Angarotipula tristis Yang, 2022

Yang, Qi-Cheng, Zhang, Bing, Yang, Ding & Liu, Xiaoyan, 2022, Descriptions of a new species of genus Angarotipula and life history of Angarotipula laetipennis (Alexander, 1935) (Diptera, Tipulidae), Biodiversity Data Journal 10, pp. 82427-82427 : 82427

Angarotipula tristis Yang, 2022 sp. n.

Materials

Type status: Holotype. Occurrence: recordedBy: Cai Xiao-Dong; sex: male; Taxon : higherClassification: Animalia ; Arthropoda ; Insecta ; Diptera ; Nematocera ; Tipulomorpha ; Tipuloidea ; Tipulidae ; Tipulinae ; Angarotipula ; kingdom: Animalia ; phylum: Arthropoda ; class: Insecta ; order: Diptera ; family: Tipulidae ; genus: Angarotipula ; specificEpithet: tristis; Location : continent: Asia ; country: China; countryCode: CN; stateProvince: Sichuan; county: Ganzi Tibetan Autonomous Prefecture ; municipality: Daocheng ; locality: Yading Hongcaodi (亚丁 红草地 ) ; verbatimLocality: Hongcaodi (红草地); verbatimElevation: 3751 m; verbatimLatitude: 29°06'11"N; verbatimLongitude: 100°13'59.6"E; Identification: identifiedBy: Yang Qi-Cheng; Event: year: 2019; month: 7; day: 9; verbatimEventDate: 9-VII-2019; habitat: intermittent wetlands; fieldNotes: Plant dominant species: Polygonaceae; Record Level: type: PhysicalObject; language: en; institutionCode: CAU Type status: Paratype. Occurrence: recordedBy: Cai Xiao-Dong; sex: 2 males; Taxon : higherClassification: Animalia ; Arthropoda ; Insecta ; Diptera ; Nematocera ; Tipulomorpha ; Tipuloidea ; Tipulidae ; Tipulinae ; Angarotipula ; kingdom: Animalia ; phylum: Arthropoda ; class: Insecta ; order: Diptera ; family: Tipulidae ; genus: Angarotipula ; specificEpithet: tristis; Location : continent: Asia ; country: China; countryCode: CN; stateProvince: Sichuan; county: Ganzi Tibetan Autonomous Prefecture ; municipality: Daocheng ; locality: Yading Hongcaodi (亚丁 红草地 ) ; verbatimLocality: Hongcaodi (红草地); verbatimElevation: 3751 m; verbatimLatitude: 29°06'11"N; verbatimLongitude: 100°13'59.6"E; Identification : identifiedBy: Yang Qi-Cheng ; Event : year: 2019; month: 7; day: 9; verbatimEventDate: 9-VII-2019; habitat: intermittent wetlands; fieldNotes: Plant dominant species: Polygonaceae; Record Level: type: PhysicalObject; language: en; institutionCode: CAU

Description

Males (n = 3): body length 11.3-11.5 mm, wing length 13.4-13.6 mm, antenna length 2.9-3.0 mm.

Head (Fig. 1 A, B). Mainly brownish-black. Occiput without marking. Rostrum dark brown, except black dorsally. Nasus black. Gena yellowish-white. Setae on head pale yellow. Head with greyish-yellow pruinescence. Antennal scape brownish-black, with a white membranous and nearly round notch at apex. Pedicel dark brown. First flagellomere cylindrical, 1.25 times as long as scape, black with brown base with short thin black setae. Other flagellomeres black, broadened near middle, with few short black setae and appressed pale pubescence. Labellum and palpus brownish-black, except distal segment of palpus yellowish-brown, labellum and palpus with black setae.

Thorax (Fig. 1 A and B). Mainly black. Pronotum, prescutum, scutum and mediotergite black. Scutellum brownish-black. Pleuron black, with greyish-yellow pruinescence. Setae on dorsum of thorax pale yellow. Legs with first and second coxae black, third coxae with anterior 1/3 black and posterior 2/3 yellow, femora dark yellow with black basal margins and dark brown apexes; tibiae yellowish-brown, tarsi dark brown to black. Setae on legs brownish-black. Wing pale yellowish, areas surrounding major longitudinal veins strikingly yellowish; Rs arising at right angles from radius; m1 cell approximately triangular, petiole of m1 cell long, as long as m1 cell. Halter with stem brownish-yellow, knob grey (Fig. 1 C).

Abdomen (Fig. 1 A, B). Mainly yellow and black. Tergites yellow with a wide black middle stripe; first sternite pale yellow, others black. Setae on abdomen pale yellow.

Hypopygium (Fig. 2 A-G). Gonoxite separated from sternite IX by suture, reduced in size, slightly extended, posterior margin sharp. Tergite IX brownish-yellow, in shape of transverse plate with two pairs of horned lobes, inner pair flat and darkened along margin, covered with setae; outer pair stout, narrowed towards apex, dark brown with black apex, inner and lateral margins with less setae (Fig. 2 F); posterior margin of sternite IX with two tufts at middle. Phallic guide with a pair of petal-shaped projections on both sides (Fig. 2 G). Outer gonostylus yellow, fleshy and stout, apical third narrower, longer than broad (Fig. 2 A, B). Inner gonostylus with an irregular depression, inside of depression with short setae and distinct trichopores; beak dark brown, apex raised edge, with transparent trichopores and lots of dorsal setae, inner margin of beak with narrowed raised edge; inner base of inner gonostylus with an oval elevation (Fig. 2 C); in dorsal surface, beak with an elongate ridge with a concavity behind (Fig. 2 D, E); posterior margin of inner gonostylus with a banded depression, inner margin with a hemispherical hairy elevation (Fig. 2 D). Gonocoxal apodeme discontinuous, compressor apodeme and posterior immovable of sperm pump black (Fig. 2 H).

Diagnosis

Body blackish, partial yellow on the side of the abdomen; Rs arising at right angles from radius; m1 cell approximately triangular; posterior margin of tergite IX with two pairs of horned lobes; outer gonostylus apical third narrower; beak dorsally with an elongate ridge with a concavity behind.

Etymology

The name of this species is derived from the Latin word meaning "dull-coloured," referring to the colour of the blackish body.

Distribution

China (Sichuan).

Remarks

This new species is similar to A. frommeri (Alexander, 1966), based on the shape of hypopygium. However, in A. frommeri , the body is greyish-yellow; Rs arises at an acute angle from R.; the outer gonostylus has the lateral projections; and tergite IX has no projection ( Alexander 1966). The body colour of new species is similar to A. qinghaiensis Yang and Yang, 1996 from Qinghai, China. However, in A. qinghaiensis , the abdomen is completely black, the posterior margin of tergite IX is blunt without projection ( Yang and Yang 1996).

Figures

Figure 1. Angarotipula tristis, sp. n., male holotype. (A) Habitus, lateral view; (B) Wing; (C) Habitus, dorsal view. Scale bars = 1.0 mm.

Figure 2. Angarotipula tristis, sp. n., male holotype. (A) Hypopygium, lateral view; (B) Outer gonostylus, lateral external view; (C) Inner gonostylus, lateral view; (D) Inner gonostylus, medial view; (E) Inner gonostylus, ventral medial view; (F) Tergite nine, dorsal view; (G) Hypopygium, ventral view; (H) Gonocoxal apodeme andsperm pump, dorsal view. Scale bar (A-G): = 0.2 mm, Scale bar (H): = 0.25 mm. For abbreviations, see material and methods. Black arrows: depressions; Hollow arrows: protrusions.