Chileanthicus angulicollis, Kejval, 2009

Kejval, Zbyněk, 2009, Taxonomic revision of the genus Chileanthicus Werner (Coleoptera: Anthicidae) 2180, Zootaxa 2180 (1), pp. 1-82 : 29-31

publication ID	https://doi.org/ 10.11646/zootaxa.2180.1.1
DOI	https://doi.org/10.5281/zenodo.5321566
persistent identifier	https://treatment.plazi.org/id/3949251E-FFB1-7779-FF63-DBC0FD54F8AC
treatment provided by	Felipe
scientific name	Chileanthicus angulicollis
status	sp. nov.

Treatment

Chileanthicus angulicollis sp. nov.

( Figs 63–67 View FIGURES 63–71 , 223 View FIGURES 220–231 )

Type locality. Australia, Western Australia, near Port Hedland, Finucane Island , ca 20°18'S 118°33'E GoogleMaps .

Description (male, holotype). Head and pronotum brown black, pronotum slightly paler; elytra rufous brown, darkened, brown black in apical third; legs, antennae and palpi rufous to rufous brown.

Head 1.3 times as long as wide, nearly widely rounded posteriorly; posterior temporal angles rounded and thus somewhat less conspicuous. Eyes small to medium-sized, convex. Dorsal surface slightly glossy, densely punctured ( Fig. 63 View FIGURES 63–71 ); punctation conspicuous, double, at places somewhat heterogeneous, rather evenly dense, slightly sparser anteriorly on frons (no distinct glossy median line). Setation short, subdecumbent, with scattered, moderately longer erect setae. Antennae moderately enlarged in terminal third ( Fig. 64 View FIGURES 63–71 ); antennomere III 1.8 times as long as wide, about as long as IV; antennomere X 1.2 times, XI 1.9 times as long as wide.

Pronotum nearly as long as wide, wider than head including eyes, widely rounded to angulate anteriorly in dorsal view. Pronotal disc conspicuous, its lateral margins forming sharp edge, lateral outlines somewhat angulate at widest point of pronotum and from this place slightly sinuously narrowing towards base in dorsal view ( Figs 63 View FIGURES 63–71 , 223 View FIGURES 220–231 ). Dorsal surface slightly glossy, densely punctured; punctation similar to that of head; coarse punctures somewhat larger, shallow, nearly cell-like. Setation as on head.

Elytra 1.8 times as long as wide, conjointly rounded apically. Surface moderately glossy, distinctly punctured; punctation clearly double in basal half, becoming simple towards elytral apices in apical half, generally much sparser than on head; coarse basal punctures nearly as large/prominent as those on head ( Fig. 63 View FIGURES 63–71 ). Setation somewhat more distinct, moderately longer than on head, subdecumbent, mostly pale to brownish, with silvery setae forming two, paired, sparse and somewhat less conspicuous, transverse bands; silvery setae obliquely directed laterad, somewhat swirled medially in posterior setose band; erect setae scattered but longer and more conspicuous than on head.

Metafemora unidentate ( Fig. 65 View FIGURES 63–71 ); subapical process wide basally, narrowed and pointed apically, facing inner side of tibia. Setation rather uniformly short, fine, subdecumbent to appressed.

Abdominal sternum VII and tergum VII simple, with posterior margin evenly rounded apically. Sternite VIII ( Fig. 66 View FIGURES 63–71 ); paired prongs rather long, narrow, only moderately curved in apical half, with rounded apex, their median side dilated into rounded lobe, bearing numerous long, stiff setae apically. Tergite VIII with posterior margin simply rounded.

Aedeagus ( Fig. 67 View FIGURES 63–71 ); apical portion of tegmen 1.6 times as long as basal-piece, slightly sinuously narrowing towards subtruncate apex in dorsal view, moderately bent and widened subapically in lateral view; median lobe of aedeagus simple, with membranous apex.

Body length (♂ ♀). 3.5–3.8 mm (holotype 3.8 mm).

Variation. Both paratypes differ moderately in colouration, having a paler pronotum, and by the somewhat denser punctation of the head.

Type material. Holotype: ♂, D. D. Giuliani 7.i.1969 Finucane Island W. Australia // 70 – 3122 // Western Australian Museum Entomology Reg no. 70550 ( WAM) . Paratypes: 2 ♀♀, On fresh dung. 3-mile Wyndham. W.A. 16 april ’30 T. G. Cambell [h] // Formicomus Id. by W. K. Hughes ( ANIC) .

Differential diagnosis. C. angulicollis sp. nov. can be distinguished from most Australian species by the combination of sharp dorso-lateral edges of the pronotum, clearly double punctation of the basal half of the elytra, and unidentate metafemora. It shares these characters only with C. inflatus sp. nov., but differs externally by the body proportions (smaller relative size of elytra) and the rather rounded posterior temporal angles of the head. Furthermore, it differs clearly from the latter species by the characters of male sternite VIII and the aedeagus.

Etymology. Composed from Latin angulatus (angulate) and collum (pronotum metaphorically); named in reference to the sharp dorso-lateral edges of the pronotum.

Distribution. Australia (Western Australia).