taxonID	type	description	language	source
91967D97145758BDA1C8E93BF30F3971.taxon	description	Figs 1, 2, 3 Chinese name. 海南宽颈短跗甲.	en	Jiang, Ri-Xin, Chen, Xiang-Sheng, Yang, Lin (2025): First record of the jacobsoniid beetle genus Derolathrus Sharp (Coleoptera, Jacobsoniidae) from China with the description of a new species. Deutsche Entomologische Zeitschrift 72 (2): 217-223, DOI: 10.3897/dez.72.159951
91967D97145758BDA1C8E93BF30F3971.taxon	diagnosis	Diagnosis. Winged species; integument of head and pronotum with polygonal reticulation, the polygons more or less squared; surface of head and pronotum covered with sparse large punctures; disc of head with a shallow and flat longitudinal depression; eyes developed and large; pronotal disc with distinct longitudinal impression extending approximately half the pronotal length; each elytron with an entire sutural stria and one reduced second stria, which is connected at base at a shallow pit, the second elytral stria very short, less than 1 / 10 of the elytral length; metaventrite very long, about as long as combined length of ventrites I – V; aedeagus slender, symmetrical, with parameres distinctly medially curved and apically rounded.	en	Jiang, Ri-Xin, Chen, Xiang-Sheng, Yang, Lin (2025): First record of the jacobsoniid beetle genus Derolathrus Sharp (Coleoptera, Jacobsoniidae) from China with the description of a new species. Deutsche Entomologische Zeitschrift 72 (2): 217-223, DOI: 10.3897/dez.72.159951
91967D97145758BDA1C8E93BF30F3971.taxon	description	Description. Male. Body (Fig. 1 A) shape subcylindrical, narrowly elongate, reddish-brown, surface slightly shiny. Winged species. BL: 0.93 – 0.98 mm. Head (Fig. 2 A), nearly squared, wider than long, widest across eyes, HL: 0.15 – 0.16 mm, HW: 0.20 – 0.21 mm. Dorsal surface covered with micro-polygonal netting and sparse large punctures, each puncture bearing a short seta, the diameter of the puncture larger than that of ommatidia. Disc of head with a shallow and flat longitudinal depression, less than half the length of head, about twice as wide as the diameter of punctures on the head surface. Frons slightly concave between antennal tubercles. Antennae (Fig. 2 D) with 11 antennomeres; longer than length of pronotum, surface covered with sparse long setae; antennomere I partially hidden by the lateral margin of head; antennomere II expanded, longer than wide; antennomeres III – IX moniliform, short and transverse; antennomeres X – XI fused and forming a club, expanded; antennomere XI slightly longer and narrower than antennomere X, with apex rounded. Pronotum (Fig. 2 B), nearly trapezoid, about as long as wide and as wide as head, widest at anterior 1 / 4, PL: 0.20 – 0.22 mm, PW: 0.20 – 0.21 mm. Pronotal surface with micro-polygonal netting, the polygons more or less squared and covered with sparse large punctures, each puncture bearing a short seta. Disc of pronotum with a distinct longitudinal depression, about as long as 1 / 2 pronotal length; width of the longitudinal depression about as wide as twice the diameter of punctures on the pronotum surface. Anterior margin weakly curved, anterior angles rounded; lateral margins finely curved at anterior 3 / 4 and distinctly narrowed at posterior 1 / 4; posterior margin curved, posterior angles obtuse. Prosternal process (Fig. 2 C) with wide and round apex. Elytra. About twice as long as wide (Fig. 3 A), widest before mid-point, EL: 0.57 – 0.60 mm, EW: 0.25 – 0.27 mm. Elytral sutural stria I is distinct and long, extending from the elytral base, but not extending to the apex; stria II strongly reduced, less than 1 / 10 of the elytral length. Elytral surface covered with irregular micro-polygonal netting and rows of tiny and sparse punctures; punctures of elytra smaller than that of head and pronotum. Scutellum not visible. Metaventrite (Fig. 3 B), very long, about as long as of the combined length of abdominal ventrites 1 – 5, surface covered with sparse small punctures, lateral portions with longitudinal micro polygonal netting. Abdomen (Fig. 3 B) with five ventrites, ventrite 6 sometimes partially visible. Ventrite 1 about as long as ventrite 5, with lateral portions bearing polygonal netting and posterior margin nearly straight; ventrites 2 – 4 about the same in length, with surfaces bearing polygonal netting and sparse short setae, the posterior margin of ventrite II weakly curved and distinctly curved in ventrites 3 – 4. Ventrites 3 – 5, each with a row of round depressions at near anterior margins; posterior part of ventrite 5 with several long setae. Legs. Femora (Fig. 2 E – G) clavate, narrowed at the base, and gradually wider to apex; tibiae (Fig. 2 E – G) narrower than femora, constricted at basal portions, apex with a small tooth; surface of femora and tibiae with sparse short setae; all tarsi (Fig. 2 E – G) with three tarsomeres, the first and second tarsomeres short and minute, the third elongate, slightly curved in lateral view, much longer than combined length of two remaining tarsomeres. Aedeagus (Fig. 3 C) slender, symmetrical; parameres distinctly longer than median lobe, distinctly curved at middle, apex of parameres rounded. Female. Morphologically similar to male, without distinct sexual character in habitus. Measurements of female: BL: 0.93 – 0.97 mm; HL: 0.16 – 0.18 mm; HW: 0.19 – 0.20 mm; PL: 0.20 – 0.21 mm, PW: 0.21 – 0.22 mm; EL: 0.55 – 0.59 mm, EW: 0.26 – 0.28 mm.	en	Jiang, Ri-Xin, Chen, Xiang-Sheng, Yang, Lin (2025): First record of the jacobsoniid beetle genus Derolathrus Sharp (Coleoptera, Jacobsoniidae) from China with the description of a new species. Deutsche Entomologische Zeitschrift 72 (2): 217-223, DOI: 10.3897/dez.72.159951
91967D97145758BDA1C8E93BF30F3971.taxon	distribution	Distribution. Only known from the type locality: Jianfengling Area of National Park of Hainan Tropical Rainforest, Hainan Province, China.	en	Jiang, Ri-Xin, Chen, Xiang-Sheng, Yang, Lin (2025): First record of the jacobsoniid beetle genus Derolathrus Sharp (Coleoptera, Jacobsoniidae) from China with the description of a new species. Deutsche Entomologische Zeitschrift 72 (2): 217-223, DOI: 10.3897/dez.72.159951
91967D97145758BDA1C8E93BF30F3971.taxon	etymology	Etymology. The specific epithet refers to the type locality: Hainan Province, China; the name is treated as an adjective.	en	Jiang, Ri-Xin, Chen, Xiang-Sheng, Yang, Lin (2025): First record of the jacobsoniid beetle genus Derolathrus Sharp (Coleoptera, Jacobsoniidae) from China with the description of a new species. Deutsche Entomologische Zeitschrift 72 (2): 217-223, DOI: 10.3897/dez.72.159951
C805E1BDDC065526A3D1A067F3396608.taxon	type_taxon	Type species. Derolathrus atomus Sharp in Sharp & Scott (1908: 431).	en	Jiang, Ri-Xin, Chen, Xiang-Sheng, Yang, Lin (2025): First record of the jacobsoniid beetle genus Derolathrus Sharp (Coleoptera, Jacobsoniidae) from China with the description of a new species. Deutsche Entomologische Zeitschrift 72 (2): 217-223, DOI: 10.3897/dez.72.159951
