Cephennomicrus pseudojaponigenus, Jałoszyński, Paweł, 2009

Jałoszyński, Paweł, 2009, Cephennomicrus Reitter (Coleoptera, Staphylinidae, Scydmaeninae) of Japan and Taiwan: taxonomic notes, ten new species and comparative morphology of nomurai and taiwanensis species groups, Zootaxa 2145, pp. 1-35 : 17-18

Cephennomicrus pseudojaponigenus sp. n.

( Figs. 34 , 39, 40 )

Type material. Holotype: JAPAN: 3, "FIT: Mt. Omotodake, A1, Ishigakijima Is., 100 m, Yaeyama, Okinawa Pref. [Ryukyus], 15–21. III. 2004, S. Nomura" (white, printed) ( NSMT). Paratype: JAPAN: 3, same data as for holotype ( PCPJ).

Diagnosis. Body length ca. 1 mm; pronotal disc with large, deep and sharply marked punctures distributed very unevenly; ante-basal pits on pronotum very small and located very close to posterior margin; aedeagus in dorsal view with median tubular structure surrounded at each side by dense group of thin, pointed sclerites.

Description. BL 1.03–1.05 (1.04). Body of male ( Fig. 34 ) strongly convex, moderately dark brown with yellowish vestiture.

Head large, HL 0.15, HW 0.25; vertex and frons convex, rounded together; frontal glands present, each as small as single ommatidium and located near anterior internal margin of eye; eyes very large, coarsely faceted, strongly convex. Punctation of frons and vertex very fine, moderately sparse; setae short, sparse and nearly recumbent. Antennae long, AnL 0.47–0.50 (0.48), moderately compact, with very large antennomeres X–XI and narrow antennomere IX, so that club appears to be only 2–segmented; antennomere I 1.6x as long as broad; II distinctly narrower than I but similar in length, 1.8x as long as broad; III much narrower than II, 1.2x as long as broad; IV–VI equal in length and width, each as narrow as II but slightly longer, 1.3–1.4x as long as broad; VII as narrow as VI but slightly longer, 1.5x as long as broad; VIII slightly shorter than VII but similar in width, 1.1–1.2x as long as broad; IX slightly broader and longer than VIII, 1.2x as long as broad; X much broader and longer than IX, about as long as broad; XI minimally broader and distinctly longer than X, 1.2x as long as broad.

Pronotum subrectangular, broadest in anterior third, PL 0.30, PW 0.37–0.39 (0.38); anterior margin broadly rounded; sides strongly rounded in anterior third, in posterior 2/3 nearly straight, very finely serrate, slightly convergent toward blunt and right hind angles; posterior margin with two long lateral and one short median emarginations; base of pronotum with four small but distinct pits forming two lateral pairs, internal pits are distinctly smaller than external ones, all pits are separated from posterior margin of pronotum by spaces as short as pit diameter. Punctures on pronotal disc are very distinct, as large as nearly half diameter of internal ante-basal pits, distributed densely but very unevenly, distances between punctures on central part of disc are 0.5– 4 x as long as puncture diameters; basic vestiture moderately long, sparse, nearly recumbent, additionally pronotum bears three pairs of very long, curved setae, located on lateral margins near anterior third, in hind angles, and opposite anterior corners of mesoscutellum in middle of posterior margin.

Elytra oval and elongate, broadest anterior to middle, EL 0.58–0.60 (0.59), EW 0.46–0.47 (0.46), EI 1.26–1.28; basal pits indistinct; humeral calli well marked, each separated from internal part of elytron by moderately deep basal impression running posteriorly and toward lateral margin of elytron; apices of elytra rounded together. Punctation very fine, composed of very small, sharply marked punctures distributed evenly and very densely; basic vestiture similar to that on pronotum, additionally lateral margin of each elytron is provided with two very long, curved and strongly erect setae, each slightly posterior to humerus and slightly posterior to middle. Hind wings well developed.

Legs slender and long, pro- and metatibiae straight, mesotibiae feebly recurved.

Metaventrite with very small median tubercle located slightly posterior to middle.

Aedeagus ( Figs. 39, 40 ) small, AeL 0.16, in ventral view drop-shaped with broad base and broad, nearly blunt apex; in lateral view short apical part is rapidly narrowing toward thin, pointed apex; internal armature simple, composed of median tubular structure surrounded at each side by dense group of thin sclerites with pointed apices; parameres in dorsal view with broadened apices, not reaching apex of median lobe, each bearing two long and one short apical setae (median seta is broken off in the illustrated specimen).

Female unknown.

Distribution. Japan, Okinawa Pref.: Ishigaki-jima Is.

Etymology. The name is derived from C. japonigenus , a species with extremely similar aedeagus.

Remarks. Cephennomicrus japonigenus , which has the most similar aedeagus to that found in C. pseudojaponigenus , is distinctly larger (1.17 mm vs. 1.03–1.05 mm in C. pseudojaponigenus ) and much stouter, and its frontal glands are more conspicuous. Moreover, in the new species lateral margins of the pronotum in posterior half are straight or nearly straight, whereas sides of the pronotum in C. japonigenus are slightly concave. The specimen fixed as the holotype lacks the right elytron; it was selected due to better preservation of the very thin-walled and fragile aedeagus, which in all species of the genus is the primary diagnostic character.

Figures

FIGURES 33 – 38. Dorsal view of Cephennomicrus (holotypes (33, 35 – 38) and paratype (34), males). 33, C. japonigenus (Jałoszyński & Hoshina). 34, C. pseudojaponigenus Jałoszyński. 35, C. pseudofujianus Jałoszyński. 36, C. okinawanus (Jałoszyński, S. Arai & K. Arai). 37, C. cactiformis (Jałoszyński & Hoshina). 38, C. taitungensis Jałoszyński. Scale bars: 0.2 mm.

FIGURES 39 – 44. Aedeagus of Cephennomicrus in ventral (39, 41, 43) and lateral (40, 42, 44) views. 39, 40, C. pseudojaponigenus Jałoszyński. 41, 42, C. pseudofujianus Jałoszyński. 43, 44, C. taitungensis Jałoszyński. Scale bars: 0.1 mm.