Scolytocis multispinus, Mo & Xu, 2022

Mo, Da-Rui & Xu, Ji-Shan, 2022, Two new species of the tribe Xylographellini (Coleoptera: Ciidae) from Yunnan Province, China, Zootaxa 5219 (3), pp. 295-300 : 298-300

Scolytocis multispinus sp. nov.

Figs. 9–18

Chinese vernacular name: Øḏffiff木ϕφ

Type material (21exx.). HOLOTYPE: CHINA: male, “China: Yunnan, Dali Bai Autonomous Prefecture, Nanjian County, Wuliang Mountain , 24°45′1″N, 100°30′1″E, 2350 m, 03.viii.2020, leg. Ji-Shan Xu, Da-Rui Mo & Juan Shao”. PARATYPES : CHINA: 8 males, 12 females, same data as the holotype .

Diagnosis. The species belongs to the zimmermani species-group characterized by tibiae expanded to the middle, with the outer edge broadly rounded and with spines very close to each other at the apical half. The species differs from Sc. danae (Yunnan, China) by body size ( Sc. danae > 2.40 mm, Sc. multispinus sp. nov. <2.00 mm) and first abdominal ventrite of the male devoid of sex patch. It differs from Sc. thayerae and Sc. zimmermani by head and pronotum without cuticular globules; elytral apex bearing conspicuous cuticular globules (best seen in lateral view), and distributed dense punctures. And it differs from Sc. philippinensis by without a conspicuous longitudinal carina in front of coxae. Additionally, this species differs from all the other known species (excluding the Sc. zimmermani species-group) by the number of spines on metatibia (around 40 v.s. 10–25).

Description. Male ( Figs. 9–13, 16–18 ). Fully pigmented adult. Measurements in mm: TL 1.91, PL 0.62, PW 0.77, EL 1.26, EW 0.88, GD 0.80. Ratios: PL/PW 0.81, EL/EW 1.43, EL/PL 2.03, GD/EW 0.91, TL/EW 2.17. Body elongate, convex, dorsal dark yellowish brown, with minute setae, barely visible; ventral with fine and long setae, yellowish brown; antennae, palpi and legs yellowish brown. Head without cuticular globules, but with shallow and fine punctures, the surface between punctures smooth. Antennae ( Fig. 12 ) bearing nine antennomeres with the following lengths (in mm, left antenna measured): 0.16, 0.05, 0.06, 0.02, 0.02, 0.01, 0.06, 0.05, 0.09 (FL 0.11 mm, CL 0.20 mm, CL/FL 1.82). Compound Eyes finely facetted, each bearing approximately 90 ommatidia; GW 0.18 mm. Pronotum without cuticular globules, but with dense, coarse and shallow punctures, which coarser and denser than elytra, the surface between them smooth; anterior margin broadly rounded, not projected forward; sides not explanate and smooth, barely visible from above; posterior edge broadly rounded, without a rugose border. Scutellar shield well-developed, triangular, smooth; BW 0.14 mm. Elytra with minute setae, punctuation shallow, sparse and fine, the surface between punctures smooth; elytral apex truncate, the punctures were denser and coarser, slightly concave when seen from above, bearing sparse and conspicuous cuticular globules (best seen in lateral view). Prosternum in front of coxae biconcave, slightly tumid at midline but not carinate, punctures indiscernible; sides with fine and long setae; prosternal process small, laminate. Mesoventrite with coarse and shallow punctures. Metaventrite tumid at middle, extremely convex, with discrimen being half the length of the ventrite; ventrite with fine and long setae, punctuation shallow and coarse, they are concentrated at from the anterior portion to half. Protibia outer edge straight to slightly expand and with spines at the apical two-thirds; inner margin with a narrow tuft of long bristles at the apical third. Meso- and metatibia ( Fig. 13 , left metatibia of a paratype) with similar shape and length, approximately three as long as broad; expanded from apex to apical two-thirds of their lengths and with outer edge broadly rounded, almost covered spines, dense at apical three-eighths and then getting sparser. Abdominal ventrites with minute setae, punctation shallow and coarse; punctation of abdominal ventrites II–IV concentrated at the transverse midline; sides of first abdominal ventrites with shallow, coarse and sparse punctures, but dense in the middle, without sex patch; abdominal ventrites V cover shallow and coarse punctures; length of the ventrites (in mm) as follows: 0.21, 0.08, 0.08, 0.08, 0.15. Male abdominal terminalia in a paratype ( Figs. 16–18 ): sternite VIII with posterior angles bearing a few long setae, sides with a few short setae. Tegmen ( Fig. 17 ) long, rounded apically, membranous laterally in basal half, sclerotized in apical half. Penis ( Fig. 18 )subparallel and sclerotized laterally, membranous in the middle.

Female. Similar to male in external morphology. Female abdominal terminalia in a paratype ( Figs. 14–15 ): ventral lobe of gonocoxites inconspicuous, devoid of gonostyli; proctiger with apical margin membranous in the middle and bearing several long setae laterally; paraprocts membranous, transparent; baculi of paraprocts and proctiger both slender, apex with three setae; spiculum ventrale slightly curved in the middle.

Measurements. Males (n = 9, including the holotype; in mm): TL 1.72–1.99 (1.84 ± 0.08); PL 0.58–0.68 (0.63 ± 0.04); PW 0.71–0.84 (0.76 ± 0.03); EL 1.10–1.27 (1.18 ± 0.05); EW 0.81–0.90 (0.85 ± 0.03); GD 0.75–0.83 (0.79 ± 0.02). Ratios: PL/PW 0.77–0.87 (0.82 ± 0.03); EL/EW 1.34–1.45 (1.39 ± 0.04); EL/PL 1.69–2.05 (1.89 ± 0.12); GD/EW 0.90–0.96 (0.93 ± 0.02); TL/EW 2.11–2.21 (2.17 ± 0.04). Females (n = 12; in mm): TL 1.39–1.80(1.66 ± 0.12); PL 0.53–0.65 (0.58 ± 0.03); PW 0.60–0.76 (0.70 ± 0.04); EL 0.84–1.16 (1.04 ± 0.11); EW 0.68–0.87 (0.79 ± 0.05); GD 0.62–0.68 (0.65 ± 0.02). Ratios: PL/PW 0.79–0.90 (0.84 ± 0.04); EL/EW 1.16–1.45 (1.31 ± 0.09); EL/PL 1.48–2.13 (1.78 ± 0.18); GD/EW 0.78–0.91 (0.82 ± 0.04); TL/EW 1.99–2.21 (2.09 ± 0.06).

Distribution. Wuliang Mountain, Yunnan, China.

Host fungi. Unidentified Polyporaceae .

Etymology. The specific name ‘ multispinus’ refers to the many spines on metatibia.

Figures

FIGURES 9–18. Scolytocis multispinus sp. nov. (9–12) holotype; (13–18) two of the paratypes. (9–11) dorsal, lateral, and ventral views; (12) left antenna, ventral view; (13) left metatibia, ventral view; (14–15) female abdominal terminalia, ventral view; gonocoxites (gc), paraprocts (pp) and spiculum ventrale (sv); (16) male abdominal terminalia, lateral view; (17) tegmen (teg), dorsal view; (18) penis (pen), dorsal view. Scale bars: 1 mm (Figs. 9–11); 0.1 mm (Figs. 12–18).