Dermestocyphon (Dermestocyphon) apiciconcavus, Ruta & Yoshitomi & Klausnitzer, 2013

Ruta, Rafał, Yoshitomi, Hiroyuki & Klausnitzer, Bernhard, 2013, Review of the genus Dermestocyphon (Coleoptera: Scirtidae: Scirtinae), Acta Entomologica Musei Nationalis Pragae 53 (1), pp. 253-285 : 262-263

Dermestocyphon (Dermestocyphon) apiciconcavus sp. nov.

( Figs1–2 , 38–39 , 44–47 , 52–53 , 59–62 )

Type material. HOLOTYPE: ♂ ( NMW), “ S-VIETNAM 14km SW Bao Loc 16.– 29.5.1994 Pacholatko & Dembicky ”. PARATYPE: ♀ (NMW), same data as holotype.

Diagnosis. Similar to D. drianti and D. suturalis sp. nov., D. apiciconcavus sp. nov. can be identified on the basis of the following characters: 1) coloration of legs dark brown (orange in D. drianti and D. suturalis sp. nov.), 2) pronotum with distinctly bisinuate basal margin and well marked posterior angles (especially in females), 3) a pair of deep concavities present at humeral angles of female elytra (at proximal 1/ 6 in D. drianti and D. suturalis sp. nov.), 4) oval dorsal patch and large, deep concavities present on apices of female elytra.

Description. Male. Body oblong, slightly convex dorsally, strongly shining, closely covered with easily removable short setae throughout. Coloration of head, mouthparts, antennal segments I–IV, pronotum, and scutellum yellowish-orange; antennal segments V–VIII, legs, elytra and ventral surface of meso- and metathorax and abdomen black except for yellowish apices of femora, basal parts of tibiae, and tarsi.

Head moderate in size, finely punctate, slightly convex dorsally; distance between eyes about 1.7 times as long as maximum diameter of eye. Eyes moderate in size, strongly prominent. Pronotum transverse, depressed in lateral portions, finely punctate; anterior margin straight; anterolateral angles about 120°, not projecting anteriorly; lateral margins gently arcuate; posterolateral angles about 90°; posterior margin gently bisinuate; PW/PL 2.31. Scutellum small, equilateral-triangular, finely punctate. Elytra oblong, subparallel-sided near base to apical 1/5, closely punctate; humeral portions slightly elevated; EL/EW 1.67; EL/PL 5.45; EW/PW 1.42; TL/EW 1.97. Legs relatively long.

Tergite VII with a pair of short apodemes. Caudal margin of sternite VII arcuate. Sternite IX (L 0.25 mm, W 0.37 mm) slightly sclerotized, semicircular, bearing short setae in apical portion; tergite VIII (L 0.46 mm, W 0.39 mm) moderately sclerotized, arcuate at caudal margin, bearing short setae, closely covered with minute setae and punctures, with a pair of relatively long apodemes; tergite IX membranous. Tegmen short (L 0.21 mm, W 0.21 mm), slightly sclerotized; parameres short, widening apically, obtuse; lateral rods long (L 0.46 mm), pointed at apices. Penis (L 0.50 mm, W 0.20 mm) moderately sclerotized, widest at middle; pala oval, shallowly concave at basal margin; parameroids relatively short, slender, closely punctate; trigonium short, wide at basis, triangular, minutely serrate at apex.

Female. Sexual dimorphism distinct; pronotum slightly projecting in anterolateral angles, acute in posterolateral angles, basal margin distinctly bisinuate; humeral portions of elytra depressed anterolaterally, with deep and diagonal concavities at humeral margin; a pair of crescent-shaped flat areas present in apical 1/4 of elytra, black, closely covered with fine setae; a pair of large and deep excitators present near apices of elytra, ear-like shaped, extending outwards to form S-shaped structures ( Fig. 45 ); PW/PL 2.30; EL/EW 1.87; EL/PL 5.13; EW/PW 1.20; TL/EW 2.23.

Caudal margin of sternite VII somewhat pointed. Ovipositor relatively long (L 1.60 mm); coxites punctate in apical portions; proctiger well sclerotized, cup-shaped, with a pair of subconical projections bearing short spines. Proximal bursellar sclerite (L 0.20 mm, W 0.31 mm) tricornate at anterior margin, with long median projection; distal bursellar sclerites consisting of two plate-like, elongate oval structures (L 0.15 mm).

Measurements. Male (n = 1): TL 3.55 mm; PW 1.27 mm; PL 0.55 mm; EL 3.00 mm; EW 1.80 mm. Female (n = 1): TL 3.68 mm; PW 1.38 mm; PL 0.60 mm; EL 3.08 mm; EW 1.65 mm.

Etymology. The name refers to the presence of the concave excitator at the elytral apex of the female (Latin apici- standing for apex, Latin concavus = concave).

Distribution. Vietnam, known only from the type locality.

Figures

Figs 1–6. Habitus of Dermestocyphon (Dermestocyphon): 1 – D. apiciconcavus sp. nov., holotype, male; 2 – ditto, paratype, female; 3 – D. drianti (Pic, 1918), holotype, male and labels; 4 – ditto, female; 5 – D. suturalis sp. nov., paratype, male; 6 – ditto, female. Scale bar = 1.0 mm.

Figs 38–43. Pronotum of male (38, 40, 42) and female (39, 41, 43): 38–39 – D. apiciconcavus sp. nov.; 40–41 – D. drianti (Pic, 1918); 42–43 – D. suturalis sp. nov.

Figs. 44–51. Excitators of females of D. apiciconcavus sp. nov. (44–47), D. drianti (Pic, 1918) (48–49), and D. suturalis sp. nov. (50–51): 44, 46, 48–51 – Humeral area in lateral view; 45, 47 – apex of elytra in lateral (45) and caudal (47) view.

Figs 52–58. Dermestocyphon (Dermestocyphon) spp., female genitalia: ovipositor (52, 54, 56), bursella (53, 55, 57), and distal bursellar sclerite (58): 52–53 – D. apiciconcavus sp. nov.; 54–55 – D. drianti (Pic, 1918); 56–58 – D. suturalis sp. nov.

Figs 59–62. Dermestocyphon (Dermestocyphon) apiciconcavus sp. nov., holotype, male genitalia: 59 – sternite IX; 60 – tergite VIII; 61 – tegmen with lateral projections; 62 – penis. Scale bar = 0.5 mm.