Zaitzevia fodingshanus Jiang & Chen, 2025

Jiang, Ri-Xin, Yang, Lin, Long, Jian-Kun, Chang, Zhi-Min, Sun, Chuan-Liang, Feng, Xiao, Du, Mao-Heng & Chen, Xiang-Sheng, 2025, Additional new species of the genus Zaitzevia (Coleoptera, Elmidae) from China with an updated key to species from mainland China, ZooKeys 1258, pp. 199-212 : 199-212

publication ID	https://doi.org/10.3897/zookeys.1258.169390
publication LSID	lsid:zoobank.org:pub:73C68461-D3EC-4106-9193-FFDACB0372AF
DOI	https://doi.org/10.5281/zenodo.17532400
persistent identifier	https://treatment.plazi.org/id/15126497-F19F-5E12-B3D0-D4043247CBBF
treatment provided by	ZooKeys by Pensoft
scientific name	Zaitzevia fodingshanus Jiang & Chen
status	sp. nov.

Treatment

Zaitzevia fodingshanus Jiang & Chen sp. nov.

Figs 1 A View Figure 1 , 2 View Figure 2 , 3 (佛顶山寥溪泥甲 View Figure 3 )

Type material.

( 4 ♂♂, 4 ♀♀): Holotype: China: • ♂, labeled ‘ China: Guizhou, Tong ren City (铜仁市), Shiqian County (石阡县), Ganxi Township (甘溪乡), near Fuyan Village (扶堰村), Fodingshan National Nature Reserve (佛顶山国家级自然保护区), an unnamed stream, 27 ° 20 ' 56 " N, 108 ° 2 ' 22 " E; H: ~ 850 m, 15. 07. 2025, Ri-Xin Jiang leg. ’ ( GUGC). Paratypes GoogleMaps : • 3 ♂♂, 4 ♀♀, with the same label data as the holotype ( GUGC) GoogleMaps .

Description.

Male. Body elongately elliptical (Fig. 1 A View Figure 1 ), black, with tarsi, tarsal claws and antennae reddish brown, tibiae brown. Dorsal surface punctate and shiny, covered with sparse short setae. Plastron setae are confined to following areas: head (both dorsal and ventral surface, except discal portion; Fig. 2 A View Figure 2 ), prosternum (Fig. 2 C View Figure 2 ), outer part of elytra (include epipleura; Fig. 2 D View Figure 2 ), outer parts of mesoventrite, metaventrite (Fig. 2 C View Figure 2 ), abdomen (except median part) and surface of femora (Fig. 1 A View Figure 1 ).

Head (Fig. 2 A View Figure 2 ) wider than long, dorsal surface covered with dense short setae and sparse large punctures, each puncture bearing a long seta, short setae absent at discal portion, the interspaces between the punctures about 1–2 times the diameters of punctures. Clypeus evenly punctate with large punctures and covered with long, sparse setae, anterior portion microreticulate. Labrum transverse, shorter and slightly narrower than clypeus, covered with large punctures and long setae at lateral and apical margin, basal portion microreticulate, anterior margin weakly curved and anterolateral angles rounded. Antenna short, slightly clavate, with eight antennomeres, antennomere I slightly longer than wide, with several short setae; antennomere II about as long as antennomere I, distinctly 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 long, dense setae.

Pronotum (Fig. 2 B View Figure 2 ) slightly wider than long, widest near basal 2 / 5. Anterior margin arcuate with angles moderately produced and acute. Lateral margins finely curved. Basal margin trisinuate, emarginate before scutellum, posterior angles obtuse. Surface shiny, finely covered with large punctures, each puncture bearing a long seta, several pairs of small granules located at the middle of base of pronotum. Longitudinal impression short and shallow, longer than 1 / 3 length of pronotum, basal half wider than apical half; sublateral carinae extending from base to the middle of pronotum, apical 1 / 2 curved, lateral parts of sublateral carinae distinctly convex. Prosternal process (Fig. 2 C View Figure 2 ) with rounded apex, disc without plastron setae, surface distinctly wrinkled.

Elytra (Fig. 2 D View Figure 2 ) about twice as long as wide, nearly subparallel in basal 1 / 2, surface shiny and covered with long, sparse setae. Each elytron with granulate carinae on strial intervals 5, 7, and 8; other intervals flat. Area from interval 5 to lateral margin covered with short, dense setae. Hind wings well developed.

Mesothorax (Fig. 2 C View Figure 2 ), transverse, surface of disc hairless, with irregular impressions, middle of anterior portion hidden by prosternal process, sides of disc partly covered with plastron setae. Metaventrite (Fig. 2 C View Figure 2 ): surface of disc smooth, anterior portion of disc covered with small, sparse punctures, each bearing a short seta, posterior portion of disc covered with several large and round punctures, sides of disc partly covered with plastron setae. Median sulcus distinct, extending in posterior c. 2 / 3, narrower and shallower from base to apex, base of median sulcus wide and deep. Areas along coxal cavities and posterior margin of metaventrite with a series of anomalous impressions.

Disc of ventrites I – IV and anteriorly middle of ventrite V shiny, covered with small, sparse 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 side of distal halves of tibiae with cleaning fringes; tarsi slightly shorter than tibiae; tarsal claws simple and strong.

Aedeagus (Fig. 3 A – D View Figure 3 ), elongate, nearly symmetrical, apex of median lobe acutangulus, with two pairs of sclerites; a pair of them located at apical 1 / 8, wide and curved, becoming narrower from base to apex; another pair of sclerites much longer, about 2 / 3 length of median lobe. Parameres short, not fused with median lobe. Sternite IX (Fig. 3 E View Figure 3 ) with a tuft of short setae at middle of apical margin, paraproct with base curved.

Measurements ( N = 4): CL: 2.53–2.83 mm; HW: 0.47–0.51 mm; PL: 0.73–0.79 mm, PW: 0.83–0.87 mm; EL: 1.80–2.04 mm, EW: 1.13–1.18 mm.

Female: externally similar to the male, apex of sternite VIII rounded. Ovipositor as in Fig. 3 F – H View Figure 3 , stylus weakly curved at base, apex with several short finger-like sensilla; apex of coxite roundly broadened at outer margin, with several short and curved sensilla; valvifer longer than coxite, fibula weakly curved. Measurements ( N = 4): CL: 2.56–2.74 mm; HW: 0.48–0.54 mm; PL: 0.71–0.78 mm, PW: 0.83–0.86 mm; EL: 1.81–1.98 mm, EW: 1.11–1.25 mm.

Distribution.

China: Guizhou Province.

Biology.

All adults were collected from a small ravine stream (Fig. 6 A – C View Figure 6 ).

Etymology.

The specific epithet refers to the type locality, Fodingshan National Nature Reserve; the name is treated as an adjective.

Comparative diagnosis.

Zaitzevia fodingshanus sp. nov. is more or less similar to Z. tangliangi Jiang & Wang, 2021 from Hubei Province and Z. yingzuijieensis Jiang & Chen, 2023 from Hunan Province. All three species share a similar habitus, e. g., a smaller body size, and a shallow and short longitudinal impression of the pronotum. The new species can be easily distinguished from Z. tangliangi and Z. yingzuijieensis by the base of the pronotum with several pairs of small granules at middle (vs. with a pair of small foveae in the same position in Z. tangliangi and Z. yingzuijieensis ) and the very different form of the aedeagus (aedeagus much slenderer and the anterior pair of sclerites much smaller in Z. tangliangi and Z. yingzuijieensis ; Jiang and Wang 2021; Jiang and Chen 2023).