taxonID	type	description	language	source
F71BA7B71D295530809672D840A5AD95.taxon	description	Figs 4 A, B, 10 D – F	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
F71BA7B71D295530809672D840A5AD95.taxon	distribution	Distribution. Shaanxi, Sichuan, Yunnan.	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
C97BBB869AEE5623AF73446170D26E7A.taxon	description	Figs 2 C, D, 7 A – C, 11 D – F	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
C97BBB869AEE5623AF73446170D26E7A.taxon	description	Description. Male (holotype). Body broadly obovate. BL 2.6 mm, BW 1.2 mm. Antennae yellowish brown, dorsum black, ventral side brown to black, legs reddish brown to dark brown except tarsi light brown. Labrum microreticulate in basal 0.1, distal 0.9 smooth and shiny, sparsely punctate and pubescent. Anterior margin broadly rounded, not emarginate, densely pubescent laterally. Clypeus coarse, densely pubescent, sparsely granulate. Frons densely pubescent, with a few small granules near inner sides of eyes. Pronotum (PL 0.7 mm, PW 0.9 mm) broadest at base, gradually narrowing anteriad. Lateral margin slightly rimmed. Anterior corners acute, slightly produced, posterior corners right-angled. Disc smooth and shiny, densely punctate, and sparsely pubescent. Area near anterior and posterior corners and in front of scutellum coarse, finely granulate. Median sulcus reaching from basal 0.2 – 0.5, narrow, not broadened medially. Sublateral carinae extending from base to basal 0.4, slightly raised. Elytra (EL 1.9 mm, EW 1.2 mm) broadest at distal 0.33, slightly narrowed anteriorly and distinctly attenuate posteriorly. Strial punctures moderately large, especially in the middle area, separated by ~ 0.5 – 1.0 × their diameters, becoming smaller and shallower towards declivity, separated by 2 – 3 × their diameters. Intervals flat, more or less smooth and glabrous, hardly punctate, and hardly pubescent. Intervals 5, 7 and 8 carinate; carinae on interval 5 extending from basal 0.2 to apex; carinae on intervals 7 and 8 extending from basal 0.1 to apex. Elytral apices densely granulate, separately rounded (in posterior view). Prosternum laterally densely pubescent; prosternal process gradually narrowed from base to distal 0.2, distinctly narrowed in distal 0.2, apex narrowly rounded, lateral margin distinctly rimmed; disc coarse with some large granules, sparsely punctate. Disc of metaventrite broadly and distinctly impressed, smooth and shiny, with a few very small punctures and large granules; with a row of large punctures behind of mesocoxa and another row of small punctures in front of metacoxa; median sulcus complete, gradually narrowing anteriad; lateral margin of disc in the median part (between meso- and metacoxae) with a large hump covered with a few distinct granules; lateral areas densely pubescent and sparsely granulate. Ventrite I moderately densely punctate, with a pair of admedian carinae; disc more or less impressed, anterior margin raised. Middle of ventrites II – IV smooth and shiny, sparsely and finely punctate. Lateral areas of ventrites I – V densely pubescent. Ventrite V densely pubescent and sparsely granulate; lateral margins V fringed with short spines; apical margin weakly emarginate medially; lateral corners not forming distinct teeth. Protibiae slightly enlarged. Aedeagus. 1.2 mm long, elongate, cylindrical. Penis ~ 1.9 × as long as phallobase, gradually broadened in basal 0.33, then almost subparallel to basal 0.67, distinctly acuminate in distal 0.33, apex acute. Endophallus with characteristic sclerotizations resembling a crown. Parameres very slim, reaching apical 0.2 of penis. Females. Metaventrite not distinctly impressed; pair of humps between meso- and metacoxae smaller, without granules. Disc of ventrite I glabrous, very sparsely punctate, partly and faintly microreticulate, concave in posterior 0.5. Apex of ventrite V straight or weakly rounded, not emarginate. Protibiae not enlarged.	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
