Hirtodrosophila nigrispina Chen, Katoh & Gao, 2019

Chen, Yu, Katoh, Takehiro K. & Gao, Jian-Jun, 2019, The Hirtodrosophila melanderi species group (Diptera: Drosophilidae) from the Huanglong National Nature Reserve, Sichuan, China, Zootaxa 4623 (1), pp. 113-131 : 127-130

Hirtodrosophila nigrispina Chen, Katoh & Gao , sp. nov.

( Figs 3 I–L, 5M–R, 10)

Diagnosis. Epandrial ventral lobe with apical acute projection ( Fig. 10D ). Cercus ventrally with numerous black, thick spines nearly the same in size ( Fig. 10E ). Aedeagus apically broadened, medial margin flat in ventral view, with a pair of lateral processes and medial membranous protrusion ( Fig. 10 J–L); lateral processes distally parallel with each other in ventral view, finely serrate on dorsal margin ( Fig. 10J, N ).

Description (characters commonly seen in H. zhangae sp. nov. not repeated) (♂, ♀). Head ( Figs 3I, J , 5 M–R): Frontal vitta brown. Fronto-orbital plate dark brown, anteriorly paler. Ocellar setae inserted slightly inside triangle made by ocelli. Face and facial carina brown, ventrally darker. Gena yellowish brown, anteriorly darker. First flagellomere dark grayish brown. Supracervical setae ca. 10 per side; postocular setae 23–26 per side. Clypeus brown to dark brown. Palpus pale grayish yellow, with one apical and 1–2 subapical, prominent setae. Cibarium with ca. seven medial and 23–25 posterior sensilla per side.

Legs ( Fig. 3I ): Foreleg 1st tarsomere shorter than total length of four succeeding tarsomeres. Mid- and hindleg 1st tarsomeres slightly shorter than or as long as total length of four succeeding tarsomeres.

Abdomen ( Fig. 3I, L ): Caudal bands medially often narrowed or interrupted.

Male terminalia ( Fig. 10 A–N): Epandrium with ca. 28 long setae per side. Cercus with 37–41 long setae, ventral ones thicker. Surstylus ventrally tapered and vent posteriad, with upper row of ca. six prensisetae, and lower row of ca. seven prensisetae; inner surface with ca. 18 long setae, anterior ones longer and thinner; anterior margin with ca. four short setulae. Tenth sternite anteromedially concaved, somewhat heart-shaped in ventral view. Paramere with ca. five minute sensilla along apical to dorsosubapical margin. Aedeagal apodeme straight, thin, much shorter than and fused to aedeagus.

Female terminalia ( Fig. 10 O–Q): Tergite VIII grayish brown to dark grayish brown, pubescent dorsally to caudolaterally. Oviscapt valve distally somewhat quadrate in lateral view, with ca. four lateral and ca. 16 marginal, peg-like ovisensilla. Spermathecal capsule slightly broader than long, with introvert about 4/5 height of capsule; introvert only scarcely wrinkled.

Measurements (in mm): BL = 2.88 in holotype (range in 4♀ paratypes: 2.94–3.45), ThL = 1.22 (1.24–1.29), WL = 3.34 (3.24–3.46), WW = 1.40 (1.38–1.52).

Indices: FW/HW = 0.52 (range in 4♀ paratypes: 0.49–0.50), ch/o = 0.26 (0.17–0.20), prorb = 0.74 (0.66–0.84), rcorb = 0.32 (0.27–0.44), vb = 0.40 (0.33–0.40), orbito = 0.64 (0.55–0.65), dcl = 0.60 (0.53–0.58), sctl = 1.18 (1.08–1.20), sterno = 0.40 (0.55–0.84), dcp = 0.47 (0.39–0.48), sctlp = 1.44 (1.12–1.16), C = 3.44 (3.15–3.38), 4c = 0.66 (0.66–0.73), 4v = 1.47 (1.43–1.55), 5x = 1.52 (1.61–1.83), ac = 2.48 (2.42–2.87), M = 0.43 (0.45–0.49), C3F = 0.37 (0.34–0.42).

Holotype. ♂ (#06472), CHINA: Danyunxia Station, Huanglong Nature Reserve, Ngawa , Sichuan, 32°43'36" N, 104°02'55" E, 2,140 m, 16.ix.2018, ex banana trap, J.J. Gao, W.F. Zhang, and Y.F. Zou.

Paratypes. CHINA: 4♀ (#06473, #06475−77), same data as holotype .

Distribution. China (Sichuan).

Etymology. Referring to the black, thick spines on ventral portion of cercus.

Remarks. The paratype female specimens were identified as conspecific with the holotype male specimen #06472 by morphological similarity, though the body color pattern of #06472 rather indistinct than females. Considering the insufficiency of evidence of species-level divergence between the holotype and paratype specimens, we tentatively describe them as of the same species.

Figures

FIGURE 3. Left lateral habitus, head and thorax (dorsal view), wing (left ventral or right dorsal view), and abdomen (dorsal view). A−D, H. zhangae sp. nov. (holotype #06470); E−H, H. zouae sp. nov. (holotype #06468); I−L, H. nigrispina sp. nov. (holotype #06472).

FIGURE 5. Head (anterior view), postocciput (posterior view), cibarium (dorsal and lateral view), and prementum (ventral and lateral view). A−F, H. zhangae sp. nov. (holotype #06474); G−L, H. zouae sp. nov. (holotype #06471); M−R, H. nigrispina sp. nov. (paratype #06473).

FIGURE 10. Hirtodrosophila nigrispina sp. nov. (A−N: holotype #06472; O−Q: paratype #06473). A, B, periphallic organs (posterior and posterolateral view, respectively); C, D, ventral lobe of epandrium (lateral and posterior view, respectively; red arrow point at apical projection); E, cerci (ventral view); F, dorsal part of surstylus (posterolateral view); G, inner surface of surstylus (posterolateral view); H, I, 10th sternite (anterior and dorsal view, respectively); J−L, phallic organs (ventral, ventro- lateral, and lateral view, respectively); M, sensilla of paramere (ventrolateral view); N, lateral process of aedeagus (lateral view; red arrows point at fine serration); O, P, oviscapt (ventral and lateral view, respectively); Q, spermatheca.