Chileanthicus tuberculifer, Kejval, 2009

Kejval, Zbyněk, 2009, Taxonomic revision of the genus Chileanthicus Werner (Coleoptera: Anthicidae) 2180, Zootaxa 2180 (1), pp. 1-82 : 74-75

Chileanthicus tuberculifer sp. nov.

( Figs 204–208 )

Type locality. Australia, Western Australia, 17.5 km SE of Burranbar Pool, on Savory Creek , 23°55'23.1"S 120°31'51.6"E .

Description (male, holotype). Head and pronotum rufous brown; elytra largely brown, with paler, rufous brown lateral margins, suture (more extensively in basal half) and with two, rufous, vaguely outlined, transverse bands ( Fig. 204 ); bands fused medially with paler suture and less conspicuous (set off rather by silvery setation), the anterior one widened laterally and touching lateral margin; legs and palpi rufous; antennae rufous brown.

Head 1.3 times as long as wide, moderately widely rounded posteriorly in dorsal view; tempora slightly narrowing posteriad; posterior temporal angles indicated. Eyes small, moderately convex. Dorsal surface matte, very densely punctured ( Fig. 204 ); punctation simple, evenly developed, punctures shallow and nearly contiguous. Setation short, appressed, with scattered slightly longer, inconspicuous erect setae. Antennae moderately enlarged in terminal third; antennomere III 1.8 times as long as wide, as long as IV; antennomere X 1.3 times, XI 1.8 times as long as wide.

Pronotum slightly longer than wide and slightly wider than head, rather widely rounded anteriorly in dorsal view. Pronotal disc moderately convex, ist lateral margins forming rouded edge, lateral outlines slightly sinuously narrowing towards base in dorsal view. Dorsal surface matte, densely punctured; punctation similar to that on head, punctures slightly larger and rather oval shaped. Setation as on head.

Elytra 1.7 times as long as wide, conjointly rounded apically. Surface slightly glossy, rather densely punctured ( Fig. 204 ); basal punctation simple, distinctly finer and sparser than on head. Setation somewhat longer than on head, subdecumbent setae mostly brownish and evenly directing posteriad, setae on rufous transverse bands whitish/silvery and moderately swirled (medially), forming distinct setose bands; erect setae sparsely scattered and inconspicuous.

Metafemora unidentate ( Fig. 205 ), subapical process large, pointed apically, facing inner side of tibia. Setation rather uniformly short, fine, appressed.

Abdominal sternum VII nearly evenly rounded posteriorly, with a pair of distinct admedian protuberances and fine transverse sulcus along posterior margin ( Fig. 206 ). Tergum VII simple. Sternite VIII ( Fig. 207 ); paired prongs arcuately curved mediad, with a small membranous lobe laterally, generally somewhat less sclerotized and richly setose, bearing numerous stiff setae ventrally near inner margin. Tergite VIII simple, with posterior margin evenly rounded.

Aedeagus ( Fig. 208 ); apical portion of tegmen 1.6 times as long as basal-piece, narrow, with a pair of small lateral lobes, and apex of tegmen simply rounded in ventral view; median lobe simple, with dorsal (inner) surface finely spinulose, and with membranous apex.

Female. Unknown.

Body length (♂). 3.9 mm.

Type material. Holotype: ♂, WA: Little Sandy Desert 24°55'23.1"S, 120°31'51.6"E 17.5 km SE Burranbar Pool on Savory Creek April 1997 S. van Leeuwen, B. Bromilow // bucket pitfall trap, ethylene glycol & formaldehyde open low Acacia aneura woodland LSD-S3-F1 // Western Australian Museum Entomology Reg no. 70644 ( WAM).

Differential diagnosis. C. tuberculifer sp. nov. differs from most species by the combination of unidentate metafemora, rather rounded lateral margins of the pronotal disc (no sharp edge), generally rather short body setation (erect setae inconspicuous), simply punctured elytra, with paler markings and setose bands, and matte, very densely, simply punctured head and pronotum. It can be easily recognized by the presence of paired protuberances on sternum VII (unique character), and by the peculiar and quite distinctive morphology and setation of sternite VIII.

Etymology. Composed from Latin tubercule (tubercle, bulge) and ferre (carry, bear); named in reference to morphology of male sternum VII (presence of paired tubercle).

Distribution. Australia (Western Australia).

Figures

FIGURES 201–208: Chileanthicus speciosus (King), male, holotype: 201, metafemur and tibia; 202, sternum VII; 203, segment IX (spiculum); C. tuberculifer sp. nov., male, holotype: 204, body form and punctation of head (top) and elytra (bottom); 205, metafemur; 206, sternum VII; 207, sternite VIII; 208, aedeagus in ventral (right) and lateral (left) view. Scale (1.0 mm): A, 204; B, 205, 206; C, 201; (0.5 mm): B, 208; D, 202, 203; E, 207.