Microscydmus (Microscydmus) bicavatus, Jałoszyński, Paweł, 2009

Jałoszyński, Paweł, 2009, First record of Microscydmus Saulcy & Croissandeau, 1893 from China, with descriptions of two new species (Coleoptera: Scydmaenidae), Zootaxa 2078, pp. 63-68 : 64-66

Microscydmus (Microscydmus) bicavatus sp. n.

( Figs. 1–7 )

Type material. Holotype: CHINA: 3, " CHINA: Yunnan [ CH 07-11], Baoshan Pref., Gaoligong Shan, nr. Xiaoheishan N.R., 35 km SE Tengchong, 2110 m, 24°50'16''N, 98°45'43''E, decid. forest, litter, sifted, 30.V.2007, leg. A. Pütz" [white, printed], " Microscydmus (s. str.) bicavatus m., det. P. JAŁOSZYŃSKI '08, HOLOTYPUS " [red, printed] (CAP).

Diagnosis. This species differs from all congeners in having very large, brown eyes, very dense, large and deep punctures on the vertex and frons, impressed apices of elytra bearing modified setae, and unique aedeagus with very simple internal armature, very long apical part of median lobe, and extremely long apical setae on parameres.

Description. BL 0.94. Body of male ( Figs. 1, 2 ) slender, slightly flattened, pigmentation moderately light brown, eyes brown, slightly lighter than head; vestiture light brown.

Head strongly transverse, broadest at eyes, HL 0.15, HW 0.23; occipital constriction as broad as 2/3 of vertex; tempora long, strongly convergent posteriorly, weakly arcuate; vertex and frons regularly rounded; supraantennal tubercles weakly raised but distinct; eyes very large, strongly convex, nearly circular, coarsely faceted, located slightly posterior to middle of head. Vertex and frons covered with very dense, deep, large and sharply marked punctures separated by spaces about equal to puncture diameters; setae short, sparse and suberect, except those on posterior margin of vertex and tempora, which are slightly longer and thicker, and strongly erect posteriorly. Antennae moderately long and slender, as in Fig. 3 , AnL 0.41.

Pronotum in dorsal view nearly circular, with slightly projected basal part, broadest distinctly anterior to middle, PL 0.26, PW 0.28; anterior and lateral margins confluent, strongly rounded; sides in posterior third indistinctly, shallowly S-shaped; hind angles well marked, slightly obtuse; posterior margin weakly arcuate; base with median pair of large, transversely oval, connected foveae and very small, barely recognizable lateral pit near each hind angle. Punctures on disc very fine and sparse; setae sparse, short, suberect to erect.

Elytra oval, slightly rhomboidal, as convex as pronotum, broadest minimally anterior to middle, EL 0.53, EW 0.40, EI 1.31; humerus on each elytron moderately distinct; base with very small fovea surrounded by large and deep basal impression; narrow adsutural region in anterior half of each elytron slightly impressed; apices of elytra ( Fig. 4 ) separately rounded, strongly modified, each shallowly impressed, delimited from external margin of elytra by diffused protuberance. Punctures more distinct than those on pronotum, fine, shallow and moderately dense; basic setation slightly shorter than that on pronotum, moderately dense, suberect; apical impression on each elytron provided with long, nearly recumbent setae, subapical lateral protuberance with group of very short but very thick setae, additionally lateral margin in subapical area bears two very large, strongly erect setae. Hind wings well developed, about twice as long as elytra.

Legs moderately long, with very stout, short tarsi; protibibiae with slightly modified apices, as in Fig. 5 . Venter as in Fig. 2 (abdomen removed).

Aedeagus ( Figs. 6, 7 ) 0.18 mm in length, elongate, with subtriangular, pointed apex; internal armature simple and lightly sclerotized, with bell-shaped structure in subapical region of median lobe; parameres thick, each bearing single, very long and curved apical seta.

Female. Unknown.

Distribution. China: Yunnan.

Etymology. The specific epithet composed of the prefix " bi -" (two) and Latin " cavus " (hollow, excavated) refers to the remarkable apical impressions on the elytra.

Figures

FIGURES 1 – 7. Microscydmus bicavatus Jałoszyński, holotype male. 1 ― dorsal aspect; 2 ― ventral aspect (abdominal segments removed); 3 ― right antenna in dorsal view; 4 ― apical part of right elytron in dorsal view; 5 ― apical part of protibia and tarsus in lateral view; 6 ― aedeagus in ventral view; 7 ― aedeagus in lateral view. Differences in the shape of elytral apices are due to slightly different perspective. Scale bars 0.2 mm (1, 2), 0.1 mm (3 – 7).