C97BBB869AEE5623AF73446170D26E7A.taxon	description	Measurements. Males: BL 2.50 – 2.65 mm (n = 10), BW 1.1 – 1.2 mm (n = 6); females: BL 2.3 – 2.7 mm (n = 10), BW 1.1 – 1.2 mm (n = 5).	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
C97BBB869AEE5623AF73446170D26E7A.taxon	distribution	Distribution. Hubei, Shaanxi.	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
C97BBB869AEE5623AF73446170D26E7A.taxon	etymology	Etymology. The epithet is derived from the Latin noun coronifer (carrier of a crown) and refers to the crown-like sclerotizations of the endophallus.	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
5B246B76E0325B2EA681F05C9119A4AC.taxon	description	Figs 3 A, B, 8 A – C, 12 A – C	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
5B246B76E0325B2EA681F05C9119A4AC.taxon	description	Description. Male (holotype). BL 1.8 mm, BW 0.8 mm. Body elongate obovate. Dorsum and ventral side dark brown, antennae yellowish brown. Legs dark brown but tarsi reddish brown. Labrum wider than long. Basal 0.33 microreticulate, distal 0.67 densely punctate and pubescent, with fringe of long setae laterally. Clypeus and frons densely pubescent and sparsely granulate. Pronotum (PL 0.55 mm, PW 0.6 mm) broadest at base, gradually narrowing anteriad, lateral margin narrowly rimmed. Anterior corners acute, slightly produced, posterior corners rectangular. Disc smooth and shiny, punctures sparser than on lateral parts. Areas near anterior and posterior corners coarse, densely and finely granulate. Median groove moderately wide, extending from basal 0.2 – 0.6. Lateral carinae present in basal 0.4. Elytra (EL 1.25 mm, EW 0.8 mm) subparallel in basal 0.67, distal 0.33 distinctly attenuate. Strial punctures in basal 0.5 unequal in size and depth, separated by 1.0 – 1.5 × their diameters, being deepest in the third stria, becoming smaller and shallower on declivity (separated by 2 – 3 × their diameters); striae not reaching elytral apex. Elytral intervals weakly convex, smooth and shiny, with only a few small setal punctures; interval 4 very slightly more convex than intervals 1 – 3; intervals 5 – 7 carinate (due to fusion of elytral striae 5 and 6), carina on interval 5 extending from basal 0.1 to apex, carinae on intervals 6 and 7 complete, merging at basal ~ 0.1. Elytral apices narrowly conjointly rounded. Prosternal disc coarse, sparsely punctate and pubescent, lateral areas densely tomentose. Prosternal process gradually narrowed in basal 0.8, then distinctly narrowed in distal 0.2, apex narrowly rounded. Disc of prosternal process sparsely punctate and pubescent. Metaventrite shiny, with a few larger elongate punctures, slightly impressed medially; median sulcus present in basal 0.7, distinctly narrowed from base to apex. Lateral areas densely pubescent. Posterior margin of metaventrite impressed, with two large impressions behind of mesocoxae, and a row of middle-sized punctures in front of metacoxae. Disc of ventrite I flat, smooth, and shiny, with only a few punctures, and a transverse row of few granules posteriorly; anteriorly impressed and wrinkled; laterally bordered by strong admedian carinae. Middle of ventrites II – IV and basal 0.33 of ventrite V smooth and shiny, with only a few punctures. Distal 0.67 of ventrite V densely pubescent and granulate. Lateral areas of ventrites I – IV densely pubescent. Lateral margins of ventrite V fringed with short spines; apex subtruncate, lateral apical corners covered by a brush of stiff setae. Aedeagus. 