Cephennomicrus delicatissimus, 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 : 14-15

Cephennomicrus delicatissimus sp. n.

( Figs. 19 , 29, 30, 46, 49, 50, 51, 61–64, 65, 67, 70, 71, 74, 75, 79–81, 83, 85)

Type material. Holotype: TAIWAN: 3, " Taiwan, Chihpen Spa, Peinan Hsiang, Taitung Hsien, 1–5 IV 2004, F.I.T., Tomoyuki TSURU leg." (white, printed) ( NSMT). Paratypes (933, 3ƤƤ): TAIWAN: 3, same data as the holotype; 633, 2ƤƤ, " Taiwan, Nantou Hsien, Dehuashe, Tuch Hsiang, 8–11 IV 2004, F.I.T, Tomoyuki TSURU leg." (white, printed); 3, Ƥ, " Taiwan, yellow pan, Nantou, Jiyuehtan, 8–11 IV 2004, Tashiharu MITA leg." (white, printed) ( PCPJ).

Diagnosis. Body ca. 1 mm in length; frons, vertex and pronotal disc with very fine punctures; sides of pronotum nearly straight or feebly rounded, not constricted; lateral margin of each elytron with 3 long setae; aedeagus with long and broad central complex, median duct with two twists, basal loop present, median loop open.

Description. BL 0.97–1.01 (0.99); Body of male ( Figs. 19 , 46 ) slender, pigmentation light brown, vestiture slightly lighter than body.

Head ( Figs. 49 , 50 , 65 ) large, HL 0.14–0.15 (0.15), HW 0.25–0.26 (0.25); vertex and frons convex, rounded together; frontal glands ( Figs. 50, 51 ) about as small as single ommatidium, each located near internal anterior margin of eye; eyes large, coarsely faceted, moderately convex. Punctation on frons and vertex composed of very small, relatively dense, sharply marked punctures, distances between punctures on median part of vertex are as long as 1– 2 x puncture diameter; setae extremely short, sparse, nearly recumbent. Antennae as in Fig. 46 , AnL 0.45–0.47 (0.46).

Pronotum subrectangular in shape, broadest near anterior third; PL 0.29, PW 0.36–0.39 (0.37); anterior margin very weakly rounded; sides moderately strongly rounded in anterior third, distinctly but finely serrate, from broadest place to near base straight or very slightly convex, not constricted, slightly convergent toward blunt, obtuse hind angles; posterior margin with broad and shallow lateral and short median emarginations; base of pronotum with four relatively small but deep pits forming two lateral pairs. Punctation of pronotal disc composed of very small and relatively dense punctures barely discernible under magnification 40x. Basic vestiture very short, moderately sparse, nearly recumbent; additionally pronotum bears three pairs of very long and strongly erect setae located on lateral margins near broadest place, near hind angles, and in median part of posterior margin.

Elytra broadest near anterior third, EL 0.54–0.57 (0.55), EW 0.44–0.46 (0.45), EI 1.23–1.24. Each humeral callus is delimited from internal part of elytron by shallow and relatively broad basal impression running posteriorly and toward lateral margin of elytron; apices of elytra separately rounded. Punctation similar to that on pronotum but slightly sparser; vestiture slightly sparser than that on pronotum and composed of slightly shorter, nearly recumbent setae; additionally lateral margin of each elytron is provided with three long, strongly erect setae located near humerus, in broadest place and slightly posterior to middle. Hind wings well developed.

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

Metaventrite with extremely small median tubercle.

Aedeagus (Figs. 29, 30) relatively small, AeL 0.26; internal armature complicated, with long and broad central complex surrounding narrow median duct with two twists well visible in ventral view; basal loop present, median loop open; parameres with minimally broadened apices not reaching apex of median lobe, each paramere bears two short apical setae.

Female. Externally nearly identical to male but with slightly more slender elytra, and without median tubercle on metaventrite; BL 0.97–1.0 (0.98), HL 0.15, HW 0.25, AnL 0.44–0.45 (0.45), PL 0.27–0.28 (0.27), PW 0.35–0.36 (0.36), EL 0.55–0.57 (0.56), EW 0.42–0.44 (0.43), EI 1.30–1.31.

Distribution. Central and East-Southern Taiwan: Taitung and Nantou Counties.

Etymology. The name refers to the delicate, lightly pigmented body of this species, which is the most slender member of the group (Latin "the most delicate").

Figures

FIGURES 15 – 20. Dorsal view of Cephennomicrus (holotypes, males). 15, C. taiwanensis (Jałoszyński). 16, C. iriomotensis Jałoszyński. 17, C. nagoanus Jałoszyński. 18, C. tsurui Jałoszyński. 19, C. delicatissimus Jałoszyński. 20, C. imago Jałoszyński. Scale bars: 0.2 mm.

FIGURES 45 – 49. Details of C. nomurai (Jałoszyński & Hoshina) (45, 48), C. delicatissimus Jałoszyński (46, 49) and C. tsurui Jałoszyński (47). 45, 46, ventral view of female. 47, head of male in frontal view. 48, 49 head of female in ventral views. Abbreviations: as, antennal socket; ata, anterior tentorial arm; dta, dorsal tentorial arm; fcr, frontoclypeal region; fg, frontal gland; focc, foramen occipitale; gu, gula; lbr, labrum; man, mandible; mllt, median lamella of laminatentorium; occ, occiput; pta, posterior tentorial arm; smen, submentum; tb, tentorial bridge; tllt, transverse lamella of laminatentorium; tm, tempora; v, vertex. Scale bars: 0.2 mm (45, 46); 0.1 mm (47 – 49).

FIGURES 50 – 55. Details of C. delicatissimus Jałoszyński (50, 51), C. tsurui Jałoszyński (52) and C. nomurai (Jałoszyński & Hoshina) (53 – 55). 50, head of male in dorsal view. 51, 52, frontal gland of male in dorsal view. 53, right mandible of male in dorsal view. 54, right mandible of female in dorsal view. 55, frontoclypeal region and labrum in frontal view. Abbreviations: bm, basal membrane of labrum; dt, dorsal tooth of mandible; ma, apex of mandible; mv, marginal velum of labrum; pf, perforated field. Scale bars: 0.05 mm (50, 53 – 55); 0.01 mm (51, 52).

FIGURES 65 – 67. Details of of C. delicatissimus Jałoszyński (65, 67) and C. nomurai (Jałoszyński & Hoshina) (66). 65, head and prothorax in ventral view. 66, 67, pterothorax in ventral view. Scale bars: 0.2 mm.