Zaitzevia reniformis, 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 : 258-260

Zaitzevia reniformis sp. nov.

( Figs 1C–D , 3D–F , 5B )

Type materials. Holotype, male: “ China: Yunnan (15) \ Baoshan, Mangkuan \ Sandieshui | 98°50’16” E 25°26’25” N \ 1135 m, 2018.10.22 \ Leg. Peng, Zhu, Dong” . Paratypes, 2 males, the same data as holotype ; 9 males, 4 females: “ China: Yunnan (17) \ Boashan, Mangkuan , Xinguang Vill. \ 98°50’53” E 25°41’6” N \ 2018.10.23, 1026 m \ Leg. Peng, Zhu, Dong.”

Diagnosis. This species is similar to Zaitzevia nitida Nomura in habitus and body size, but it can be distinguished from the latter by median longitudinal sulcus distinctly shorter, apex of penis is not sharp, lateral view of penis distinctly curved, and also by the kidney-liked shape of the endophallus. This species is different from other small species in genus Zaitevia by its shorter median longitudinal sulcus, and by different shape of male gentalia.

BL 1.90 mm, BW 0.75 mm. Habitus see ( Figs 1C–D ). Body elongated, dorsal surface, femora, tibae black, ventral side dark brown to black, antennae and tarsi yellowish brown.

Head: labrum wider than long, smooth and shining, basal 2/3 sparsely punctate and pubescent, anterior margin broadly rounded, lateral margin with long setae. Clypeus slightly wider than long, sparsely punctate and pubscent, lateral sides with some granules. Clypeal suture straight, shallowly impressed. Frons similar to the clypeus.

PL 0.5 mm, PW 0.6 mm. Pronotum broadest at basal 0.4, then slightly attenuated anteriorly and posteriorly. Disc smooth and shining, punctures sparsely and evenly distributed, only with few short setae. Anterior angles sharp, slightly produced, posterior angles rectangle. Sublateral carinae obsolete. Sublateral grooves tilt inwards in basal 0.3, then bent outwards from basal 0.3 to 0.7. Median longitudinal sulcus very narrow and shallow, slightly broadened at middle, extending from basal 0.4 to 0.6.

EL 1.4 mm, EW 0.75 mm. Elytra subparallel in basal 2/3, the distinctly attenuated in distal 1/3. Apices not conjointed. Strial punctures on disc small, separated by 0.5–1.5 times of their diameters, and the punctures becoming finer and well separated in distal half. Intervals I-IV flat, smooth and shining, interval 1 with a longitudinal row of fine punctures, intervals 2–4 almost without punctures and pubescence. Intervals 5, 6, 7 carinate ( Fig. 5B ). Lateral margin serrate. The area between carinae on interval 5 to lateral margin with plastrons, except the basal area of intervals 5, 6.

Prosternum with disc smooth and shining, sparsely punctate and pubescent, lateral area densely pubescent. Prosternal process with disc coarse, without pubescence. Lateral margin distinctly rimmed, subparallel basal 0.8, distal 0.2 distinctly narrowed; apex narrowly rounded. Metaventrite with disc broadly and deeply impressed, smooth and shining, almost without punctures and pubescence; lateral area densely pubescent; median groove present in basal 0.7; two rows of large punctures on each side, one is behind the mesocoxa and the other one is in front of the metacoxa.

Disc of ventrites I–V smooth and shining, sparsely punctate, almost without pubescence, lateral area of ventrites I–V densely pubescent. Apex of the ventrite V emarginated, with some small granules and a group of long setae at each side.

Aedeagus. 0.8 mm long. Penis about 1.3 times as long as phallobase, sub-paralleled in basal half, then slightly narrowly in distal half. Apex broadly rounded. Ventral sac not developed. Endophallus not developed, and the shape looks like a pair of “kidney”-liked near the middle in ventral view. Parameres completely confused to penis, only can see the trace near the middle

Males: BL 1.7–2.0 mm, BW 0.7–0.8 mm (n=11). Females: BL 1.7–1.9 mm, BW 0.7–0.8 mm (n=3).

Distribution. China, Yunnan.

Etymology. The epithet is derived from the Latin adjective “reniformis” (reniform) and refers to the shape of the endophallus.

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.