Unicornileptura laticollis 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 : 148-150

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

( Figs. 4–7 , 12, 13 , 15 )

Type material. Holotype: male, “ CHINA. Hubei, Yichang / Dalaoling / 1,570 m, 2020.V.19 / leg. Wen-Xuan Bi ( IZAS) . Paratypes: 3 males, 4 female, same data as holotype ( CBWX) ; 1 male, 1 female, same data as holotype ( EUMJ) ; 1 male, same locality as holotype, 2020.V.21, leg. Wen-Xuan Bi ( CBWX) ; 2 males, 1 female, ditto except 1,400 m, 2020.V.19, leg. J.-T. Zhao ( CCCC) ; 3 males, ditto except 2020.V.22, leg. J.-T. Zhao ( CCCC) .

Description. Male ( Fig. 4, 5 ). Length from tip of mandibles to elytral apices 8.9–11.0 mm, width at elytral humeri 1.9–2.4 mm.

Head, prothorax and scutellum blackish, sparsely clothed with yellowish hairs; elytra metallic greenish-blue, sparsely covered pale hairs which is longer than those on head; ventral surface blackish, densely clothed with silvery pubescence. Head with maxillary palpomeres dark brown; antennae light brown to dark brown, each flagellomere with relatively darker apices. Legs with coxae, trochanters, distal femora and basal tibiae blackish, of which dark area of femora and tibiae are variable as shown in Fig. 4 and 5 ; tarsi tawny to dark brown with tarsomeres I and II darkened apically; remainders tawny.

Head slightly narrower than 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; temples distinctly produced. Antennae with apical two antennomeres exceeding elytral midlength; 5th antennomere the longest, 1.5 times as long as scape, 1.3 and 1.6 times as long as 3rd and 4th respectively; relative lengths of antennomeres as follows: 0.86: 0.28: 1.00: 0.78: 1.31: 0.79: 0.92: 0.71: 0.73: 0.68: 0.86.

Pronotum distinctly transverse with gently rounded sides, about 0.8 times as long as the maximum width; apical margin nearly not collared; disk densely punctate as head but finer, with an indistinct median narrow longitudinal impunctate strip. Scutellum longer than basal width, rounded posteriorly.

Elytra about 3.5 times as long as the basal width across humeri, gradually narrowed from humeri to apical onefourth, then convergent toward conjointly rounded apices; disk provided with punctures which are sparser than those on pronotum. Ventral surface minutely punctate. Abdominal ventrite V trapezoidal with apical margin rounded.

Legs moderately long and slender; femora clavate; metafemora exceeding apical margin of abdominal ventrite III in ventral view.

Male genitalia. Tergite VIII ( Fig. 15a ) semi-trapezoidal, slightly shorter than basal width; both sides and narrowly rounded apical margin bears long setae. Tegmen ( Fig. 15b ) with lateral lobes strongly widened apically, then narrowed to obliquely truncate apices; apical setae short and sparse. Median lobe ( Fig. 15c ) subequal to tegmen in length; strongly curved near basal one-fourth in lateral view. Endophallus in inflated and non-everted condition similar to the preceding species as shown in Fig. 15d .

Female ( Figs. 6, 7 ). Length from tip of mandibles to elytral apices 9.4–11.2 mm, width at elytral humeri 2.0– 2.4 mm. Similar to male but body less slender; appendages relatively darker and shorter; femoral and tibial light-colored areas narrower; antennae hardly reaching elytral midlength; elytra subparallel sided in most of its length; abdominal ventrite V rounded triangular.

Etymology. From the combination of Latin lātus, meaning broad, and Latin collâris meaning neck, referred to the shape of the pronotum.

Distribution. China: Hubei.

Remarks. The coloration of the appendages of this new species is rather variable. This new species can be readily distinguished from the preceding new species by following features: head with hind angles of temples much strongly angulate; pronotum broader, broadest near middle instead of at base, lateral margins rounded instead of obtusely angulate; elytra not dehiscent; elytra relatively longer, especially in male that is 3.5 times as long as the basal width instead of 3.3 times; legs relatively shorter and stouter especially in male.

Figures

FIGURES 4–7. Habitus of Unicornileptura laticollis sp. nov. 4, 5, male; 6, 7, female.

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.