Diochus uvellipticus Huang, Janak & Zhou 2025, sp. nov.
Creators: name: Huang, Tian
name: Janák, Jiří
name: Zhou, Hong-Zhang
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Staphylinidae
Diochus
Diochus uvellipticus

description: 8. Diochus uvellipticus Huang, Janák & Zhou, sp. nov.
(Figs 1F; 9-1; 9-2)
Type locality. Indonesia: Java.
Type material. Holotype: male, INDONESIA: Java: Col du Puncak et Cibodas, lac Telaga Warna, 1. VIII. 84, J. Robert (MHNG). Paratypes: INDONESIA: Java: 1 male, same data as holotype (MHNG).
Measurements. BL = 5.18 mm, FL = 2.24 mm, HL = 0.62 mm, HW = 0.47 mm, EyL = 0.17 mm, TL = 0.32 mm, ANL = 1.23 mm, ANT1 = 0.19 mm, ANT2 = 0.11 mm, ANT3 = 0.12 mm, ANT4 = 0.08 mm, ANT 11 = 0.15 mm, PL = 0.77 mm, PW = 0.63 mm, EL = 0.81 mm, EW = 0.91 mm, SL = 0.65 mm.
Description. Body long, narrowed anteriorly and posteriorly, large-sized. Body dark brown, abdominal intersegmental membrane lighter. Legs brown, tarsi distinctly lighter. Antennae brown to dark brown, apex of each antennomere lighter. Maxillary and labial palpi yellowish brown.
Head (Fig 9-1A). Rounded rectangle in shape, 1.31 times as long as wide. Tempora slightly widened backwards, posterior angles rounded. Dorsal surface shiny, bearing distinct and transverse microstriae, also with coarse and sparse punctures. Head with 5−7 irregular punctures scattered around each eye and numerous smaller punctures on deflexed portion of temple and near posterior margin. Each side of head with characteristic punctures: one frontal puncture on frontal region, two anterolateral punctures near antennal insertion, three lateral punctures near dorsal margin of eye, with temporal puncture and occipital puncture near basal margin; disc surface bearing two additional paired punctures in middle area. Frontal furrows and anteocular furrows absent. Eye medium-sized, distinctly protruding laterad, longitudinal diameter slightly longer than half the length of tempora (eye: tempora = 0.52). Epistoma not flattened, abruptly oblique, anterior margin slightly emarginate medially. Distance between antennal insertions (0.15 mm) distinctly longer than distance from antenna to eye (0.07 mm). Ventral surface with sparsely scattered punctures, interspaces between them as large as about 4 puncture diameters. Gular sutures deep, approaching each other before basal 1/4, but not confluent, then parallel to base.
Antennae (Fig 9-1B). Scape rod-shaped, slightly thickened apically, distinctly shorter than two subsequent antennomeres combined; antennomere 2 elongate; antennomere 3 slightly longer than 2; length of antennomere 4 about 1.3 times of width, antennomere 4 to 10 gradually shortened, antennomere 4 observably longer than 10; antennomere 11 distinctly longer than 10.
Mouthparts (Fig 9-1A). Labrum transverse, lateral margins rounded, widest at basal 1/2; anterior margin about half of width at the widest point. Mandibles (Fig 9-1D) falciform, left one with three small teeth on inner margin, whereas right one with two.
Neck (Fig 9-1A). Cylindrical, shiny, only bearing shallow microsculpture, width 0.15 mm, slightly shorter than 1/3 of head width. Dorsal surface with distinct groove; ventral surface with gular sutures forming obvious triangular region, with deep transverse median furrow.