0.8 mm long, elongated, and cylindrical. Penis ~ 2.2 × as long as phallobase. Penis gradually broadened in basal 0.25, then almost subparallel to apical 0.25, then distinctly narrowed toward cuspidal apex. Sclerotizations of endophallus in median part of penis (basal 0.3 – 0.7) resembling a “ bowknot ” (in ventral / dorsal view), consisting of a pair of ovoid structures, each with an apical curved tooth and a moderately long, thin basal rod. Parameres short, clinging to penis, reaching apical 0.45 of penis. Females. Disc of metaventrite more evenly convex or evenly flattened than in males, without larger punctures or granules; ventrite I less impressed anteriorly, without distinct wrinkles; ventrite V very similar to male, but more sparsely granulate; apex subtruncate or weakly rounded.	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
5B246B76E0325B2EA681F05C9119A4AC.taxon	description	Measurements. (type specimens) Males: BL 1.68 – 1.90 mm (n = 10), BW 0.75 – 0.80 mm (n = 7); females: BL 1.80 – 1.96 mm (n = 10), BW 0.75 – 0.80 mm (n = 3). Including the additional material, the BL of Z. disparilis is 1.46 – 2.00 mm. The smallest male (Anhui, CWBS 299) is 1.50 mm long, the smallest female (Anhui, CWBS 301) 1.46 mm, and the largest female (Hunan, CWBS 24) 2.00 mm.	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
5B246B76E0325B2EA681F05C9119A4AC.taxon	distribution	Distribution. Anhui, Gansu, Guizhou, Hunan, Shaanxi. Remarkably, there are no records from Hubei at present.	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
5B246B76E0325B2EA681F05C9119A4AC.taxon	etymology	Etymology. The name is derived from the Latin adjective disparilis (disparate, different, unequal), referring to the differently sized and variably deep impressed elytral punctures.	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
1015FD05253F54C68A74BD25083B13C0.taxon	description	Figs 3 C, D, 9 A – C, 12 D – F	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
1015FD05253F54C68A74BD25083B13C0.taxon	description	Description. Male (holotype). BL 1.7 mm, BW 0.7 mm. Dorsum dark brown, ventral side and legs reddish brown except tarsi. Antennae, mouth parts, and tarsi yellowish brown. Labrum wider than long, anterior margin not emarginate, basal 0.5 microreticulate, distal 0.5 smooth and shiny, sparsely punctate and pubescent laterally. Clypeus and frons densely punctate and pubescent. Pronotum (PL 0.5 mm, PW 0.6 mm) broadest at basal 0.3, slightly narrowed posteriorly and distinctly attenuate anteriorly, posterior corners rectangular. Disc smooth and shiny, densely pubescent shallowly punctate. Areas near anterior and posterior corners coarsely granulate. Median groove short and shallowly impressed, extending from basal 0.4 – 0.7. Lateral carinae present in basal 0.4, joined by a distinct mesial groove. Base of pronotum with a group of granules medially. Elytra (EL 1.2 mm, EW 0.75 mm) broadest at basal 0.67, slightly narrowed anteriorly and distinctly attenuate posteriorly, apices narrowly conjointly rounded. Strial punctures large in basal 0.5, separated by 0.5 – 1.0 × their diameters; punctures becoming smaller and well separated in distal 0.5. Intervals smooth and shiny, each with a row of setae; intervals 7 and 8 distinctly carinate, extending from base to declivity. Base of elytra narrowly granulate. Lateral margins distinctly denticulate. Prosternum coarsely punctate and pubescent. Prosternal process distinctly narrowed from base to narrowly rounded apex; lateral margin distinctly rimmed. Disc convex, coarse, sparsely punctate and pubescent. Metaventrite slightly and broadly impressed, disc smooth and shiny, sparsely punctate and pubescent; median groove extending from base to anterior 0.1, gradually narrowed towards apex; lateral area densely pubescent and sparsely granulate; each side with two large elongate pits behind mesocoxae and a row of large punctures is in front of metacoxae. Disc of ventrite I convex, largely smooth and shiny, sparsely punctate; along anterior margin slightly impressed with densely arranged, deeply impressed grooves; laterally bordered by strong admedian carinae. Discs of ventrites II – IV and basal 0.2 of ventrite V smooth and shiny; sparsely punctate and pubescent. Lateral sides of ventrites I – IV densely pubescent and sparsely granulate. Apex of ventrite V subtruncate, lateral apical corners rounded, bearing some stiff setae. Protibia distinctly enlarged. Aedeagus. 