Zaitzevia muchenae, Bian & Zhang, 2022

Bian, Dongju & Zhang, Yi, 2022, Three new species of the genus Zaitzevia Champion, 1923 from China (Coleoptera Elmidae: Macronychini), Zootaxa 5190 (2), pp. 257-266 : 258

Zaitzevia muchenae sp. nov.

( Figs 1A–B , 3A–C , 5A )

Type materials. Holotype, male: “China-Yunnan \ Xishuangbanna | 1500m 11.1999 \ Leg. Wang & Wei” . Paratypes: 4 males, 4 females, the same data as holotype ; 2 males: “ China: Yunnan, Dali, \ Cang Moutains, \ Qingbi creek , | 100°08’ E 25°38’N, \ 2177 m, 2021. 7. 14. Leg. \ Bian & Tong” ; 1 male: “ China: Yunnan (25) \ Nujiang \ Lushui, Pianma | 98°38’54” E 26°0’26 \ Leg. Peng & Dong” .

Diagnosis. This species is similar to the Zaitzevia xiongzichuni Jiang & Wang, 2020 in habitus, but its body size is slightly larger than Z. xiongzichuni Jiang & Wang , its apex of penis looks like a “sub-triangle”, not cupidal. The new species also has the similar size with Zaitzevia chenzhitengi Jiang & Wang, 2020 , but is can be distinctly recognized from Zaitzevia chenzhitengi Jiang & Wang, 2020 by median sulcus of pronotum distinctly shorter, its apex of pennis sub-triangle, not arrowhead-like.

BL 3.3 mm long, BW 1.4 mm. Habitus see ( Figs 1A–B ). Body black, ventral side, femora and tibiae brown. Antennae yellowish-brown.

Head: labrum wider than long, basal half smooth and shining, without punctures and pubescence, distal half sparsely punctate and pubescent. Clypeus densely punctate and pubescent, sparsely granulate, anterior margin emarginate. Clypeal suture slightly impressed. Frons densely punctate and pubescent, and the granules denser than on the clypeus.

PL 0.9 mm, PW 1.0 mm, broadest at basal 0.4, slightly attenuated posteriorly and distinctly attenuated anteriorly. Anterior half of lateral margin serrate. Disc densely punctate, the area near the anterior angles densely granulated and pubescent. Sublateral carinae present in basal 0.4, bent outwards at basal 0.3. Median longitudinal sulcus a little broadened at middle, extending from basal 0.2 to 0.6. Base with three pair of small granules in front of the scutellum.

EL 2.4 mm, EW 1.4 mm. Elytra broadest at middle, slightly attenuated anteriorly and distinctly attenuated posteriorly. Strial punctures small, separated by 0.5–1.5 times of their diameters. Punctures smaller, and separated by 3–5 times of their diameters. Intervals 1–4 smooth and shining, only with few fine punctures sparsely arranged. The plastron presents from interval 5 to lateral margin. Intervals 5, 7, 8 carinate ( Fig. 5A ). Lateral margin serrate. Apices with some granules.

Prosternum densely pubescent. Prosternal process slightly narrowed from base to basal 0.8, then distinctly narrowed in distal 0.2; apex narrowly rounded; anterior half of the disc flat, smooth and shining, only with few fine punctures, posterior half distinctly impressed and coarse; lateral margin distinctly rimmed. Metaventrite broadly and distinctly impressed, smooth and shining, only with some small punctures and elongated granules; median groove distinctly impressed in posterior 0.8; two rows of large punctures, one is behind of the mesocoxa and the other one is in front of the metacoxa on each side; base with a pair of elongated deep pits medially; lateral sides densely pubescent, the pubescence with golden luster.

Ventrites I–V with disc smooth and shining, sparsely punctate, lateral sides of all the five ventrites densely pubescent and sparsely granulated. Posterior margin of ventrites III–IV finely and densely punctate, and densely pubescent. Apical margin of ventrite V emarginated medially, and each side with a group of yellowish long setae.

Aedeagus: 1.7 mm long, slender and elongate, cylindroid, penis about 2.2 times as long as phallobase. Penis subparallel in basal half, then slightly narrowly to basal 0.9, distal 0.1 distinctly narrowed and the shape looks like a “sub-triangle”; with a pair of sharp teeth at distal 0.2. Parameres absent.

Males: BL 3.2–3.5 mm, BW 1.3–1.5 mm (n=7). Females: BL 3.3–3.6 mm, BW 1.4–1.5 mm (n=2).

Distribution. China, Yunnan.

Etymology. This species is named after the Muchen Tong, who collected some type materials.

Figures

FIGURE 1. Habitus. A–B Zaitzevia muchenae sp. nov. C–D Z. reniformis sp. nov. A, C in dorsal view, B, D in ventral view.

FIGURE 3. Aedeagus: A–C Zaitzevia muchenae sp. nov.; D–F Z. reniformis sp. nov. A, D in vental view; B, E in dorsal view. D–F in lateral view.

FIGURE 5. Elytra. A Zaitzevia muchenae sp. nov B. Z. reniformis sp. nov. C. Z. gaoligongensis sp. nov.