Shirozuella poststigmaea Tong & Wang, 2019

Tong, Junbo, Zhang, Xiaoning, Chen, Xiaosheng & Wang, Xingmin, 2019, Three new species of Shirozuella Sasaji (Coleoptera, Coccinellidae) from China, Zootaxa 4615 (1), pp. 185-191 : 188-190

Shirozuella poststigmaea Tong & Wang , sp. n. (ϊκĸ.瓢+)

Diagnosis. This species is close to S. tibetina in general appearance, but can be distinguished from the later as follows: pronotum is uniformly black ( Fig. 3C ), elytron is black with a small yellowish brown spot situated between 3/5 and 4/5 elytral length to apex ( Fig. 3A ), and penis and penis guide are relatively slender ( Figs 3 E–F). The penis guide in ventral view is parallel sided for basal 3/4, then gradually narrowing to a blunt apex ( Fig 3G ). In S. tibetina , the pronotum is black with the anterior slightly brown, elytron is black, with a curved yellowish brown spot situated between 2/5 and 4/5 elytral length to apex. The penis is short and stout. The penis guide in lateral view is stout and widest at the basal 2/5, with the apex pointed and curved.

Description. TL: 1.54–1.99 mm, TW: 1.04–1.38 mm, TH: 0.65–0.92 mm, TL/TW: 1.42–1.48; PL/PW: 0.42– 0.47; EL/EW: 1.13–1.20.

Body small, elongate oval, weakly convex. Dorsum covered with sparse pubescence ( Figs 3 A–B). Head black, maxillary palpus dark brown. Pronotum black. Scutellar shield dark brown. Elytron black, with a yellowish brown spot situated between 3/5 and 4/5 elytral length to apex. Ventral surfaces uniformly black, except elytral epipleura brown. Legs brown with tibia and tarsi yellow.

Head ( Fig. 3C ) 0.41 × elytral width (EW/HW=2.43); frontal surface of head capsule flattened and distal portion of head weakly produced anteriorly; punctures on frons fine and dense, with sparse long setae in punctures; eyes relatively large, distinctly broader than interocular distance; widest interocular distance about 1.6 × narrowest interocular distance. Pronotum relatively small, 0.68 × elytral width (EW/PW=1.46), pronotal punctures fine, smaller than those on head, 0.5–1.5 diameters apart. Scutellar shield triangular. Punctures on elytra larger than those on pronotum, 1.0–2.5 diameters apart.

Prosternum and mesoventrite slightly shagreened, punctures inconspicuous, with sparse short setae. Metaventrite broad and pubescent, median part concave, with complete median discrimen; punctures dense and moderately large, with short setae. Abdominal postcoxal line complete, almost touching posterior margin of ventrite 1 ( Fig. 3D ).

Male genitalia: Penis relatively short and slender, penis capsule inconspicuous ( Fig. 3E ); penis guide in lateral view slender, widest at base, tapering to apex, apex pointed and curved ( Fig. 3F ); parameres slender, sparsely setose at apical 2/3, and sharply thinned in apical 1/2, much longer than penis guide ( Fig. 3F ); penis guide in ventral view parallel sided for basal 3/4, then gradually narrowing to a blunt apex ( Fig. 3G ).

Female genitalia: Coxites elongate, subtriangular, 3.2 × as long as wide, tapering to blunt, darker apices, styli distinct, each with short terminal setae ( Fig. 3H ); spermatheca not sclerotized.

Type material. Holotype: China, Yunnan: 1♂, Liuku (Àι), 1.IX.2005, Wang XM leg. ( SCAU) . Paratypes: Yunnan: 2♀♀, Weibao Mountains, Dali (‡理巍tm), 2210 m, 15.VIII.2013, Chen XS and Huo LZ leg ( SCAU); 1♀, Wuliang Mountains , Jingdong (ƚr±Ιm), ca 2400 m, 18.VIII.2008, Wang XM et al. leg ( SCAU).

Distribution. China (Yunnan).

Etymology. The specific epithet poststigmaea derives from the Latin words post (= posterior) and stigmaeus (= spotted), referring to the apical spot on each elytron. It is a noun in apposition.

Figures

FIGURE 3. Shirozuella poststigmaea sp. n.: A) adult, dorsal view, B) adult, lateral view, C) adult, frontal view, D) abdomen, E) penis, F) tegmen, lateral view, G) tegmen, ventral view, H) female genitalia: ovipositor. Scale bars: A–C: 0.5 mm; D–H: 0.1 mm.