0.69 mm long, elongate. Penis ~ 3.5 × as long as phallobase, very slightly asymmetrical, subparallel in basal 0.4, then gradually narrowed; apex subacute. Sclerotizations of endophallus in basal 0.5 of penis, consisting of a pair of elongate ovoid structures (in basal 0.3 – 0.5) and a pair of long thin contiguous basal rods. Parameres short, reaching apical 0.33 of penis. Females. Protibiae not distinctly enlarged. Sexual dimorphism of metaventrite and abdominal ventrites poorly developed; ventrite I anteriorly less strongly impressed and less distinctly wrinkled; apex of ventrite V variable in both sexes: weakly emarginate, subtruncate or weakly rounded.	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
1015FD05253F54C68A74BD25083B13C0.taxon	description	Measurements. Males: BL 1.50 – 1.86 mm (n = 18), BW 0.75 – 0.80 mm (n = 6); females: BL 1.68 – 1.86 mm (n = 17), BW 0.75 – 0.80 mm (n = 3).	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
1015FD05253F54C68A74BD25083B13C0.taxon	distribution	Distribution. Gansu, Shaanxi, Sichuan, Yunnan,? Himalaya. Comparison with Himalayan specimens (Himachal Pradesh, Nepal, Bhutan) indicates that Zaitzevia hybrida seems to occur there as well. However, it will be necessary to confirm this assumption by molecular data.	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
1015FD05253F54C68A74BD25083B13C0.taxon	etymology	Etymology. The epithet is derived from the Latin noun hybrida (hybrid) referring to the fact that Zaitzevia hybrida and a number of other undescribed species from China and the Himalaya combine diagnostic characters of Zaitzevia and Zaitzeviaria.	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
0661EB0E5132553891AAFD57374E301B.taxon	description	Figs 2 A, B, 6 A – C, 11 A – C	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
0661EB0E5132553891AAFD57374E301B.taxon	description	Description. Male (holotype). BL 2.5 mm, BW 1.1 mm. Body slender. Dorsal surface black, ventral surface dark brown to black. Legs dark brown to black but tarsi reddish brown. Antennae yellowish brown. Labrum wider than long, microreticulate in basal 0.33 but smooth and shiny in distal 0.67; punctures and pubescence moderately dense. Anterior margin arched, not emarginate, densely pubescent laterally. Clypeus and frons densely pubescent and granulate. Clypeal suture shallowly impressed. Pronotum (PL 0.7 mm, PW 0.8 mm) subparallel in basal 0.4, distinctly attenuate anteriorly. Lateral margin narrowly rimmed, anterior 0.5 slightly serrate. Anterior corners acute, slightly produced; posterior corners almost right-angled. Disc smooth and shiny, densely punctate and covered by golden setae. Median sulcus extending from basal 0.2 – 0.6. Sublateral carinae present in basal 0.4. Areas near anterior and posterior corners densely and finely granulate. Elytra (EL 1.8 mm, EW 1.1 mm) broadest at anterior 0.67, slightly narrowed anteriorly and distinctly attenuate posteriorly, apices separately rounded. Strial punctures moderately large in basal 0.5, separated by 1 – 2 × their diameters, distinctly smaller and well separated in distal 0.5. Intervals flat, sparsely punctate, each with a row of moderately long setae. Carinae on intervals 5, 7 and 8 complete. Prosternum laterally densely pubescent; prosternal process gradually narrowed from base to basal 0.8, distinctly narrowed in distal 0.2, apex narrowly rounded; lateral margin distinctly rimmed; disc rugose, sparsely punctate