taxonID	type	description	language	source
4344351F000C5E0B8BA1AB45D8D697D3.taxon	description	Figs 1, 2	en	Yin, Zi-Wei, Niu, Xiao-Ling (2025): Triartiger caiyujiei sp. nov., a remarkable clavigerite beetle (Coleoptera, Staphylinidae, Pselaphinae) associated with Pseudolasius ants (Hymenoptera, Formicidae) from East China. Deutsche Entomologische Zeitschrift 72 (1): 9-14, DOI: 10.3897/dez.72.144365
4344351F000C5E0B8BA1AB45D8D697D3.taxon	diagnosis	Diagnosis. Male. Habitus moderately stout, with relatively long antennae and legs. Body length approximately 2.3 mm. Head and pronotal base with distinct microsculpture cuticle and covered by suberect setae; antenna with short antennomeres 1 and 2 and exceptionally long antennomere 3; 3 approximately 13 × as long as 2. Elytra finely punctate, lacking linear sculpture, posterior margins with large trichomes. Mesofemur with large blade-like ventral spine, mesotibia with large triangular spine at approximately middle of mesal margin; metafemur simple. Abdomen suboval; composite tergite deeply and broadly concave at base, with pair of broad basolateral trichomes, disc glabrous and with long, sparse setae; paratergites 1 (IV) with broadly curved longitudinal trichomes at bases; posterior margin of composite tergite and tergite 4 (VII) with row of long setae. Aedeagus dorso-ventrally symmetrical, divided into basal and apical parts; basal capsule with large ventral projection, apical lobe abruptly narrowed before apex. Female. Unknown.	en	Yin, Zi-Wei, Niu, Xiao-Ling (2025): Triartiger caiyujiei sp. nov., a remarkable clavigerite beetle (Coleoptera, Staphylinidae, Pselaphinae) associated with Pseudolasius ants (Hymenoptera, Formicidae) from East China. Deutsche Entomologische Zeitschrift 72 (1): 9-14, DOI: 10.3897/dez.72.144365
4344351F000C5E0B8BA1AB45D8D697D3.taxon	description	Description. Male. Body (Fig. 1 A) length 2.33 mm; colour reddish-brown, tarsi and mouthparts lighter in colour. Dorsal surface of head, pronotum and elytral disc covered with suberect setae, those of head and pronotum distinctly longer than elytral disc; setae of abdominal disc sparse and long, those along posterior margin much denser than disc. Head (Figs 1 B and C) dorsally subcylindrical, much longer than wide, length 0.46 mm, width across eyes 0.30 mm; vertex slightly convex, foveae (dorsal tentorial pits) (Fig. 1 B; vf) laterally located just above eyes; frons forming narrow rostrum, extending anteriorly to form vertical keel at middle; vertex and lateral portions of head with distinct microsculpture, frons smooth, finely punctate; clypeus markedly short, anterior margin with short, sparse setae. Venter with rough surface, gular region broadly and moderately impressed, tiny gular foveae (posterior tentorial pits) widely separated, lacking median carina. Compound eyes weakly prominent, each composed of approximately 10 ommatidia. Cervical part sub-globose, surface with distinct reticulate microsculpture. Antenna (Fig. 1 D) 0.72 mm long, lacking modifications; antennomere 1 thick and short, dorsally completely covered by rostrum, invisible, 2 slightly shorter than 1, transverse, dorsally partially visible, antennomere 3, 0.67 mm long, 0.15 mm wide, 13.4 × as long as 2, narrowing from base towards apex, broadest and truncate at apex. Pronotum (Fig. 1 C) approximately as long as wide, length 0.44 mm, width 0.43 mm, widest at approximately anterior 1 / 3, basal 1 / 3 with microsculpture similar to that of head; lateral margins rounded at widest point, narrowing anteriorly and slightly so posteriorly; disc slightly impressed mediobasally, lacking foveae. Prosternum with basisternal (precoxal) portion longer than procoxal rests, lacking procoxal foveae; hypomera completely fused with sternum, lacking hypomeral grooves and carinae. Elytra tightly joined, subtrapezoidal, much wider than long, length 0.49 mm, width 0.94 mm, lacking foveae, anterior margin greatly oblique; each elytron with one complete adsutural carina and one short discal