Zaitzevia gaoligongensis, 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 : 260-265

Zaitzevia gaoligongensis sp. nov.

( Figs 2A–B , 4A–C , 5C )

Type Materials. Holotype, male: “ China: Yunnan (13) \ Baoshan City \ Gaoligong Moutains , | 98°47’32” E 25°18’36” N \, 1569 m, 2018.10.21 \ Leg. Peng, Zhu, Dong” . Paratypes: 2 males, the same data as holotype ; 1 male: “ China: Yunnan \ Nujiang, Lushui , | 98°53’27” E 26°25’31” N, \ 1061 m, 2018.10.27 \ Leg. Peng, Zhu, Dong” ; 3 males: “ China: Yunnan (17) \ Boashan, Mangkuan, Xinguang Vill. \ 98°50’53” E 25°41’6” N \ 2018.10.23, 1026 m \ Leg. Peng, Zhu, Dong” ; 2 males:“ China: Yunnan, Baoshan \ Gaoligong Moutains , | 98°47’37” E 25°18’32” N, \ 1514 m, 2018.10.21 \ Leg. Peng, Zhu, Dong” .

Diagnosis. This species is similar to Zaitzevia tsushimana Nomura in habitus and body size, but it can be distinguished from the latter by its median longitudinal sulcus of pronotum extending from basal 0.2 to 0.8, not reaching the base, by apex of penis more sharpened, and also by different shape of endophallus. This species can be distinguished from the similar sized species Z. parallela and Z. formosana Nomura by its median sulcus on pronotum not broadened at the middle. It can be distinguished from Z. rivalis by its aedeagus shorter, apex of penis more sharpened, and also by different shape of endophallus.

BL 2.2 mm, BW 1.0 mm. ( Figs 2A–B ). Body elongated obovate. Dorsal surface black, ventral side brown to black, femora, tibiae ferruginous, antennae, mouth part and tarsi yellowish brown.

Head: labrum wider than long, smooth and shining, sparsely punctate, each puncture with one long setae, anterior margin broadly rounded, not emarginate, each side with a group of long setae. Clypeus wider than long, anterior margin slightly indented, evenly punctate, with some small granules. Frons with disc similar to the clypeus, lateral sides somewhat coarse.

PL 0.6 mm, PW 0.75 mm. Pronotum broadest at basal 0.4, slightly attenuated anteriorly and posteriorly, lateral margin slightly serrated in basal half. Disc densely punctate, sparsely pubescent, the areas near anterior and posterior angles with some small granules. Sublateral carinae present in basal 0.4. Median longitudinal sulcus is narrow and shallow, not broadened at middle, extending from basal 0.2 to 0.8. Anterior angles sharp, slightly produced, posterior angles sub-rectangle. The area in front of the scutellum with some small granules.

EL 1.6 mm, EW 1.0 mm. Elytra broadest at basal 2/3, slightly attenuated anteriorly and distinctly narrowed posteriorly. Lateral margin serrated. Strial punctures small, separated by 1–2 times of its diameters in basal half, punctures smaller and well separated in distal half. Intervals 1-4 and basal area of intervals 5–7 smooth and shining, flat. Interval one with one longitudinal row of small punctures. From interval 5 to lateral margin densely pubescent. Intervals 5, 6, 7 carinate ( Fig. 5C ). The carina on intervals 5 extends from basal 0.1 to the apex, the other two carinae begin at base. Apices of elytra broadly rounded separately.

Prosternum densely pubescent, with some small granules. Prosternal process slightly narrowed from base to the apex, the apex broadly rounded, lateral margin distinctly rimmed; disc flat, smooth and shining, almost without punctures and pubescence. Disc of metaventrite broadly and deeply impressed, smooth and shining, only with few small punctures, not pubescent. Median sulus shallow, present almost in the whole length, lateral side densely pubescent, sparsely granulate. Each side with two rows of large punctures, one is behind of the mesocoxa, and the other one is in front of the metacoxa.

Disc of ventrites I–IV, and basal 0.2 of ventrite V smooth and shining, only with some small punctures, lateral sides of ventrites I–IV covered with dense golden pubescence, disc of ventrite 5 densely granulate and pubescent. Apical margin distinctly emarginated, each side with a group of long setae.

Aedeagus: 1.0 mm long, elongated, cylindrical, penis is 1.6 times as long as phallobase. Penis slightly broadened from base to basal 0.2, then subparallel from basal 0.2 to 0.6, slightly narrowed from basal 0.6 to 0.8, distinctly sharpened in distal 0.2, with a pair of apical teeth. Endophallus elongated, developed. Parameres completely confused to penis, the apices of parameres reaching the subapical part of the penis.

Males: BL 2.1–2.3 mm, BW 1.0 mm (n=8).

Distribution. China, Yunnan.

Etymology. This species is named after the type locality, Gaoligong Moutains in Yunnan Province, China.

Figures

FIGURE 2. Habitus. A–B Zaitzevia gaoligongensis sp. nov. C–D Z. chenzhitengi Jiang & Wang, 2020.A, C in dorsal view, B, D in ventral view.

FIGURE 4. Aedeagus: A–C Zaitzevia gaoligongensis sp. nov. D–F Z. chenzhitengi Jiang & Wang, 2020. 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.