and pubescent. Metaventrite broadly and shallowly impressed, disc smooth and shiny, sparsely punctate, and pubescent, somewhat rugose in posterior 0.5; median sulcus broad in posterior 0.8, and narrowed in anterior 0.2; with a row of large punctures behind of mesocoxae and a shallow groove in front of metacoxae; base with a pair of large pits on each side of median sulcus. Ventrite I with a pair of admedian carinae; disc distinctly impressed, microreticulate and sparsely punctate. Middle of ventrites II – IV and anterior 0.25 of ventrite V smooth and shiny, sparsely punctate and sparsely pubescent. Lateral areas of ventrites I – V densely pubescent. Distal 0.75 of ventrite V densely granulate and sparsely pubescent. Lateral margins of ventrite V fringed with short spines; apex of ventrite V widely and deeply emarginate medially; lateral corners forming long teeth. Aedeagus. 1.1 mm long, elongate, cylindrical. Penis ~ 2.5 × as long as phallobase, subparallel in basal 0.7, distinctly narrowed in distal 0.3, apex acute. Sclerotizations of endophallus somewhat resembling a pair of overlapping banana leaves; apex of endophallus with a pair of large curved double-pointed teeth. Parameres very slim, reaching apical 0.3 of penis. A specimen from Hunan (CWBS 20) with everted endophallus has been illustrated by Jäch and Boukal (1995: figs 36, 37); unfortunately, this particular specimen could not be traced and is therefore not designated as paratype. Females. Secondary sexual dimorphism rather poorly developed. Elytra apically often, but not always, more acuminate than in males. Metaventrite, including discrimen, a little less strongly or less comprehensively impressed. Disc of ventrite I less distinctly impressed. Ventrite V less widely and less deeply excised apically, lateral apical teeth distinctly shorter and smaller than in males; apical 0.33 of ventrite V less strongly granulate. Femora on average insignificantly slimmer than in males.	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
0661EB0E5132553891AAFD57374E301B.taxon	description	Measurements. Males: BL 2.5 – 2.8 mm, BW 1.1 – 1.2 mm (n = 10); females: BL 2.4 – 2.9 mm, BW 1.1 – 1.2 mm (n = 12).	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
0661EB0E5132553891AAFD57374E301B.taxon	distribution	Distribution. Hubei, Hunan, Shaanxi.	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
0661EB0E5132553891AAFD57374E301B.taxon	etymology	Etymology. The epithet is derived from the Latin adjective pilosus (hairy, pilose) and refers to the pronounced pilosity on the dorsal body surface often observed in fresh specimens.	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
74FFDBBBBD765F82ABB5B71AF1F41256.taxon	description	Figs 1 A – D, 5 A – C, 10 A – C	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
74FFDBBBBD765F82ABB5B71AF1F41256.taxon	description	Description. Male (holotype). BL 3.6 mm, BW 1.5 mm. Body elongate obovate. Antennae yellowish brown, dorsum black, ventral surface reddish brown to dark brown, and legs reddish brown. Labrum smooth and shiny, with only a few punctures and scarce pubescence, lateral margins densely covered with long setae; anterior margin broadly rounded, not emarginate. Clypeus and frons densely punctate and pubescent, sparsely granulate. Pronotum (PL 0.9 mm, PW 1.1 mm) broadest at basal 0.3, slightly narrowed posteriorly and distinctly attenuate anteriorly. Disc in basal 0.3 rugose, sparsely punctate and pubescent, in distal 0.7 smooth and shiny, densely punctate and sparsely pubescent. Lateral areas densely granulate and sparsely pubescent. Anterior corners acute, slightly produced, posterior corners almost right-angled. Lateral margin narrowly rimmed. Median sulcus extending from basal 0.2 – 0.8, broadest at basal 0.3, gradually narrowed anteriorly and posteriorly. Sublateral carinae present in basal 0.4 