Cephennomicrus apoensis, Jałoszyński, 2024

Jałoszyński, Paweł, 2024, Cephenniini of the Philippines. Part 6. First record of Cephennomicrus Reitter from Mindanao, with three new species (Coleoptera, Staphylinidae, Scydmaeninae), Zootaxa 5471 (4), pp. 465-472 : 466-468

Cephennomicrus apoensis sp. n.

( Figs 1–2 , 7–10 , 19)

Type material. Holotype: PHILIPPINES ( Mindanao ): ♂, two labels: “PHILIPPINES: Mindanao / Davao Prov., Mt. Talomo (Mts. Apo) / Catigan, 800-1000 m / 7°01’21.0’’N, 125°22’30.5’’E / 29.4- 1.5.2019, A.V. Shavrin leg” [white, printed], “ CEPHENNOMICRUS / apoensis m. / P. Jałoszyński, 2021 / HOLOTYPUS” [red, printed] ( MNHW).

Diagnosis. Body ( Fig. 1 ) large, BL ~ 0.9 mm, stout and strongly convex, with basic vestiture composed of extremely short, barely discernible and sparse setae, and with few macrosetae ( Fig. 2 ) on pronotal base and sides of elytra; dorsum impunctate; antennal club dimerous; pronotum with two pairs of distinct antebasal pits, lacking transverse impression; aedeagus ( Figs 7–10 ) in ventral view bottle-shaped and subdivided into short basal capsule and long nearly tubular distal region, broadest near base; endophallus with long flagellum, lacking sclerites.

Description. Body of male ( Fig. 1 ) stout, strongly convex, uniformly dark brown; macrosetae slightly lighter than cuticle, basic vestiture of extremely short and sparse setae barely discernible; BL 0.95 mm.

Head broadest at large, moderately strongly convex and coarsely faceted eyes, HL 0.10 mm, HW 0.25 mm; vertex and frons evenly weakly convex; frontal glands not discernible. Punctures and setae on frons and vertex indiscernible under magnification 100 ×. Antennae slender, with sharply delimited large dimerous clubs, AnL 0.43 mm; antennomeres 1–2 each elongate, 3 about as long as broad, 4–9 each indistinctly elongate, 10 indistinctly transverse, 11 slightly elongate.

Pronotum subtrapezoidal, broadest between middle and anterior third and distinctly narrowing posteriorly; PL 0.39 mm, PW 0.45 mm; anterior margin strongly convex; lateral margins strongly rounded in anterior half, nearly straight in posterior half; posterior corners slightly obtuse-angled and blunt; posterior margin distinctly bisinuate and with small median emargination in front of scutellar shield. Pronotal base with two pairs of small but deep and nearly circular pits, inner pair not connected by groove, distance between inner pits about twice as wide as between inner and outer pit. Punctures on pronotum extremely fine, inconspicuous; two pairs of macrosetae present ( Fig. 2 ): one posterolateral near each hind angle, and one posteromedian in front of scutellar shield.

Elytra together oval, broadest distinctly in front of middle; EL 0.55 mm, EW 0.48 mm, EI 1.16; humeral calli distinct; subhumeral lines lacking; sides of elytra strongly rounded; elytral apices separately rounded. Punctures similar to those on pronotum, inconspicuous; three macrosetae ( Fig. 2 ) distributed along lateral margin of each elytron.

Hind wings long and functional.

Legs moderately long and slender, unmodified.

Aedeagus ( Figs 7–10 ) elongate bottle-shaped; AeL 0.25 mm; median lobe in ventral view broadest in basal region, subdivided into short and broad proximal capsule and abruptly delimited nearly tubular and elongate distal region, apex with elongate apical plate abruptly delimited from subapical region; diaphragm ventral, small and circular, situated in sub-basal region; endophallus with long flagellum, lacking sclerites; parameres slender and in lateral view recurved, each with two short apical setae.

Female. Unknown.

Distribution. Central Mindanao ( Fig. 19 ).

Etymology. Named after Mount Apo.

Remarks. Among species known to occur in the Philippines, Cm. apoensis has a similar distribution of macrosetae to those of Cm. lasios (which has one more posterior elytral pair) and Cm. lagunensis (which has one more anterolateral pronotal pair), but the two latter species have conspicuously different aedeagi ( Fig. 19 ), with much slenderer basal capsules.

Figures

FIGURE 19. Distribution of nominal Cephennomicrus species within the Philippines, with aedeagus illustrated for each species.

FIGURES 1–6. Cephennomicrus apoensis sp. n. (1–2), Cm. candalaganus sp. n. (3–4), and Cm. talonoensis sp. n. (5–6). Dorsal habitus of holotype males (1, 3, 5); distribution of macrosetae (2, 4, 6).

FIGURES 7–18. Aedeagus in ventral (7, 9, 11, 13, 15, 17) and lateral (8, 10, 12, 14, 16, 18) views. Cephennomicrus apoensis sp. n. (7–10), Cm. candalaganus sp. n. (11–14), and Cm. talonoensis sp. n. (15–18).