Cephennomicrus taitungensis, 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 : 21-22

Cephennomicrus taitungensis sp. n.

( Figs. 38 , 43, 44 )

Type material. Holotype: TAIWAN: 3, " 11.IV.2007, leg. S. Vit., Rd. no. 9, Luyeh (high hinterland), Taitung Co., TAIWAN merid., dec. wood rests (alt. ± 900 m)" (white, printed) ( PCSV). Paratypes: TAIWAN: 233, " 10.IV.2007, leg. S. Vit, Rd. no. 20, km.184, bfr. Wulu, Taitung Co., TAIWAN merid., decay. trunc + termites (alt. ± 600 m.)" (white, printed) ( PCSV).

Diagnosis. Aedeagus short, with well delimited, subtriangular apical part, very short and relatively simple internal armature composed of subapically located tubular structure gradually narrowing toward pointed apex, dorsal wall of median lobe with narrow, triangular and pointed apex, each paramere with single apical seta of peculiar shape and two typical, non-modified subapical setae. Externally this species differs from Japanese and Taiwanese congeners in having very small body (ca. 0.75 mm), but this feature is not unique when Oriental species are concerned and identifications must be confirmed by examination of the aedeagus.

Description. BL 0.72–0.77 (0.76). Body of male ( Fig. 38 ) very small, relatively convex, elongate, with shallow but well marked constriction between pronotum and elytra, pigmentation light reddish-brown, vestiture slightly lighter than body.

Head moderately large, HL 0.10–0.12 (0.11), HW 0.19–0.20 (0.19), vertex and frons convex, rounded together, without modifications except for very small frontal glands, each located at internal anterior margin of eye and comparable in diameter to single ommatidium; eyes moderately large, coarsely faceted, moderately convex. Punctation of frons and vertex distinct, composed of moderately dense, small and moderately sharply marked punctures; setae extremely short, moderately sparse, suberect. Antennae short and relatively compact, with large club composed of small antennomere IX and very large antennomeres X–XI, AnL 0.27–0.29 (0.28); antennomere I about 1.6x as long as broad, II slightly narrower and shorter than I, about 1.6x as long as broad; III–IV equal in length and width, each much narrower than II and minimally broader than long; V–VI equal in width and length, each as narrow as IV but slightly longer, about as long as broad; VII barely noticeably broader and longer than VI, as long as broad; VIII barely noticeably shorter and narrower than VII, slightly transverse; IX distinctly broader and longer than VIII, broader than long; X much broader and longer than IX, slightly broader than long; XI about as broad as X but minimally longer, slightly longer than broad.

Pronotum subquadrate in shape, broadest near anterior third, PL 0.22–0.23 (0.23), PW 0.27–0.28 (0.28); anterior margin moderately rounded; lateral margins strongly rounded in anterior third, sides in posterior 2/3 nearly straight, distinctly microserrate, slightly convergent toward blunt, slightly obtuse hind angles; posterior margin nearly straight; base of pronotum with two lateral pairs of small and shallow but distinct pits, each pair is located close to hind angle, distance between pairs exceeds 1/3 width of pronotum. Punctation of disc composed of very dense but very small and shallow, moderately sharply marked punctures except for area posterior to ante-basal pits covered with larger, more distinct punctures; basic vestiture very short and dense, recumbent to slightly suberect, sides with distinctly suberect setae, additionally each lateral margin bears two very long, posteriorly curved setae inserted anterior to middle and near hind angle.

Elytra oval and elongate, broadest distinctly anterior to middle, about as convex as pronotum and only slightly broader, EL 0.40–0.42 (0.42), EW 0.32–0.35 (0.34), EI 1.20–1.25. Basal pit on each elytron very small but distinct, connected to distinct elongate impression running posteriorly and toward lateral margin of elytra, that separates rounded and well marked humeral callus; apices of elytra separately rounded. Punctation of elytra less distinct than that on central part of pronotum, composed of very small and shallow, dense but very indistinct punctures; basic vestiture similar to that on pronotum, additionally each elytron bears three very long and posteriorly curved setae near lateral margin, located near humerus, in middle or slightly anterior to middle, and near posterior fourth of elytron. Hind wings well developed.

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

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

Aedeagus ( Figs. 43, 44 ) small, AeL 0.15, in ventral view drop-shaped, with broad, slightly emarginate base and subtriangular apical part well delimited by rapid narrowing of lateral walls, apical part of ventral wall broad and blunt, apical part of dorsal wall narrow and pointed; internal armature relatively simple, composed of single tubular structure located in subapical area of median lobe; parameres slender, not exceeding apex of median lobe, each bearing one long, broadened in middle apical seta and two nonmodified, shorter subapical setae.

Female unknown.

Distribution. East-Southern Taiwan, Taitung County.

Etymology. Locotypical, after the type locality, Taitung Hsien.

Remarks. Cephennomicrus taitungensis is the most slender of all species known to occur in Taiwan. However, due to poorly known Cephenniini fauna of this species-rich island, only structures associated with the aedeagus provide reliable diagnostic characters.

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.