bending outwards at basal 0.3. Elytra (EL 2.7 mm, EW 1.5 mm) broadest at distal 0.33, slightly narrowed anteriorly and distinctly attenuate posteriorly. Lateral margin serrate. Strial punctures small in basal 0.5, separated by 0.5 their diameters, punctures in distal 0.5 smaller and well separated (1 – 3 × their diameters). Intervals rugose, sparsely punctate and pubescent. Intervals 2 – 4 slightly elevated in basal 0.2. Intervals 5, 7 and 8 carinate. Elytral apices separately rounded, densely granulate. Prosternum with disc rugose, almost glabrous; lateral parts of prosternum granulate and pubescent. Prosternal process gradually narrowed from base to broadly rounded apex; disc glabrous, surface coarse, with a few small setae and scattered granules; lateral margins distinctly rimmed. Metaventrite broadly impressed medially, disc smooth and shiny, with some longitudinal rugosities; median sulcus broad in posterior 0.8 and narrow in anterior 0.2; lateral areas densely pubescent and sparsely granulate; with a row of large punctures behind of mesocoxa and another row of small punctures in front of metacoxa; base with a pair of pits on each side of median sulcus. Ventrite I with a pair of admedian carinae; area between these carinae (disc) flat or slightly concave, anteriorly rugose, remaining parts with small punctures, interstices micropunctate. Lateral areas of ventrites I – V densely pubescent and sparsely granulate. Middle of ventrites II – IV and basal 0.5 of ventrite V glabrous and sparsely punctate. Distal 0.5 of ventrite V densely granulate; lateral margins sometimes fringed with very short, inconspicuous spines; apex deeply emarginate medially, lateral corners produced, tooth-like and slightly bent ventrad. Mesal margin of mesotibia slightly expanded around middle. Aedeagus. 1.9 mm long, elongate, penis ~ 2.2 × as long as phallobase. Lateral margins of penis in ventral / dorsal view more or less subparallel except for a very inconspicuous swelling and / or a very shallow emargination at apical 0.3; dorsal wide with a conspicuous gibbosity of variable size at apical 0.25 (best seen in lateral view); apex of penis broadly and evenly rounded in ventral / dorsal view, distinctly curved dorsad in lateral view. Endophallus in distal 0.33 with a pair of small curved teeth. Parameres short and inconspicuous, clinging to penis. Females. Elytral apices not separately rounded but distinctly acuminate and produced to a remarkably variable extent; they vary from short to long and beak-like, and sometimes they are asymmetrically produced, being longer on one side than on the other. Metaventrite flat or slightly depressed, distinctly less strongly impressed than in males, smoother. Disc of ventrite I more or less convex. Ventrite V less widely and less deeply excised apically, lateral apical teeth shorter and smaller than in males; apical 0.33 of ventrite V less strongly granulate. The femora often appear to be more strongly-built in the males, but this depends largely on the body size (in larger specimens the femora are proportionately thicker).	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
74FFDBBBBD765F82ABB5B71AF1F41256.taxon	description	Measurements. Males: BL 3.50 – 3.80 mm (n = 14), BW 1.40 – 1.55 mm (n = 5); females: BL 3.14 – 3.78 mm (n = 25), BW 1.40 – 1.60 mm (n = 11).	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
74FFDBBBBD765F82ABB5B71AF1F41256.taxon	distribution	Distribution. Hubei, Shaanxi, Sichuan.	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
74FFDBBBBD765F82ABB5B71AF1F41256.taxon	etymology	Etymology. The name robustus, a Latin adjective, refers to the massive body.	en	Bian, Dong-Ju, Jäch, Manfred A. (2025): The species of the genus Zaitzevia Champion, 1923 (Coleoptera, Elmidae) from Shaanxi Province, China. ZooKeys 1264: 129-157, DOI: 10.3897/zookeys.1264.156144
