Unicornileptura emeiensis Bi, Chen & N. Ohbayashi, 2022

Bi, Wen-Xuan, Chen, Chang-Chin & Ohbayashi, Nobuo, 2022, Unicornileptura gen. nov., a unique lepturine genus from China (Coleoptera, Cerambycidae, Lepturinae, Lepturini), Zootaxa 5129 (1), pp. 145-150 : 146-148

Unicornileptura emeiensis Bi, Chen & N. Ohbayashi sp. nov.

( Figs. 1–3 , 8–11 , 14 )

Type material. Holotype: male, “ CHINA. Sichuan, Emeishan / Jiulingang / 1,800- 1,740 m, 2017.VI.1-2 / leg. Wen- Xuan Bi” ( SNUC) . Paratypes: 1 female, same data as holotype ( CBWX) ; 2 females, same locality as holotype, 2017.V.30-31, leg. Wen-Xuan Bi ( CBWX) ; 1 male, 1 female, Sichuan, Emeishan, Chudian , 1,700 m, 2017.V.23, leg. Wen-Xuan Bi ( CBWX) ; 4 males, 1female, ditto except 1,563 m, 2017.VI.1, leg. Xiao-Dong Yang ( CCCC & EUMJ) ; 1 female, Sichuan, Emeishan, Yuxiansi , 1,600 m, 2017.V.20, leg. Wen-Xuan Bi ( CBWX) .

Description. Male ( Fig. 1 ). Length from tip of mandibles to elytral apices 8.4–8.5 mm, width at elytral humeri 1.8–1.9 mm.

Head, prothorax and scutellum blackish, clothed with tawny hairs which are relatively denser on pronotum; elytra light metallic green, sparsely covered with similar hair as head but longer and lighter in color; ventral surface blackish, moderately clothed with silvery pubescence. Head with maxillary palpomeres dark brown; antennae with scape and pedicel dark brown, flagellomeres brownish with darker apices. Legs with coxae, trochanters, distal femora, basal tibiae and tarsi blackish; remainders tawny.

Head nearly as wide as pronotal base; surface mostly provided with coarse reticulate punctures, except for the area behind the cranial horn and gulamentum which are smooth; genae very short, less than one fourth of longitudinal eye diameter; temples weakly produced, sloping obliquely backwards from the rear edge of the eyes; terminal segment of maxillary palpomere 1.5 times as long as penultimate segment. Antennae slender, apical two antennomeres exceeding elytral midlength; 5th antennomere the longest, 1.3 times as long as scape or 3rd antennomere, 1.5 times as long as 4th; relative lengths of antennomeres as follows: 0.97: 0.30: 1.00: 0.84: 1.28: 0.72: 0.84: 0.60: 0.72: 0.63: 0.82.

Pronotum trapezoidal with obtusely angulate sides, 0.9 times as long as basal width; 1.2 times as wide as apical width; apical margin vaguely collared; disk coarsely punctate as head. Scutellum longer than basal width, rounded posteriorly.

Elytra about 3.3 times as long as the basal width across humeri, gradually narrowed from humeri to apical two-third, then convergent toward slightly dehiscent and rounded each apex; disk provided with punctures which are finer and sparser than those on head and pronotum. Ventral surface minutely punctate. Abdominal ventrite V trapezoidal with apical margin rounded.

Legs long and slender; femora moderately clavate; metafemora almost extending apical margin of abdominal ventrite IV in ventral view; meso- and metatibiae weakly curved inwards near apical one-third.

Male genitalia. Tergite VIII ( Fig. 14a ) trapezoidal, distinctly shorter than basal width; both sides and semitruncate apical margin bears long setae. Tegmen ( Fig. 14b ) with lateral lobes gradually widened apically, then narrowed to subacute apices, 0.4 times as long as the whole length of tegmen, slightly curved inward near apical one-fourth in lateral view; apical setae short and sparse. Median lobe ( Fig. 14c ) 1.1 times as long as tegmen, curved near basal one-third in lateral view; ventral plate moderately pointed at apex; median struts distinctly shorter than one-fourth of the whole length. Endophallus in inflated and non-everted condition ( Fig. 14d ) ca. 2.3 times as long as median lobe; roughly straight; slender in basal half, thence gradually expanded to form a dorsal tubercle near apical one-third, then abruptly constricted dorsally near apical one-fourth; preapical bulb well developed.

Female ( Figs. 2, 3 ). Length from tip of mandibles to elytral apices 8.1–10.0 mm, width at elytral humeri 1.8–2.4 mm. Almost identical to male in general appearance, rarely with the appendages and elytra relatively darker as shown in Fig. 3 . Body less slender; antennae and legs relatively short, last antennomere reaching elytral midlength; elytra subparallel sided in most of its length; abdominal ventrite V rounded triangular.

Etymology. The new species is named after its type locality.

Distribution. China: Sichuan.

Figures

FIGURES 1–3. Habitus of Unicornileptura emeiensis sp. nov. 1, male; 2, 3, female. a, dorsal view; b, ventral view.

FIGURES 8–13. Head and pronotum of Unicornileptura spp. 8–11, U. emeiensis sp. nov.; 12,13, U. laticollis sp. nov. 8, 9, head in lateral view (a) and frontal view (b); 10–13, pronotum in dorsal view. 8, 10, 12, male; 9, 11, 13, female.

FIGURES 14–15. Terminalia of male of Unicornileptura spp. 14, U. emeiensis sp. nov.; 15, U. laticollis sp. nov. a, tergite VIII with sternites VIII & IX in ventral view; b, tegmen in ventral view and lateral view; c, median lobe in ventral view and lateral view; d endophallus in inflated and non-everted condition in ventral view. a, b, c, scale = 1 mm; d, not to scale.