Shirozuella limbata 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 : 187

Shirozuella limbata Tong & Wang , sp. n. (¶缘ĸ.瓢+)

Diagnosis. This species is close to Shirozuella tibetina Wang, Ge & Ren, 2012 in general appearance, but can be distinguished from the later by the black appearance ( Figs 2 A–C), and the relatively slender penis and penis guide ( Figs 2 E–F). In S. tibetina , the elytron is black with a curved yellowish brown spot situated between 2/5 and 4/5 elytral length to apex, and the penis and penis guide are stout.

Description. TL: 1.72 mm, TW: 1.22 mm, TH: 0.64 mm, TL/TW: 1.41; PL/PW: 0.43; EL/EW: 1.10.

Body small, elongate oval, weakly convex, dorsum covered with sparse pubescence ( Figs 2 A–C). Head black with maxillary palpus black. Pronotum black with anterior slightly brown. Scutellar shield black. Elytron black, with rather broad marginal rim. Ventral surfaces uniformly black, except elytral epipleura brown. Legs brown to black.

Head ( Fig. 2C ) 0.37 × elytral width (EW/HW=2.67); frontal surface of head capsule flattened and distal portion of head weakly produced anteriorly; punctures on frons fine, with sparse long setae in punctures; eyes relatively large, narrowly separated; widest interocular distance about 1.8 × narrowest interocular distance. Pronotum 0.68 × elytral width (EW/PW=1.48), pronotal punctures very fine, smaller than those on head, 1.0–2.0 diameters apart. Scutellar shield moderately large, triangular. Punctures on elytra moderately large, obviously larger than those on pronotum, 0.5–1.5 diameters apart.

Surface of prosternum matte, punctures inconspicuous, with sparse short setae. Mesoventrite matte and glabrous, punctures inconspicuous, with several short setae. Metaventrite broad and glabrous, median part concave, with complete median discrimen; punctures fine and sparse, with short sparse setae. Abdominal postcoxal line complete, touching posterior margin of ventrite 1 ( Fig. 2D ).

Male genitalia: Penis long and stout, strongly curved at basal 2/5 length, distinctly swollen at middle, penis capsule inconspicuous ( Fig. 2E ); penis guide in lateral view stout, widest at basal 3/5, apex pointed and curved ( Fig. 2F ); parameres slender, sparsely setose on apical half, distinctly longer than penis guide ( Fig. 2F ); penis guide in ventral view short and stout, parallel sided for basal 10/11, then narrowing sharply to pointed apex with a pair of small triangular projections on each side ( Fig. 2G ).

Female genitalia: unknown

Type material. Holotype: China, Yunnan: 1♂, Jizu Mountains, Binchuan, Dali (‡理×fflssƗm), 2116 m, 21.VIII.2013, Chen XS leg ( SCAU).

Distribution. China (Yunnan).

Etymology. The specific epithet limbata derives from the Latin word limbus (=marginal). It refers to the external borders of the elytra, which are rather explanate-reflexed. It is a noun in apposition.

Figures

FIGURE 2. Shirozuella limbata 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. Scale bars: A–C: 0.5 mm; D–G: 0.1 mm.