Cephennodes (s. str.) triangularis, Jałoszyński, 2025

Cephennodes (s. str.) triangularis sp. nov.

( Figs 95–103 View FIGURES 95–103 )

Type material. Holotype: CHINA (YUNNAN Prov.): ♂, two labels: “CHINA [1] - Yunnan, / Wuding, Lion Mountain / 2200 m, 25º31’59’’N, / 102º22’36’’E,sifted / 17.VIII.2014, V.Assing”[white, printed]; “ CEPHENNODES (s. str.) / triangularis m. / P. Jałoszyński, 2025 / HOLOTYPUS ” [red, printed] ( MNHW) GoogleMaps . Paratypes (21 exx.): 3 ♀♀, same data as for holotype GoogleMaps ; 2 ♂♂, 4 ♀♀, “CHINA [20] - Yunnan , / mt. W Gejiu, mixed / forest, 23º24’13’’N, / 103º07’28’’E, 1990 m, / 23.VIII.2014, V. Assing” [white, printed] GoogleMaps ; 5 ♂♂, 2 ♀♀, “CHINA: Yunnan , mountain W / Gejiu, 23º24’13’’N, 103º07’28’’E, / 1990 m, mixed forest, litter and / various debris sifted, 23.VIII.2014, / leg. M. Schülke [ CH14-20 ]” [white, printed] GoogleMaps ; 1 ♂, 2 ♀♀, “CHINA: Yunnan , mountain W / Gejiu, 23º24’13’’N, 103º07’28’’E, / 1990 m, mixed forest, litter and / various debris sifted, 24.VIII.2014, / leg. M. Schülke [ CH14-20 a]” [white, printed] GoogleMaps ; 2 ♀♀, “CHINA: Yunnan , mountain W / Gejiu, 23º24’13’’N, 103º07’28’’E, / 1990 m, mixed forest, litter and / various debris sifted, 25.VIII.2014, / leg. M. Schülke [ CH14-20 b]” [white, printed]. Each paratype with yellow “ PARATYPUS ” label ( MNB, MNHW, cPJ) GoogleMaps .

Diagnosis. Body large, BL around 1.5–1.6 mm; antennae with pentamerous clubs; punctures on frontovertexal region smaller than those on pronotum and elytra, punctures on pronotum small but sharply marked and dense, those on elytra slightly shallower, larger and sparser than those on pronotum; pronotal lateral carinae single; subhumeral lines short, as long as 0.3 × EL. Male: head modified ( Figs 96–98 View FIGURES 95–103 ), with pair of slightly transverse oval lateral asetose and impunctate impressions between antennal insertions and broad, dense, erect median tuft of setae between eyes appearing as curved ‘horn’ ( Fig. 98 View FIGURES 95–103 ); antennae modified, with antennomere 7 strongly enlarged and mesally projecting into subtriangular convexity; aedeagus ( Figs 100–103 View FIGURES 95–103 ) in ventral view with distal margin of capsular region subtriangular. Female: antennomere 7 enlarged, distinctly longer than 8 and subequal in width.

Description. Body of male ( Fig. 95 View FIGURES 95–103 ) strongly convex, oval, with very shallow constriction between pronotum and elytra, dark brown with slightly lighter tarsi, covered with light brown setae. BL 1.48–1.66 mm.

Head ( Figs 96–98 View FIGURES 95–103 ) broadest across moderately large and moderately strongly convex, coarsely faceted eyes, HL 0.24–0.25 mm, HW 0.38–0.43 mm; frontovertexal region with pair of slightly transverse oval lateral asetose and impunctate impressions between antennal insertions and broad, dense median erect tuft of setae between eyes appearing as curved ‘horn’ ( Fig. 98 View FIGURES 95–103 ). Punctures on clypeus large and dense, those behind impressions slightly smaller and sparser; setae on punctate areas moderately long, sparse, suberect. Antennae ( Fig. 99 View FIGURES 95–103 ) long and slender, with pentamerous clubs, AnL 0.88–0.93 mm, antennomere 1 about as long as broad, 2 weakly elongate, 3–6 each about as long as broad, 7 strongly enlarged, asymmetrical, with large mesal subtriangular convexity, 8–10 each indistinctly elongate, 11 as long as 9 and 10 combined, slightly more than twice as long as broad.

Pronotum semi-oval, moderately strongly convex at middle and flattened near hind corners, broadest slightly posterior to middle and weakly but distinctly narrowing posterad; PL 0.43–0.53 mm, PW 0.70–0.78 mm. Anterior margin in strictly dorsal view nearly straight; lateral margins strongly rounded in anterior half and weakly so posteriorly, finely microserrate, posterior corners nearly right-angled; posterior margin shallowly bisinuate; lateral marginal carinae simple (i.e., not doubled); lateral antebasal pits shallow but distinct, each located much closer to posterior than to lateral pronotal margin. Punctures on median region of pronotal disc small but sharply marked and deep, separated by spaces subequal to their diameters; punctures near anterior angles denser and coarse. Setae on pronotal disc long and moderately dense, suberect.

Elytra about as wide as pronotum, together oval, broadest near anterior third; EL 0.78–0.93 mm, EW 0.70–0.78 mm, EI 1.06–1.23; subhumeral lines developed as sharp borders between elevated humerus and lower mesal region, as long as about 0.3 × EL and distinctly divergent posterad; basal elytral fovea on each elytron almost equidistant from lateral margin of mesoscutellum and subhumeral line; elytral apices separately rounded. Punctures on elytra distinctly shallower and slightly sparser than those on pronotum but distinct; setae distinctly longer than those on pronotum, dense and erect.

Hind wings lacking.

Metaventrite lacking lateral impressions.

Legs long and slender, unmodified.

Aedeagus ( Figs 100–103 View FIGURES 95–103 ) of modified simonis form, AeL 0.43 mm; capsular region of median lobe in ventral view approximately drop-shaped, with distal margin subtriangular; dorsal apical projection (= distal plate) in ventral view slender, elongate and tapering distad, in lateral view hook-shaped, curved dorsad at nearly right angle; parameres long and slender, not reaching apex of aedeagus, each with one long apical and two similarly long subapical setae.

Female. Externally similar to male, except for unmodified head and antennae, and antennae slightly shorter in relation to BL; wingless; BL 1.54–1.63 mm; HL 0.21–0.25 mm, HW 0.35–0.43 mm, AnL 0.70–0.83 mm; PL 0.48–0.53 mm, PW 0.68–0.78 mm; EL 0.83–0.90 mm, EW 0.70–0.78 mm, EI 1.07–1.20.

Distribution. S China: Yunnan.

Etymology. The adjective triangularis refers to the triangular antennomere 7 in males.

Remarks. Cephennodes triangularis is the only species of the genus with the antennomere 7 bearing a large mesal subtriangular convexity. A small variability in the median lobe of aedeagus was found in this species ( Figs 100–103 View FIGURES 95–103 ); all males have the capsular region distally subtriangular, but the shape of the apex slightly varies.