Immanus songi, Lin & Li & Meng, 2023

Lin, Wei, Li, You & Meng, Ling-Zeng, 2023, First record of the genus Immanus Hulcr & Cognato (Coleoptera: Curculionidae: Scolytinae: Xyleborini) from China, with description of a new species, Zootaxa 5352 (3), pp. 433-438 : 434-436

Immanus songi sp. nov.

( Fig. 1A‒H )

Type material. Holotype, female, CHINA. Yunnan Prov., Xishuangbanna Dai Autonomous Prefecture, Jinghong city, Jinuo Mts. 22.0603°N, 100.6844°E, ca 1340m, 07.VIII.2022, leg. local villager (deposited in the Museum of Biology , Sun Yat-sen University, Guangzhou, China).

Diagnosis. Pronotum with the anterior margin prolonged forward and bearing four asperities, the middle pair slightly larger; declivity steep, nearly obliquely truncate, striae deeply impressed, strial punctures much larger than on disc; declivital interstriae impunctate, bearing 2 or 3 irregular rows uniformly granules along entire length, each granule bearing a long, recumbent hair-like seta.

The species is most similar to Immanus virago Wang, Smith & Cognato, 2020 , but can be distinguished by the smaller size (6.1 mm vs. 7.8 mm), interstriae bearing more rows of granules along entire length (2 or 3 rows vs. 1 row).

Description (Female). 6.10 mm long, 1.88 times as long as wide. Color. Body uniformly brown, except latter half of elytra dark brown. Head. Frons moderately convex with a slightly linear depression, shining between the eyes, with fine and sparse punctures, with a fringe of long setae concealing epistoma, punctures larger on upper part of frons, each bearing a long, erect seta. Eyes large, moderately emarginate, upper part smaller than lower. Submentum shallowly impressed, narrowly triangular and with a row of long hair-like setae. Antennal scape clubshaped, about 1.5 times as long as five-segmented funicle (including pedicel), first segment bowl-shaped, second segment slightly longer than wide, third to fifth segments transverse, gradually increasing in width. Club of equal height and width, type 3 ( Hulcr et al. 2007), flat, anterior face with segment 1 corneous, smaller than segment 2, segments 1 and 2 visible on posterior face, corneous. Pronotum. 1.26 times wider than long, rounded in dorsal view, type 1 ( Hulcr et al. 2007), with the anterior margin prolonged forwards and bearing four asperities, the middle pair is slightly larger; tall in lateral view, type 3 ( Hulcr et al. 2007). Anterior slope with scaly asperities, becoming smaller towards summit, summit at basal one-third of pronotum, a ridged midline between summit and base. Disc with smaller and lower asperities behind summit on median area, and surface becoming smooth and shining towards posterior angles, where moderately finely punctate and each with long, erect seta. Posterior angle of pronotum rounded, lateral margin costate. Base almost straight. Vestiture of long, erect or semi-recumbent hair-like setae, point to summit. Scutellum. Linguiform, longer than wide, flat, impunctate, flush with elytra. Elytra. 1.11 times longer than wide, 1.44 times longer than pronotum. Elytral bases straight, humeral angles rounded. Sides almost straight but slightly concave at the fifth of the base, slightly widening from base to declivity, broadly rounded to apex. Disc a little longer than declivity, distinctly separated and flat; striae impressed, with small, shallow punctures separated by 0.5‒1 times the width of a puncture, each puncture bearing a short, recumbent hair-like seta; interstriae shining, very wide, 5‒7 times as wide as adjacent striae, flat, with 2 or 3 irregular rows of fine punctures, each bearing a long, erect or semi-erect hair-like seta. Declivity occupying almost 1/2 of elytra, steep, subcircular, nearly obliquely truncate, upper half of face slightly impressed and lower half convex; striae and interstriae easily distinguishable, striae obviously impressed, strial punctures much larger than on disc, strial setae shorter than a puncture; interstriae 2 or 3 times as wide as adjacent striae, impunctate, bearing 2 or 3 irregular rows of uniform granules along entire length, each granule bearing a long, recumbent hair-like seta, setae at interstriae 1 obliquely directed outward, setae at interstriae 2‒6 directed to the mid-declivity, six striae visible on declivital face, striae 4 and 5 meet at apical 1/3; granulate costa extending to interstriae 7. Legs. Procoxae contiguous, prosternal piece conical. Protibiae triangular, broadest at apical 1/4, apical spur strong, curved outward, apical 1/2 of outer margin with two large and two small teeth, posterior face flat, not granulate. Meso- and meta-tibiae very broadly triangular, with a series of 10 reduced teeth on the apical 1/2 of outer margin. First tarsomere as long as the next two together, the 4 th tarsomere very short, the sum of the 4 th and the 5 th tarsomere is approximately equal to the basal three tarsomere, ventral side of basal three tarsomeres with brushes of dense setae.

Male. Unknown.

Etymology. The new species is dedicated to Dr. Song Haitian (Fujian Academy of Forestry Sciences), who provided the holotype.

Distribution. China (Yunnan Province).

Biology. Unknown.

Figures

FIGURE 1. Holotype female of Immanus songi sp.nov. A dorsal view B lateral view C declivity D front E protibia (posterior side) F mesotibia (anterior side) G metatibia (anterior side) H antenna.