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

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

( Figs 134–138 View FIGURES 134–141 )

Type material. Holotype: CHINA (YUNNAN Prov.): ♂, two labels: “CHINA: Yunnan / Nujiang Lisu Aut. Pref., / Salween side valley 5km S / Fugong, road SS 228, / km 223 (creek bank, litter sifted) / 8.VI.2007 D.W. Wrase [25]” [white, printed]; “ CEPHENNODES (s. str.) / planus m. / P. Jałoszyński, 2025 / HOLOTYPUS ” [red, printed] ( NKME) . Paratype: ♂, “CHINA: Yunnan ( CH07-25 ) / Nujiang Lisu Aut. Pref., / Salween side valley 5km S / Fugong, road SS 228, / km 223, under stones, moist / enbarkment {sic!} / 8.VI.2007 / leg. A. Pütz ” [white, printed], and yellow PARATYPUS label (cAP).

Diagnosis. Body extremely small, BL around 1 mm and conspicuously flattened; antennae gradually thickened; punctures on head, pronotum and elytra fine and inconspicuous; subhumeral lines only as long as 0.2 × EL. Male: lacking secondary sexual characters; aedeagus ( Figs 135–138 View FIGURES 134–141 ) in ventral view with oval capsular region of median lobe, lacking defined apex, apical projections elongate; each paramere with 3 setae.

Description. Body of male ( Fig. 134 View FIGURES 134–141 ) weakly convex, oval, lacking constriction between pronotum and elytra, moderately light brown, covered with yellowish setae. BL 1.03–1.05 mm.

Head broadest across moderately large and moderately strongly convex, coarsely faceted eyes, HL 0.13 mm, HW 0.25 mm; frontovertexal region weakly convex at middle; supraantennal tubercles weakly elevated. Punctures on clypeus and frontovertexal region fine and inconspicuous; setae short, sparse, suberect. Antennae moderately long and slender, gradually and strongly thickened, AnL 0.50 mm, antennomere 1 about as long as broad, 2 distinctly elongate, 3–6 each about as long as broad, 7 slightly elongate, 8–10 each weakly transverse, 11 almost as long as 9 and 10 combined, about 1.7 × as long as broad.

Pronotum semi-oval, moderately strongly convex at middle and flattened near hind corners, broadest near middle but barely discernibly narrowing posterad; PL 0.30–0.33 mm, PW 0.45–0.48 mm. Anterior margin in strictly dorsal view nearly straight; lateral margins strongly rounded in anterior half and only slightly rounded 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 much closer to posterior than lateral pronotal margin. Punctures on pronotal disc fine and inconspicuous; setae short and moderately dense, suberect.

Elytra about as wide as pronotum, together oval, broadest near anterior fourth; EL 0.60 mm, EW 0.45 mm, EI 1.33; subhumeral lines very short, as long as about 0.2 × EL but sharply marked, weakly divergent posterad; basal elytral fovea on each elytron situated in middle between lateral margin of mesoscutellum and subhumeral line; elytral apices separately rounded. Punctures on elytra fine and inconspicuous; setae similar to those on pronotum.

Hind wings functional.

Metaventrite with indistinct lateral impressions about as long as 1/3 of its length.

Legs long and slender, unmodified.

Aedeagus ( Figs 135–138 View FIGURES 134–141 ) of simonis form, AeL 0.15 mm; capsular region of median lobe in ventral view oval without defined apex; dorsal apical projection (= distal plate) in ventral view elongate and tapering distad, in lateral view curved dorsad at nearly right angle; parameres long and slender, not reaching apex of aedeagus, each with one long apical and two long subapical setae.

Female. Unknown.

Distribution. S China: Yunnan.

Etymology. The Latin adjective planus means flat; the body of C. planus is much less convex than in most congeners.

Remarks. Two examined specimens are externally identical and they have been collected on the same spot and on the same day. They slightly differ in some details of the aedeagus (holotype: Figs 135–136 View FIGURES 134–141 vs. paratype: 137–138). In lateral views, the aedeagi are almost identical and the observed differences in ventral view may be results of small differences in orientation in mounting medium.

Among Chinese species, C. planus has the aedeagus most similar to that of the previously known C. gaozhaianus and C. gracilis described below. Cephennodes gaozhaianus has a distinctly, densely punctate pronotum (in C. planus punctures are inconspicuous), and C. gracilis is more convex, the elytra are widest more posteriorly, the subhumeral lines are longer, over 0.3 × EL, the apical projections of aedeagus are of a different shape both in ventral and lateral views, and each paramere has an unusual number of four setae (three in C. planus ).