Chileanthicus dentivarius ( Lea, 1922 ) Kejval, 2009

Kejval, Zbyněk, 2009, Taxonomic revision of the genus Chileanthicus Werner (Coleoptera: Anthicidae) 2180, Zootaxa 2180 (1), pp. 1-82 : 40-42

publication ID	https://doi.org/ 10.11646/zootaxa.2180.1.1
DOI	https://doi.org/10.5281/zenodo.5457848
persistent identifier	https://treatment.plazi.org/id/3949251E-FF8A-774E-FF63-DF4BFD54FE4B
treatment provided by	Felipe
scientific name	Chileanthicus dentivarius ( Lea, 1922 )
status	comb. nov.

Treatment

Chileanthicus dentivarius ( Lea, 1922) comb. nov.

( Figs 94–101 View FIGURES 90–101 )

Formicomus dentivarius Lea, 1922: 505 .

Type locality. Australia, Western Australia, Cue , 27°27'S 117°53'E GoogleMaps .

Redescription (male, syntype). Head and pronotum largely rufous brown; elytra brown black, with rufous lateral margins, suture and two paired bands/spots ( Fig. 94 View FIGURES 90–101 ), the anterior band larger, oblique, the posterior band rather transverse; legs, antennae and palpi rufous brown.

Head 1.2 times as long as wide, widely rounded posteriorly; tempora parallel; posterior temporal angles somewhat rounded, but distinct. Eyes small, rather convex. Dorsal surface matte, densely punctured ( Fig. 94 View FIGURES 90–101 ); punctations simple, rather evenly developed, somewhat sparser only near base. Setation short, decumbent, pale, with numerous long, erect, darker setae. Antennae moderately enlarged in terminal third; antennomere X 1.6 times, XI 2.4 times as long as wide.

Pronotum large, about as long as wide, conspicuously wider than head including eyes, widely rounded anteriorly, strongly bulging posteriorly, antebasal sulcus thus not clearly visible in dorsal view ( Fig. 94 View FIGURES 90–101 ); pronotal disc moderately convex, slightly impressed medially, near base, its lateral margins forming rounded but distinct edge, lateral outlines arcuately narrowing posteriad in dorsal view. Dorsal surface matte, densely punctured; punctation similar to that of head, but punctures larger and rather oval. Setation as on head, erect setae more numerous and conspicuous.

Elytra 1.7 times as long as wide, evenly shaped, conjointly rounded apically. Surface slightly glossy; punctation conspicuosly double ( Fig. 94 View FIGURES 90–101 ); coarse basal punctures very deep, dot-like, becoming gradually smaller towards elytral apices. Setation rather heterogeneous, mostly short, subdecumbent, brownish, silvery and distinctly swirled on elytral bands/spots ( Fig. 94 View FIGURES 90–101 ); erect setae numerous, long and conspicuous.

Metafemora tridentate ( Fig. 95 View FIGURES 90–101 ), all subapical processes narrow, pointed apically, one of them facing outer, another two inner side of tibia. Setation generally more raised, with some longer setae; meso- and especially metatibia with short, stiff, bluntly pointed setae forming apical fringe and scattered on outer side, metatibiae in addition with numerous conspicuously long, raised setae on inner side distally ( Figs 96, 97 View FIGURES 90–101 ); paired terminal spurs reduced in metatibiae.

Abdominal sternum VII and tergum VII simple. Sternite VIII ( Fig. 98 View FIGURES 90–101 ); paired prongs simple, evenly narrowing towards rounded apex, rather sparsely setose. Tergite VIII simple, with posterior margin at most slightly emarginate medially. Segment IX (spiculum) as in Fig. 99 View FIGURES 90–101 .

Aedeagus ( Figs 100, 101 View FIGURES 90–101 ); apical portion of tegmen shorter, 0.6 times as long as basal-piece, simple, evenly narrowing, with flattened, nearly sharply pointed apex; median lobe of aedeagus with membranous, densely spinulose distal portion, terminating in rounded apical lobe.

Female. Externally identical to male.

Body length. 2.8–6.2 mm.

Variation. Rather variable in size. Some specimens have the head and pronotum nearly brown black, the elytra black, and the rufous bands/spots of elytra are usually interconnected along lateral the margins. The smaller, outer subapical process of the metafemora is sometimes less distinct.

Type material. Syntypes: 1 ♂, 3 ♀♀ [mounted on the same card], dentivarius Lea , TYPE Cue [h+p] // Formicomus dentivarius Lea W. Australia. TYPE I.15262 [h; “TYPE” red] // S. Aust. Museum specimen [p; orange label] ( SAMA); 1 ♂, 2 ♀♀ [mounted on two cards, pinned together], Cue, W.A. H.W.Brown [p; three identical labels] // Co-type [p] Formicomus dentivarius Lea W. Australia. Cotype 20634 [h; “ Cotype ” red] // S. Aust. Museum specimen [p; orange label] ( SAMA) .

Differential diagnosis. C. dentivarius is a very conspicuous species, showing a robust body form, the rarely occuring tridentate metafemora, the reduced terminal spurs of the metatibiae, and the very distinct punctation and setation (dot-like punctures on the elytra, long erect setae). It shares most of these external characters and the same simple form of male sternite VIII and the aedeagus with the closely related C. mastersii from South Australia. It differs from C. mastersii by the more robust pronotum, by the arrangement of silvery setae on the elytral bands (cf. Figs 94 View FIGURES 90–101 , 160 View FIGURES 160–170 ), by the heterogeneous setation of the legs (stiff and long setae of metatibiae, Fig. 96 View FIGURES 90–101 ), by the narrow and apically rounded prongs of male sternite VIII (cf. Figs 98 View FIGURES 90–101 , 162 View FIGURES 160–170 ), and by the pointed and less narrowed/elongated apex of tegmen in ventral view (cf. Figs 101 View FIGURES 90–101 , 165 View FIGURES 160–170 ).