Zaitzevia fengtongzhaiensis Jiang & Chen, 2023

Jiang, Ri-Xin & Chen, Xiang-Sheng, 2023, Three new species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from China, ZooKeys 1174, pp. 191-206 : 191

Zaitzevia fengtongzhaiensis Jiang & Chen sp. nov.

Figs 1B , 4 , 5 , 9E-G 蜂桶寨寥溪泥甲

Type material

(1 ♂, 1 ♀). Holotype: China: ♂, labeled 'China: Sichuan, Ya’an City (雅安市), Baoxing County (宝兴县), Fengtongzhai Township (蜂桶寨乡), Fengtongzhai N. R. (蜂桶寨国家级自然保护区), Dashuigou (大水沟), an unnamed stream, 30°35'18′′N, 102°52′24′′ E; H: 1505m, 23.07.2022, R.-X. Jiang & F.-E. L. leg.' (GUGC). Paratype: 1 ♀, with the same label data as the holotype (GUGC).

Description.

Male. Body elongately elliptical (Fig. 1B ), black with tarsi, tarsal claws and antennae reddish brown, femora and tibiae dark brown. Dorsal surface punctuated and weakly shiny, covered with sparse setae. Plastron setae are confined to following areas: head (both dorsal and ventral surface, except middle part of frons and clypeus), prosternum, outer part of elytra (include epipleura), outer parts of mesoventrite, metaventrite and abdomen (except median part) and surface of femora.

Head (Fig. 4A ), wider than long, dorsal surface (except middle part of frons) covered with plastron setae and large, sparse punctures, each puncture bearing a long seta, the interspaces between the punctures about twice the diameters of punctures. Clypeus evenly punctate with large punctures and covered with long, sparse setae, without plastron setae. Labrum transverse, shorter and slightly narrower than clypeus, covered with big punctures and long bristles at apical half, anterior margin almost straight and anterolateral angles rounded. Antenna short, with eight antennomeres, antennomere I slightly longer than wide, with several short setae; antennomere II slightly longer than antennomere I, strongly expanded, covered with several long setae, apical margin circled with short setae; antennomere III longer than wide; antennomeres IV-VII strongly transverse; antennomere VIII elliptical, elongate and strongly expanded, apex covered with dense long setae.

Pronotum (Fig. 4B ) wider than long, widest near basal 1/3. Anterior margin arcuate with angles moderately produced and acute. Lateral margins finely curved. Basal margin trisinuate, emarginate before scutellum, posterior angles near orthogonal. Surface shiny, finely covered with large punctures, each puncture bearing a long seta, punctures at basal 1/3 smaller and much denser than other parts; surface near apical angles microreticulate. Longitudinal impression distinct, about 2/3 length of pronotum, widest at middle; sublateral carinae from base to middle of pronotum, apical 1/2 slightly curved. Prosternal process (Fig. 4D ) with rounded apex, disc distinctly wrinkled, sides microreticulated.

Elytra (Fig. 4C ) about twice as long as wide, subparallel in basal 1/3, surface weakly wrinkled and covered with rows of long, sparse setae. Each elytron with granulate carinae on strial intervals 5, 7, and 8; other intervals flat. Area from intervals to lateral margin covered with dense short setae. Hind wings well developed.

Metaventrite (Fig. 4E ), disc shiny, covered with large, sparse punctures, each bearing a long seta, without plastron setae, sides covered with plastron setae. Median sulcus long and distinct, extending from posterior margin to ca. 4/5 of metasternum, widest at base and get narrowed anteriorly, base of median sulcus with a pair of small round impressions. Areas along coxal cavities with a series of shallow and anomalous impressions.

Disc of ventrites I-IV and anteriorly middle of ventrite V shiny, covered with sparse small punctures, without plastron setae; other areas of ventrites covered with plastron setae. Apical area of ventrite V granulated, apical margin distinctly emarginate at middle.

Legs simple, femora swollen, surface covered with plastron setae; inner half of tibiae with cleaning fringes; tarsi slightly shorter than tibiae; tarsal claws simple.

Aedeagus (Fig. 5A-D ), slender and elongate, median lobe nearly symmetrical, apex of median lobe acute, a pair of symmetrical and crescent-shaped sclerotizations located at apical 1/5 of median lobe, a pair of elongate and tortuous sclerotizations located at basal 1/2 of median lobe. Sternite IX (Fig. 5E ) with apical margin weakly emarginate, without seta, paraproct with basal slightly expanded and tortuous.

