Cephennomicrus fesumatranus, Jałoszyński, Paweł, 2010

Jałoszyński, Paweł, 2010, Notes on identity of Cephennomicrus sumatranus (Franz) (Coleoptera, Staphylinidae, Scydmaeninae), Zootaxa 2517, pp. 25-32 : 30-31

Cephennomicrus fesumatranus sp. n.

( Figs. 2 , 4, 6, 8 , 11, 12 )

Type material. Holotype: INDONESIA: ♂, two white typed labels: "Sumatra, Babahrot", "lg.Klapperich, Juli–Aug.1983 " [last digit typed as 5 and overtyped with 3], yellow label with handwritten " Neseuthia sumatrana m." and printed " PARATYPUS ", red printed label " CEPHENNOMICRUS fesumatranus m., det. P. JAŁOSZYŃSKI, 2008)" ( NHMW).

Diagnosis. This species differs from all similar congeners in having the following combination of characters: body very small, covered with extremely short but dense vestiture; head of male with shallow broadly V-shaped impression separating vertex from frontoclypeal area; median part of head raised and indistinctly separated from slightly impressed sides; base of pronotum with narrow transverse groove joining three small foveae (in middle and at each end), and with additional small lateral fovea on each side; elytra with fine, dense and relatively smooth microgranulation, with indistinct rows of granules, oblique in relation to suture. Identification must be confirmed by examination of aedeagus.

Description. BL 0.72. Body of male ( Figs. 2 , 4 ) with well marked constriction between pronotum and elytra, moderately slender and strongly convex, light brown, covered with barely noticeable vestiture similar in color to cuticle.

Head large, HL 0.10, HW 0.17, vertex convex, separated from frontoclypeal area by shallow and relatively broad V-shaped impression running from upper internal margin of each eye toward middle; median part of frontoclypeal area just anterior to tip of impression forms broad, subquadrate convexity delimited at each side by shallow but distinct impression; eyes large, coarsely faceted, moderately convex. Punctures on head extremely fine, barely noticeable at magnification 80x; setae extremely short, dense, recumbent. Antennae as in Fig. 6 , AnL 0.27.

Pronotum ( Fig. 4 ) subquadrate, broadest near anterior third, PL 0.22, PW 0.27; anterior margin broadly rounded; sides strongly rounded in anterior third, then slightly constricted between middle and posterior third, distinctly convergent toward blunt and obtuse hind angles; posterior margin nearly straight; five small antebasal foveae present, three median foveae connected by narrow and distinct transverse groove. Punctures extremely fine, dense, barely noticeable at magnification 80x, surface of pronotum relatively glossy; setae extremely short, dense and recumbent.

Elytra ( Fig. 4 ) oval, slightly more convex than pronotum and distinctly broader, broadest minimally anterior to middle, EL 0.40, EW 0.32, EI 1.25; each elytron with very small but well visible basal fovea; humeral calli well marked; humeral denticles indistinct; apices of elytra rounded together. Surface of elytra with very fine, dense and smooth microgranulation, granules form slant rows running from suture toward sides and posteriorly; setation as that on pronotum. Hind wings not studied.

Legs ( Fig. 8 ) slender, relatively short.

Ventral view as in Fig. 8 ; metaventrite not modified.

Aedeagus ( Figs. 11, 12 ) stout, bottle-shaped, AeL 0.12; apex subtriangular, blunt, slightly curved dorsally; internal armature composed of narrow median tubule surrounded at each side by lightly sclerotized, elongate subtriangular and pointed structure; parameres broad, each with one apical and one subapical seta.

Female. Unknown.

Distribution. Sumatra.

Etymology. The specific epithet is composed of the locotypical adjective " sumatranus ", by analogy to L. sumatranus , and a combination of two letters " fe- ", which is an abbreviation of " Franz erravit ", meaning "Franz has made a mistake". Despite a clearly different morphology, this species was misidentified by Herbert Franz as N. sumatrana .

Remarks. In addition to the unique shape of the aedeagus (a primary specific character in all Cephenniini ) this species differs from all known congeners in an unusual sculpture of the elytra, which are covered not with punctures but rather with very fine, dense and smooth granules that tend to form oblique rows. This sculpture is slightly similar to that known in many Leiodidae , while the elytra of Cephennomicrus are typically punctate.

In the original description Franz (1984) stated that the paratype of Neseuthia sumatrana has been collected in Pulau Kayu. However, the paratype locality label is identical to that of the holotype of N. sumatrana , i.e. "Sumatra, Babahrot".

Figures

FIGURES 1 – 2. Habitus of holotypes, males. 1 ― Lathomicrus sumatranus (Franz); 2 ― Cephennomicrus fesumatranus Jałoszyński, sp. n. Scale bars: 0.2 mm.

FIGURES 3 – 8. Holotype males of Lathomicrus sumatranus (Franz) (3, 5, 7) and Cephennomicrus fesumatranus Jałoszyński, sp. n. (4, 6, 8). 3, 4 ― simplified body outline; 5, 6 ― left antenna in dorsal view; 7, 8 ― simplified ventral view (distal parts of abdomens removed). Abbreviations: bs — basisternum; hc — humeral carina; hy — hypomeron; vp 1 — prosternal process, vp 2 — mesoventral process. Scale bars: 0.2 mm (3, 4, 7, 8), 0.05 mm (5, 6).

FIGURES 9 – 12. Aedeagus of holotype in ventral (9, 11) and lateral (10, 12) views. 9, 10 ― Lathomicrus sumatranus (Franz); 11, 12 ― Cephennomicrus fesumatranus Jałoszyński, sp. n. Scale bars: 0.05 mm.