Prothorax (Fig 9-1A). Pronotum elongate (PL to PW ratio 1.22), distinctly longer and wider than head.Anterior region near anterior angles deflexed, lateral margins widened posteriad to basal 1/4 (widest at 1/4), then convergent backwards, anterior and posterior angles broadly rounded. Dorsal surface glossy, extensively with micropunctures, but without any microsculpture. Each side of longitudinal midline with one row of punctures composed of 3 large punctures and 2 additional punctures outside of puncture row, 13–15 punctures scattered near each margin (including anterior, lateral and posterior margins). Prosternum bearing an observable transverse ridge between basisternum and furcasternum, angularly backwards.
Pterothorax (Fig 9-1A). Mesoscutellum triangular, surface shiny, bearing distinct microstriae, but without any punctures. Transverse ridge on mesoventrite wave shaped; paired oblique furrows short but deep; carina limiting mesocoxal cavity slightly arcuate. Discrimen region on metaventrite normally elevated.
Elytra (Fig 9-1A). Elytra distinctly transverse (EL to EW ratio 0.89), longer and wider than pronotum. Humeri well developed, lateral margins divergent posteriorly, posterior margin not rounded, but obliquely truncate. Dorsal surface shiny, flattened, without microsculpture; each elytron with row of 5 punctures along suture, row of 5 punctures on disc, also with 4−5 rows of punctures on deflexed portion.
Legs (Fig 9-1C). First four segments of protarsi heart-shaped, dilated, and those of meso- and metatarsi slender. Last segment of protarsi about the length of 2−4 together, that of meso-, meta- slightly shorter than the length of each 2−3.
Abdomen. Broadest at segment V. Tergites III–VII covered with dense and obvious transverse microstriae; each tergite with dense brown pubescence, also with row of darker and coarser setae at posterior margin of III–VI. Tergites III–VII with a basal impression near anterior margin, respectively, each one only possessing one basal transverse carina; all abdominal tergites with surface shiny, bearing polygonal microsculpture, with dense punctures. Posterior margin of tergite VII with distinct palisade fringe. All abdominal sternites shiny, with microstriae and punctures as those on tergites.
Male (Figs 9-1E–J; 9-2A–E). Head with a round elevation between eyes. Posterior margin of sternite VIII emarginate medially, basal transverse carina emarginate deeply (Figs 9-1E; 9-2B). Posterior margin of tergite VIII arcuate (Figs 9-1F; 9-2C). Tergite IX (Figs 9-1H; 9-2D) symmetrical, connected mediobasally, narrowed apically. Sternite IX (Figs 9-1G; 9-2E) symmetrical, widest near basal 1/2; basal margin deeply emarginate, apical margin slightly emarginate; width of apical margin slightly shorter than basal margin. Tergite X (Figs 9-1H; 9- 2D) symmetrical, triangular. Aedeagus (Figs 9-1I−J; 9-2A) symmetrical, large-sized, ca. 0.80 mm long, normally sclerotized. Parameres symmetrical, reaching above top of median lobe. Internal structures sclerotized: a triangle sclerite on top; paired irregular sclerites in middle. Sperm pump coiled, thinned toward apex.
Female. Unknown.
Distribution. Indonesia (Java).
Diagnosis. This species is related to the Oriental species D. bisegmentatus Zhou & Zhou, 2016 based on the similar aedeagal structure. This new species is distinctly larger in size, with more elongated pronotum and the first four segments of protarsi are not so strongly dilated. Regarding the short antennae, this new species is also similar to D. antennatus, D. acehensis sp. nov. and D. pulchellus. This new species can be separated from those by the longer pronotum and the deep emargination at the middle of posterior margin of male sternite VIII.
Etymology. The species epithet is derived from Greek terms, uv - and ellipt-, to indicate the elongate pronotum.
description: Published as part of Huang, Tian, Janák, Jiří & Zhou, Hong-Zhang, 2025, Revision of the genus Diochus Erichson (Coleoptera: Staphylinidae, Staphylininae, Diochini) from Indonesia, Malaysia and Singapore, pp. 441-479 in Zootaxa 5632 (3) on pages 467-470, DOI: 10.11646/zootaxa.5632.3.2, http://zenodo.org/record/15372327