Measurements: CL: 3.51 mm; HL: 0.47 mm, HW: 0.57 mm; PL: 0.87 mm, PW: 0.96 mm; EL: 2.64 mm, EW: 1.32 mm.

Female: externally similar to the male, apex of sternite V rounded. Ovipositor as in Fig. 5F-H , stylus distinctly curved at base, apex with three short, finger-like sensilla; apex of coxite strongly roundly broadened at outer margin, without sensilla; valvifer about as long as coxite, fibula distinctly curved at basal 1/2, base weakly expanded. Measurements: CL: 3.46 mm; HL: 0.45 mm, HW: 0.58 mm; PL: 0.84 mm, PW: 0.90 mm; EL: 2.62 mm, EW:1.33 mm.

Distribution.

China: Central Sichuan Province.

Biology.

All adults were collected from a crack in the bottom of a stone in a small ravine stream (Fig. 9E-G ).

Etymology.

The specific epithet refers to the type locality, Fengtongzhai Nature Reserve, Sichuan Province; the name is treated as an adjective.

Comparative diagnosis.

Zaitzevia fengtongzhaiensis sp. nov. is similar to Zaitzevia chenzhitengi Jiang & Wang, 2020, Zaitzevia sichuanensis sp. nov. and Zaitzevia muchenae Bian & Zhang, 2022, and all four of these species share a similar habitus. The new species can be well distinguished from Z. chenzhitengi by the following characters: 1) different body size (> 3.30mm in the new species, 3.03-3.20 mm in Z. chenzhitengi ); 2) elytra weakly wrinkled (cf. distinctly wrinkled in Z. chenzhitengi ); 3) obviously different form of aedeagus (apex of median lobe arrowhead-like in Z. chenzhitengi , but simply acute in the new species). Compared with Z. sichuanensis sp. nov., areas between lateral margins and sublateral carinae not convex in the new species, and distinctly convex in Z. sichuanensis sp. nov., these two species also can be distinguished by the obviously different from of aedeagus (see Fig. 4A-F ). Zaitzevia fengtongzhaiensis sp. nov. can be distinguished from Z. muchenae by the following characters: 1) aedeagus of the new species is similar to Z. xiongzichuni Jiang & Wang, 2020, both species with a pair of crescent-shaped sclerotizations near apex of median lobe. However surface of Z. xiongzichuni shiny and not wrinkled. Median lobe of Z. xiongzichuni much slender, and weakly narrowed at middle, apical margin of sternite IX with a tuft of short setae, while median lobe of Z. fengtongzhaiensis sp. nov. is shorter and not narrowed at middle, and the apical margin of sternite IX is without setae.

Figures

Figure 1. Dorsal habitus of Zaitzevia species, males A Zaitzevia sichuanensis sp. nov. B Zaitzevia fengtongzhaiensis sp. nov. C Zaitzevia yingzuijieensis sp. nov. Scale bar: 1 mm.

Figure 4. Diagnostic features of Zaitzevia fengtongzhaiensis sp. nov. A head, dorsal view B pronotum, dorsal view C elytra D prosternal process E metaventrite. Scale bars: 1 mm (C); 0.25 mm (A, B, D, E). Note: red arrow of C granulate carinae of elytra; red arrow of E impressions and median sulcus of metaventrite.

Figure 5. Diagnostic features of Zaitzevia fengtongzhaiensis sp. nov. A aedeagus, dorsal view B ditto, lateral view C ditto, ventral view D ditto, meidan lobe, dorsal view E sternite IX F ovipositor G, H apical part of ovipositor. Scale bars: 0.5 mm (A-C, E, F); 0.2 mm (D, G); 0.1 mm (H).

Figure 9. Habitat of Zaitzevia species A general environment of the type locality of Z. sichuanensis sp. nov.: Lengmugou Geopark B ditto, microenvironment C general environment of paratype: Xilingxueshan D ditto, microenvironment E general environment of the type locality of Zaitzevia fengtongzhaiensis sp. nov.: Fengtongzhai Nature Reserve F ditto, microenvironment G living adult of Z. fengtongzhaiensis sp. nov.