carina originating from base; posterolateral margins roundly convex; posteromedial portions with patches of dense, long setae, posterolateral portions with large, triangular trichomes (Fig. 1 A). Metathoracic wings remnant. Mesoventrite short, fused with metaventrite, with median mesoventral foveae anterior to median keel, the latter angularly projecting at middle; pair of small lateral mesoventral foveae present. Metaventrite greatly convex at middle, descending laterally, lacking foveae, broad metaventral intercoxal process widely separating coxae and broadly and slightly convex at middle; area anterior to process with golden, densely setose patch. Legs long; mesofemur and mesotibia (Fig. 1 F) each with one large, blade-like and one much larger, subtriangular spine on ventral and middle of mesal margin, respectively; metafemur (Fig. 1 G) simple, lacking tubercles or spines. Abdomen slightly broader than elytra, suboval, widest at basolateral margins of composite tergite, length 0.92 mm, width 0.98 mm. Tergite 1 (composite tergite formed by tergites 1 – 3 (IV – VI )) deeply concave at base, with pair of large basolateral sockets, with large trichomes (Fig. 1 E) mesal and posterior to sockets, 2 (VII) short, transverse, with pair of small lateral nodules and foveae, 3 (VIII) transverse, roundly triangular, with pair of small basolateral foveae, posterior margin rounded. Paratergites 1 (IV) with greatly curved, longitudinal trichomes (Fig. 1 E) at bases. Sternites finely punctate, 2 (IV) as long as 3 (V) – 5 (VII) combined, with band of dense setae along base, with slightly prominent keel at middle, area lateral to keel weakly impressed, lacking foveae, 3 at middle as long as 4 (VI) and 5 combined, 2 – 4 each with distinct microsculpture on posterior half; 6 (VIII) transverse, posterior margin broadly emarginate at middle, 7 (IX) not observed. Aedeagus (Figs 1 H – J) 0.47 mm long, dorsoventrally symmetrical; median lobe divided into basal capsule and apical lobe, lacking parameres; basal capsule elongate, broadened and rounded at base, with large ventral projection and small, transverse foramen, dorsally with large oval diaphragm, apical lobe narrowing apically and abruptly narrowed before apex, in lateral view pointed apically, with two short, tiny apical setae; endophallus armature composed of short sclerite at middle of capsule. Female. Unknown.	en	Yin, Zi-Wei, Niu, Xiao-Ling (2025): Triartiger caiyujiei sp. nov., a remarkable clavigerite beetle (Coleoptera, Staphylinidae, Pselaphinae) associated with Pseudolasius ants (Hymenoptera, Formicidae) from East China. Deutsche Entomologische Zeitschrift 72 (1): 9-14, DOI: 10.3897/dez.72.144365
4344351F000C5E0B8BA1AB45D8D697D3.taxon	distribution	Distribution. East China: Zhejiang (Fig. 2 A).	en	Yin, Zi-Wei, Niu, Xiao-Ling (2025): Triartiger caiyujiei sp. nov., a remarkable clavigerite beetle (Coleoptera, Staphylinidae, Pselaphinae) associated with Pseudolasius ants (Hymenoptera, Formicidae) from East China. Deutsche Entomologische Zeitschrift 72 (1): 9-14, DOI: 10.3897/dez.72.144365
4344351F000C5E0B8BA1AB45D8D697D3.taxon	etymology	Etymology. The species epithet is dedicated to Yu-Jie Cai (蔡余杰), who collected the single adult and provided it for study. The name is a noun in the genitive case.	en	Yin, Zi-Wei, Niu, Xiao-Ling (2025): Triartiger caiyujiei sp. nov., a remarkable clavigerite beetle (Coleoptera, Staphylinidae, Pselaphinae) associated with Pseudolasius ants (Hymenoptera, Formicidae) from East China. Deutsche Entomologische Zeitschrift 72 (1): 9-14, DOI: 10.3897/dez.72.144365
825E2BC1B762500C9E407B9A76CE1234.taxon	type_taxon	Type species. Triartiger urceus Kubota, 1944: 11, by original designation.	en	Yin, Zi-Wei, Niu, Xiao-Ling (2025): Triartiger caiyujiei sp. nov., a remarkable clavigerite beetle (Coleoptera, Staphylinidae, Pselaphinae) associated with Pseudolasius ants (Hymenoptera, Formicidae) from East China. Deutsche Entomologische Zeitschrift 72 (1): 9-14, DOI: 10.3897/dez.72.144365
