Dermestocyphon (Oreocyphon)

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 : 269-270

Subgenus Oreocyphon Klausnitzer, 2009 , stat. nov.

Oreocyphon Klausnitzer, 2009 : 81 (subgenus of Cyphon ).

Type species. Cyphon honorus Klausnitzer, 1980 .

Diagnosis. Body oval ( Figs 7–9, 11–13 ), coloration yellowish-brown to black, dorsum often with colour pattern, very variable in some species; segment III of labial palpi arising from terminal part of segment II ( Fig. 26 ); mandibles triangular, with short and wide apical portion ( Fig. 24 ); Females with one apical excitator close to the elytral suture ( Figs 9, 10, 13 ). Distal portion of bursella with four oval structures covered with minute setae ( Figs 84, 85 , 99 ); proximal bursellar sclerite absent; proctiger membranous, slightly sclerotized ( Fig. 102 ); sternite VII (♀) with a membranous flap ( Figs 32, 33 , 96, 97 ). Concave groove on tergite VII (♀) well developed ( Figs 34 , 98 ).

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

Head small, labrum transverse, with straight anterior edge, slightly wider than clypeus, which has subtly rounded anterior margin. Eyes relatively small, bottom edge of eye meeting genal ridge; antennomeres II and III ca. 1/2 length of antennomere I, which is as long as antennomere IV, antennomere II globular; segment 3 of labial palpi arising from end of segment 2; galea with two rows of regularly arranged setae; mandibles triangular, stout, with short apical portion, inner edge without teeth.

Pronotum small, about 60 % of maximum width of elytra, about 2.2–2.9 times as wide as long, anterior angles subtly projecting forward, posterior angles almost right-angled, sides rounded, basal margin bisinuate, with complete margination. Elytra without raised longitudinal carinae, sides rounded, punctures stronger than on pronotum, epipleura wide in basal portion, narrowing in the middle of its length. Pronotal process well developed, tear-shaped, setose; mesoventral notch for reception of prosternal process well developed; mesoventral process relatively short, wide, apex distinctly bilobed; 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. Parameroids of penis narrow or widening apically, trigonium narrowly triangular, pointed apically, to narrow and parallel-sided, basal margin of pala shallowly to deeply excised.

Female with distinct transversely oval excitators in apical portion of elytra. Sternite VII with membranous flap; tergite VII with distinct groove; ovipositor long, coxites narrow, membranous, styli short, apical; proctigers membranous, proximal bursellar sclerite absent, distal portion of bursella with 4 sclerotized oval structures covered with setae.

Key to species

The present key enables the identification of males, females are only known for two species.

1. Penis shallowly concave at basal margin ( Figs 77 , 90 , 95 ); distributed in Indochina. .. 2

– Penis deeply concave at basal margin ( Fig. 83 ); distributed in the Himalayas. ............. 4

2. Apex of trigonium pointed conically ( Figs 77, 78 ). Pronotum, scutellum and elytra completely black ( Fig. 7 ). ................................................................... D. brancuccii sp. nov.

– Apex of trigonium concave ( Figs 90 , 95 ). Pronotum, scutellum, and sometimes also elytral pattern yellowish-orange ( Figs 11–12 ). .......................................................................... 3

3. Punctation of elytra very dense, punctures separated by ca. 0.3 diameter; humeral and apical part of elytra yellowish-orange ( Fig. 11 ); trigonium subtriangular, sides converging apically ( Fig. 90 ). .............................................................................. D. niisatoi sp. nov.

– Punctation of elytra sparser, punctures separated by ca. 0.5 diameter; elytra black without color pattern ( Fig. 12 ); trigonium with subparallel margins ( Fig. 95 ) .............................. .................................................................................................... D. thailandicus sp. nov.

4. Pronotum and elytra evenly dark brown ( Fig. 13 ). .... D. umbratilis ( Klausnitzer, 1976)

– Pronotum yellowish-orange, very rarely dark brown; elytra black with yellowish-orange markings on humeral portions ( Figs 8–9 ). ..................................................................... 6

5. Apex of trigonium very narrow, not excised; sclerotization of apical portion not distinctly different from basal portion of trigonium. Anterior pronotal margin extended slightly forward. Elytra with narrow yellowish-brown stripe around humeri. ............................... ............................................................................. D. anticetestaceus ( Klausnitzer, 1980)

– Apex of trigonium relatively broad, distinctly excised; apical portion (L 0.06) distinctly more sclerotized than basal portion. Anterior pronotal margin almost straight. Elytra with humeri and apex extensively yellowish-brown or with only narrow yellowish-brown marks around humeri ( Figs 8–9 ). ............................................. D. honorus ( Klausnitzer, 1980)

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 84–85. Dermestocyphon (Oreocyphon) honorus (Klausnitzer, 1980), female genitalia: 84 – genital tract; 85 – bursellar sclerite.

Figs. 96–102. Dermestocyphon (Oreocyphon) umbratilis (Klausnitzer, 1976), female: 96 – membranous flap on sternite VII; 97 – sternite VII; 98 – tergite VII; 99 – sclerite of bursella; 100 – tergite VIII; 101 – sternite VIII; 102 – ovipositor. Scale bar = 0.5 mm (97, 98, 100–102).

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).

Figs 74–78. Dermestocyphon (Oreocyphon) brancuccii sp. nov., holotype, male: 74 – sternite IX; 75 – tergite VIII; 76 – tegmen with lateral projection; 77 – penis; 78 – trigonium, close–up. Scale bar = 0.5 mm.

Figs 86–90. Dermestocyphon (Oreocyphon) niisatoi sp. nov., holotype, male genitalia: 86 – sternite IX; 87 – tergite VIII; 88 – tergite IX; 89 – tegmen with lateral projections; 90 – penis. Scale bar = 0.5 mm.

Figs 91–95. Dermestocyphon (Oreocyphon) thailandicus sp. nov., holotype, male: 91 – sternite IX; 92 – tergite VIII; 93 – tergite IX; 94 – tegmen with lateral projections; 95 – penis. Scale bar = 0.5 mm.

Figs 79–83. Dermestocyphon (Oreocyphon) honorus (Klausnitzer, 1980); male genitalia:79 – sternite IX; 80 – tergite VIII; 81 – tergite IX; 82 – tegmen with lateral projections; 83 – penis. Scale bar = 0.5 mm.