Chileanthicus discus, Kejval, 2009

Kejval, Zbyněk, 2009, Taxonomic revision of the genus Chileanthicus Werner (Coleoptera: Anthicidae) 2180, Zootaxa 2180 (1), pp. 1-82 : 42-44

publication ID	https://doi.org/ 10.11646/zootaxa.2180.1.1
DOI	https://doi.org/10.5281/zenodo.5321602
persistent identifier	https://treatment.plazi.org/id/3949251E-FF84-774C-FF63-DF6DFD54FEE0
treatment provided by	Felipe
scientific name	Chileanthicus discus
status	sp. nov.

Treatment

Chileanthicus discus sp. nov.

( Figs 102–107 View FIGURES 102–111 , 226 View FIGURES 220–231 , 241 View FIGURES 232–241 )

Type locality. Australia, Western Australia, NW Cape Peninsula, near Cave C 163, 22°07'S 114°00'E GoogleMaps .

Description (male, holotype). Head and pronotum rufous, darker dorsally; elytra pale brown with two transverse, vaguely outlined, pale yellowish bands, narrowly interrupted on suture ( Figs 102 View FIGURES 102–111 , 226 View FIGURES 220–231 ); the anterior band widened laterally and extending along lateral margin towards base; legs and palpi yellowish rufous; antennae rufous, paler in terminal third.

Head 1.2 times as long as wide, widely rounded to angulate posteriorly in dorsal view, somewhat flattened, with rather sharply angled margins posteriorly; tempora moderately divergent; posterior temporal angles distinct. Eyes medium-sized, convex, situated rather dorso-laterally, above angled lateral margins ( Fig. 241 View FIGURES 232–241 ). Dorsal surface moderately glossy, distinctly punctured ( Fig. 102 View FIGURES 102–111 ); punctation nearly simple, rather evenly developed. Setation short, inconspicuous, subdecumbent to appressed, with a few moderately longer, erect setae. Antennae only slightly enlarged in terminal third; antennomere III 1.8 times as long as wide, slightly shorter than IV; antennomere X 1.4 times, XI 2.3 times as long as wide.

Pronotum slightly longer than wide, distinctly wider than head, widely rounded anteriorly in dorsal view. Pronotal disc conspicuous, moderately convex, its lateral margins forming sharp edge ( Fig. 241 View FIGURES 232–241 ), lateral outlines somewhat sinuously narrowing towards base in dorsal view. Dorsal surface nearly matte, distinctly punctured to corrugated ( Fig. 102 View FIGURES 102–111 ); punctation simple, rather evenly developed, sparser and finer only near collar and base; punctures much larger than those of head, oval, shallow, nearly contiguous. Setation as on head.

Elytra 1.9 times as long as wide, conjointly rounded apically. Surface moderately glossy; basal half punctation similar to that of head. Setation somewhat longer than on head, subdecumbent setae with brownish tinge on darker coloured places, pale to silvery on pale elytral bands, all rather evenly directing posteriad; erect setae longer, rather numerous and distinct.

Metafemora unidentate ( Fig. 103 View FIGURES 102–111 ), subapical process large, pointed apically, facing inner side of tibia; mesotibiae with minute denticle on inner side apically; metatibiae with apical inner margin produced into conspicuous, pointed process ( Fig. 104 View FIGURES 102–111 ). Setation rather uniformly short, fine, appressed.

Abdominal sternum VII with posterior margin somewhat unevenly rounded, at most slightly emarginate medially. Tergum VII simple. Sternite VIII ( Fig. 105 View FIGURES 102–111 ); paired prongs simply bilobed distally, sparsely setose. Tergite VIII simple, with posterior margin evenly rounded. Segment IX (spiculum) as in Fig. 106 View FIGURES 102–111 .

Aedeagus ( Fig. 107 View FIGURES 102–111 ); apical portion of tegmen 2.3 times as long as basal-piece, narrowed and with wide, dorso-ventrally flattened, triangular and moderately upturned apex; median lobe terminating in a pair of conspicuously long, well-sclerotized, hook-like curved projections.

Female. Unknown.

Body length (♂). 3.4 mm.

Type material. Holotype: ♂, WA 22.07S 114.00E N-W Cape Penin. nr. Cave C 163 2June 1990 J. M. Waldock CR’90 #305 ( ANIC). GoogleMaps

Differential diagnosis. C. discus sp. nov. is externally nearly identical and undoubtedly very closely related to C. exul sp. nov., as is suggested also by similarity of all male characters (the same modification of the metatibiae, median lobe with the same peculiar, hook-like curved projections), and the closely situated type localities. C. discus sp. nov. differs from the latter species by the punctation of the head, which is distinctly finer and sparser than that on pronotum, and by the triangulate apex of the tegmen (ventral view, cf. Figs 107, 111 View FIGURES 102–111 ).

Etymology. Named in reference to the conspicuous, sharply delimited pronotal disc.

Distribution. Australia (Western Australia).