Dermestocyphon (Himacyphon), 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 : 278-279

Subgenus Himacyphon subgen. nov.

Type species. Cyphon optatus Klausnitzer, 1980 , by present designation.

Diagnosis. Body elongate oval ( Figs 14–16 ), coloration yellowish-brown to black; segment III of labial palpi arising from the apex of segment II ( Fig. 23 ); mandibles triangular, with narrow and pointed apical portion ( Fig. 21 ); Females always with adscutellar excitators ( Figs 15–17 ), in some species also with apical excitators present. Basal portion of elytra (♀) with microreticulated, opaque area, similar areas are present near lateral and apical margins of elytra in some species ( Figs 111, 115 ). Bursella with tricornate proximal sclerite ( Figs 110 , 117, 118 ); proctiger moderately sclerotized ( Fig 109 ); sternite VII (♀) with a membranous flap ( Figs 35, 36 , 116 ). Groove on tergite VII (♀) indistinct ( Figs 37 , 116 ).

Description. Body moderately small, elongate oval, sides rounded, covered with semi-erect setae that are easily broken. Coloration of dorsum variable, from pale yellow to entirely black.

Head small, labrum transverse, with straight anterior edge, slightly wider than clypeus, which has subtly rounded anterior margin. Eyes relatively small, distance between bottom edge of eye and genal ridge ca. 1/10 diameter of eye; antennomeres II and III ca. 2/3 length of antennomere I, antennomere IV as long as antennomeres I and II combined; segment III of labial palpi arising from end of segment 2; galea with a row of regularly arranged setae and a tuft of longer ones, which are irregularly arranged; mandibles triangular, stout, with narrow and pointed apical portion, inner edge without teeth.

Pronotum small, about 60–65 % of maximum width of elytra, about 2.2 times as wide as long, anterior angles subtly projecting forward, posterior angles almost right-angled, sides subtly rounded, basal margin bisinuate, with complete margination. Elytra without raised longitudinal carinae, sides rounded, punctures stronger than on pronotum, epipleura relatively wide, narrowing in the middle of their length. Pronotal process small, narrow, setose; mesoventral notch for reception of prosternal process present, small; mesoventral process long, narrow, apex narrow but bifid; metaventral discrimen reaching 3/4 length of the metaventrite.

Male tergite VIII broad, apical portion well sclerotized, covered with sparse setae, apodemes short; tergite IX membranous with weakly sclerotized plate and relatively long apodemes; sternite IX trapezoidal, with setae on apical portion. Tegmen small, weakly sclerotized, Ushaped with long lateral rods. Penis with narrow parameroids, trigonium triangular, pointed apically, basal margin of pala shallowly excised.

Female with distinct excitators on elytra, which are present either only in adscutellar portion in a form of depressions with fungiform outgrowths or also in apical portion and densely microreticulated patches located near basal and lateral portions of elytra. Sternite VII with membranous flap; tergite VII with indistinct groove; ovipositor long, coxites narrow, membranous, styli short, apical; proctiger moderately sclerotized, proximal bursellar sclerite with sharp carinae on ventral portion, distal portion of bursella without sclerotized structures.

Etymology. Name refers to the area inhabited by members of the subgenus – Himalaya Mountains.

Key to species

1. Elytra with adscutellar excitators only, scutellum in ♀ flat. .............................................. .......................................................................................... D. optatus ( Klausnitzer, 1980)

– Elytra with adscutellar and apical excitators, scutellum in ♀ very convex. ..................... ....................................... D. ( Himacyphon ) sp. (known from a single female specimen)

Figures

Figs 7–17. Habitus of Dermestocyphon (Oreocyphon) (7–13) and Dermestocyphon (Himacyphon subgen. nov.) (14-17): 7 – D. brancuccii sp. nov., holotype; 8 – D. honorus (Klausnitzer, 1980), male; 9 – ditto, female; 10 – ditto, apex of elytra; 11 – D. niisatoi sp. nov., paratype; 12 – D. thailandicus sp. nov., holotype, male; 13 – D. umbratilis, (Klausnitzer, 1976), female; 14 – D. optatus (Klausnitzer, 1980), male; 15 – ditto, female; 16 – D. sp., female; 17 – ditto, frontal view. Scale bars = 1.0 mm (7–9, 11–16).

Figs 18–26. Mouthparts of Dermestocyphon (males); 18, 21, 24 – mandible; 19, 22, 25 – maxilla; 20, 23, 26 – labium: 18–20 – D. drianti (Pic, 1918); 21–23 – D. optatus (Klausnitzer, 1980); 24–26 – D. niisatoi sp. nov.

Figs 111–115.Dermestocyphon (Himacyphon) sp., female:111 – left elytron, light micrphotography:A, B – fungiform excitators, C, D, E – microreticulated patches; 112 – adscutellar excitator (A), close-up, light microphotography; 113 – apical excitator (B), close-up, light microphotography; 114 – lateral microreticulated patch (D), close-up, light microphotography; 115 – dorsolateral view.

Figs 107–110.Dermestocyphon (Himacyphon) optatus (Klausnitzer, 1980), female:107 – sternite VIII; 108 – tergite VIII; 109 – ovipositor; 110 – bursal sclerite. Scale bar = 0.5 mm (107–108).

Figs 116–120. Dermestocyphon (Himacyphon) sp., female: 116 – sternite and tergite VII; 117 – female genital tract; 118 – bursella with proximal bursellar sclerite; 119 – priximal bursellar sclerite, lateral view; 120 – bursella, close-up. Scale bar = 0.5 (117).

Figs 30–37. Last visible sternite (30, 32, 35), membranous flap (33, 36) and tergite VII (31, 34, 37) of female: 30–31 – D. suturalis sp. nov.; 32–34 – D. honorus (Klausnitzer, 1980); 35–37 – D. optatus (Klausnitzer, 1980).