Lordiphosa hamatispina Katoh & Gao, 2018

Katoh, Takehiro K., Zhang, Guang, Toda, Masanori J., Zhang, Wen-Xia & Gao, Jian-Jun, 2018, The Lordiphosa denticeps species group (Diptera: Drosophilidae) in China, with redescriptions of four known species and descriptions of nine new species, Zootaxa 4471 (1), pp. 37-75 : 63-64

Lordiphosa hamatispina Katoh & Gao , sp. nov.

(Pls 2C, 3K, 4K, 6C, 7K; Fig. 13 )

Diagnosis. Male foreleg with sex-combs composed of blackish brown, thick, apically blunt teeth on 1st to 3rd tarsomeres: transverse, but irregular, rows densely covering nearly entire lengths of 1 st and 2nd tarsomeres; transverse rows not clearly separated from each other, rather oblique on proximal portion of 1 st tarsomere ; 1 distal transverse row of 3 teeth on 3rd tarsomere ( Fig. 13A,B ). Cercus ventrally tapered, with a fringe of 6–7 spines on ventrosubapical margin ( Fig. 13C,D,G ) and largest, apically hook-like curved spine at ventral apex ( Fig. 13F ). Paramere distally thin, strongly curved ventrad and outward, medially slightly sinuate ( Fig. 13J–L ), apically with minute bifurcation ( Fig. 13M ). Gonopods dorsally not concaved, slightly curved dorsad in lateral view ( Fig. 13L ).

Description (characters commonly seen in L. yangi sp. nov. not repeated) (♂). Head (Pls 2C, 3K, 4K, 6C, 7K): Frontal vitta yellowish brown. Fronto-orbital plate dark grayish yellow, anteriorly yellowish brown. Ocellar triangle dark grayish yellow. Occiput dark brown, dorsomedially yellowish brown. Supracervical setulae 16̄17 per side; postocular setae 13–15 per side. Clypeus pale grayish yellow. Cibarium with 19¯23 medial and 16 posterior sensilla per side. Prementum with 4–5 (1 proximal, 1–2 lateral, and 2 distal) pairs of setae.

Thorax (Pl. 2C) yellowish brown. Mesonotum medially with 1 brown, longitudinal, anteriorly indistinct, caudally broadened stripe. Scutellum medially brown. Mid katepisternal seta distinctly longer than those below it.

Legs (Pl. 2C, Fig. 13A,B ): Midleg 1 st tarsomere longer than total length of 4 succeeding tarsomeres.

Abdomen (Pl. 2C): Tergites grayish brown, glossy, caudally with dark grayish brown, narrow, marginal bands.

Male terminalia ( Fig. 13C–M ): Epandrium with ca. 27 long setae per side. Cercus with ca. 22 long setae. Surstylus caudally with a row of ca. 12 prensisetae on caudodorsal margin and 23–29 recurved setae on ventral portion of inner surface. Aedeagal apodeme slightly longer than aedeagus.

Measurements (in mm): BL = 2.42 in holotype, ThL = 1.30, WL = 3.60, WW = 1.44.

Indices: FW/HW = 0.51, ch/o = 0.24, prorb = n/a, rcorb = n/a, vb = n/a, orbito = 0.38, dcl = 0.64, sctl = n/a, sterno = 0.49, dcp = 0.56, sctlp = 1.10, C = 3.43, 4c = 0.64, 4v = 1.50, 5x = 1.14, ac = 2.15, M = 0.36, C3F = 0.48.

Holotype. ♂ (#06027), Mt. Duoxiongla , Linzhi, Xizang, China, 3,500–3,800 m a.s.l., 24.ix.2010, J.J. Gao ( KIZ).

Distribution. China (Xizang).

Etymology. From Latin words “hamatus” and “spina” (meaning “hooked spine”), referring to the hook-like spine at the ventral apex of cercus.

Remarks. This species has the unique sex-combs consisting of thick, apically blunt teeth arranged in irregular transverse rows densely distributed over the entire lengths of the 1 st and 2nd tarsomeres and a few distal teeth on 3rd tarsomere of the male foreleg. The sex-combs of this species somewhat resemble those of L. neokurokawai , but differ in the follow points: teeth much thickened and apically blunt; transverse sex-combs dense and not clearly separated from each other, rather oblique on proximal portion of tarsomere. This species somewhat resembles L. piliferous in having the long, slender paramere and the large, differentiated spine at the ventral apex of cercus, but can be distinguished from it by the diagnostic characters, especially the unique sex-combs and the lack of apical hairs on the paramere.

Figures

FIGURE 13. Lordiphosa hamatispina sp. nov. (A−M: holotype #06027). A, B, sex-combs on right foreleg (lateral and ventral view, respectively); C, D, periphallic organs (caudal and caudolateral view, respectively); E, epandrial ventral lobe (lateral view); F, ventroapical spine of cercus (lateral view); G, surstylus and ventral spines of cercus (caudal view); H, inner surface of surstylus (caudolateral view); I, 10th sternite (ventral view); J̅L, phallic organs (ventral, ventrolateral, and lateral view, respectively); M, apical shape of paramere (lateral view).