Mohrigia Menzel (Diptera, Sciaridae) from China, Zootaxa 4300 (1), pp. 71-98 : 95-96

Mohrigia truncatula Shi & Huang , sp. nov.

( Figs 13 , 15 C, 16)

Material examined. Holotype, male. CHINA . Fujian, Wuyishan, Xingcunzhen, Tongmucun, Longdu, sweep-net, 27-IV-2012, leg. Kai Shi [SM01601]. Paratype, Zhejiang . 1 male, Lishui, Jingning, Yujikeng, sweep-net, 29-VII- 2010, leg. Lu-Jing Yang [SM01566].

Diagnosis. The species is characterized by its ovate gonostylus with a slightly curved apical tooth arising from a well-developed lobe, two to three flagellate setae on the ventral mesial margin of gonostylus; hypopygium with a small conical setose intercoxal lobe; tegmen apically truncate, parameral apodeme continuously sclerotized forming a central strip on dorsal side.

Description (male). Head dark brown; palps, antenna, thorax, abdomen and hypopygium brown; legs yellowish-brown; wings fumose.

Head ( Figs 13 C, D). Eye bridge with 3 rows of facets. Prefrons with 7 setae. Clypeus with 1 seta. Maxillary palps 3-segmented, basal segment with 1–2 setae. Length/width index of 4th flagellomere: 2.19–2.64.

Thorax. Anterior pronotum with 2–4 setae, episternum 1 with 1–2 setae. Wings ( Fig. 15 C). Wing length 1.63– 2.03 mm, width/length: 0.47–0.49. c/w: 0.71–0.72. R1/R: 0.62–0.70. M, CuA, stM and r-m nonsetose. Legs ( Fig. 13 E). Foretibia with bordered posteroventral patch of modified setae. Length of spur/width of foretibia 1.03–1.11. Length of femur/length of metatarsus: foreleg 1.23–1.29. Length of metatarsus/length of tibia: foreleg 0.58–0.59, hind leg 0.48. Length of hind tibia/length of thorax 1.18–1.44. Claws toothed.

Hypopygium ( Figs 13 A, B). The gonocoxite as long as the gonostylus. The gonostylus ovate, with densely setose on the apicoventral part, with a slightly curved apical tooth arising from a well-developed lobe, two to three flagellate setae on the ventral mesial margin of gonostylus present. Hypopygium with a small conical setose intercoxal lobe. Apex of Tegmen truncate, parameral apodeme continuously sclerotized forming a central strip on dorsal side. Aedeagus relatively short. Sternite 10 with 1 seta on each half.

Distribution. China (Zhejiang, Fujian, Fig. 16 ).

Remarks. This species is close to M. megalocornuta ( Mohrig & Menzel, 1992) in sharing a well-developed dorsal lobe on an ovate gonostylus, and apically truncate tegmen with parameral apodeme continuously sclerotized forming a central strip on dorsal side. The new species differs in having a dorsal lobe arising from the subapical part, while it is arising from the apex in M. megalocronuta .

Etymology. This species is named after its apically truncate tegmen, from the Latin adjective truncatulus, meaning truncate.

Figures

FIGURE 13. Mohrigia truncatula sp. nov., male, holotype. A, part of hypopygium, ventral view; B, right gonostylus, ventral view; C, palps, lateral view; D, 4 th flagellomere, lateral view; E, apex of foretibia, posteroventral view. Scale bar = 0.10 mm.

FIGURE 15. Wings, dorsal view. A, Mohrigia ovoidea sp. nov. (holotype); B, Mohrigia inflata sp. nov. (holotype). C, Mohrigia truncatula sp. nov. (holotype); D, Mohrigia megalocornuta (Mohrig & Menzel, 1992). Scale bar = 0.50 mm.

FIGURE 16. Geographical distribution of Mohrigia from China. The different coloured shapes refer to different collecting sites of the species.