Mohrigia angusta Xu & 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 : 73

Mohrigia angusta Xu & Huang , sp. nov.

( Figs 1 , 14 C, 16)

Material examined. Holotype, male. China, Shaanxi. Ningshan, Niujiliang Nature Reserve, Gangou , 33°49.5532'N, 108°47.2403'E, 1778 m, 10-VIII-2013, leg. Jun Xu [SM01896].

Diagnosis. The species is characterized by its slender gonostylus a strong tooth arising from a subapical dorsal lobe, with two long flagellate setae on the inner side of the gonostylus; hypopygium without intercoxal lobe; tegmen pyramidal, parameral apodeme continuously sclerotized forming a central strip on dorsal side and a fingerlike process at the apex.

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

Head ( Figs 1 D, E). Eye bridge with 3 rows of facets. Maxillary palps 3-segmented, basal segment with 1 seta; 2nd segment with 8 setae; 3rd segment with 6 setae. Length/width index of 4th flagellomere: 3.24–3.52.

Thorax. Anterior pronotum with 3 setae, episternum 1 with 5 setae. Wings ( Fig. 14 C). Wing length 1.47 mm, width/length: 0.39. c/w: 0.71. R1/R: 0.58. r-m, stM, M1 and M2 bare, CuA1 and CuA2 bare. Legs ( Fig. 1 F). Length of spur/width of foretibia 0.98. Length of femur/length of metatarsus: foreleg 1.51. Length of metatarsus/length of tibia: foreleg 0.51, hind leg 0.46. Length of hind tibia/length of thorax 1.22. Claws toothed.

Hypopygium ( Figs 1 A–C). The gonocoxite as long as the gonostylus. The gonostylus slender, densely setose on the apicoventral part, with a strong tooth arising from a subapical dorsal lobe, two long flagellate setae on the inner side of the gonostylus. Hypopygium without intercoxal lobe. Tegmen pyramidal, parameral apodeme continuously sclerotized forming a central strip on dorsal side and a finger-like process at the apex. Aedeagus relatively short. Sternite 10 with 1 seta on each half.

Distribution. China (Shaanxi, Fig. 16 ).

Remarks. This new species is very similar to M. rusticana, Rudzinski, 2006 and M. structura Rudzinski, 2006 in sharing a slender gonostylus with the subapical tooth arising from a dorsal lobe. A distinct difference is observed on the intercoxal lobe, since it is absent in the new species, while the other two species both have a small intercoxal lobe. Additionally, the tegmen is pyramidal in the new species and M. structura , while trapezoidal in M. rusticana . The new species and M. rusticana have 3-segmented palps, while it is 2-segmented in M. structura . Further differences could also be found on the sclerotized parameral apodeme.

Etymology. This species is named after its slender gonostylus, from the Latin adjective angustus, meaning long and narrow.

Figures

FIGURE 1. Mohrigia angusta sp. nov., male. holotype. A, right gonostylus, ventral view; B, right gonostylus, dorsal view; C, gonocoxite, ventral view; D, palps, lateral view; E, 4 th flagellomere, lateral view; F, apex of foretibia, posteroventral view. Scale bar = 0.10 mm.

FIGURE 14. Wings, dorsal view. A, Mohrigia cylindrata sp. nov. (holotype); B, Mohrigia globulosa sp. nov. (holotype); C, Mohrigia angusta sp. nov. (holotype); D, Mohrigia notolobos sp. nov. (holotype); E, Mohrigia scrobiculata sp. nov. (holotype); F, Mohrigia orthacantha (Yang, Zhang & Yang, 1993) (neotype). 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.