Cephennomicrus talomoensis, 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 : 470-471

Cephennomicrus talomoensis sp. n.

( Figs 5–6 , 15–18 , 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 / talomoensis m. / P. Jałoszyński, 2021 / HOLOTYPUS” [red, printed] ( MNHW).

Diagnosis. Body ( Fig. 5 ) large, BL ~ 1 mm, stout and strongly convex, with basic vestiture composed of extremely short, barely discernible and sparse setae, and with moderately numerous macrosetae ( Fig. 6 ) on pronotum and along outer margins of elytra; head with small but sharply marked and dense punctures, pronotum and elytra impunctate; antennal club dimerous; pronotum with two pairs of distinct antebasal pits, lacking transverse impression; aedeagus ( Figs 15–18 ) in ventral view pear-shaped, broadest near base; endophallus with indiscernible flagellum and with simple subapical median complex of sclerotized structures.

Description. Body of male ( Fig. 5 ) stout, strongly convex, uniformly dark brown; macrosetae slightly lighter than cuticle, basic vestiture of extremely short and sparse setae barely discernible; BL 1.03 mm.

Head broadest at large, moderately strongly convex and coarsely faceted eyes, HL 0.13 mm, HW 0.28 mm; vertex and frons evenly weakly convex; frontal glands not discernible. Punctures on frons and vertex small but sharply marked and dense, separated by spaces subequal to their diameters, setae barely discernible under magnification 100 ×. Antennae slender, with distinct and large dimerous clubs, AnL 0.43 mm; antennomeres 1–2 each elongate, 3–5 each about as long as broad, 6 indistinctly transverse, 7 about as long as broad, 8–10 each transverse (10 strongly so), 11 slightly elongate.

Pronotum subtrapezoidal, broadest slightly anterior to middle but weakly narrowing posteriorly; PL 0.35 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 twice as wide as between inner and outer pit. Punctures on pronotum extremely fine, inconspicuous; four pairs of macrosetae present ( Fig. 6 ): one posterolateral near each hind angle, one mediolateral near widest point, one anterolateral just behind eyes, and one anterodorsal in front of middle.

Elytra together oval, broadest distinctly in front of middle; EL 0.55 mm, EW 0.50 mm, EI 1.10; humeral calli distinct; subhumeral lines lacking; sides of elytra strongly rounded; elytral apices separately rounded. Punctures similar to those on pronotum, inconspicuous; numerous macrosetae ( Fig. 6 ) distributed only along outer lateral margin of each elytron.

Hind wings long and functional.

Legs moderately long and slender, unmodified.

Aedeagus ( Figs 15–18 ) elongate pear-shaped; AeL 0.20 mm; median lobe in ventral view broadest in basal region, apex with ventral wall broadly subtriangular and dorsal wall narrowly subtriangular with rounded distal margin; diaphragm oval and situated on sub-basal ventral region; flagellum indiscernible, endophallus with simple subapical median complex of sclerotized structures, parameres slender and in lateral view slightly recurved, each with two long apical and one short subapical setae.

Female. Unknown.

Distribution. Central Mindanao ( Fig. 19 ).

Etymology. Named after Mount Talomo.

Remarks. Cephennomicrus talomoensis has a unique pattern of macrosetae, differing from all remaining Philippine species. Its aedeagus is somewhat similar to that of Cm. leyteanus , Cm. palawanicus , and Cm. macrocephalus ( Fig. 19 ), but this is a superficial resemblance—shapes of the median lobe and inner endophallic structures are different.

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).