Chileanthicus gammon, Kejval, 2009

Kejval, Zbyněk, 2009, Taxonomic revision of the genus Chileanthicus Werner (Coleoptera: Anthicidae) 2180, Zootaxa 2180 (1), pp. 1-82 : 47-48

Chileanthicus gammon sp. nov.

( Figs 118–122 )

Type locality. Australia, South Australia, Gammon Ranges Nat. Park, 2 km NE of Owieandana, Aroona Creek.

Description (male, holotype). Head largely brown black; pronotum rufous brown to dark brown (anteriorly), with pale rufous basal margin; elytra unicoloured brown black; legs, antennae and palpi rufous brown, distal, enlarged portion of femora darkened.

Head 1.2 times as long as wide, rather widely rounded posteriorly; tempora moderately narrowing posteriad; posterior temporal angles rounded but distinct. Eyes small, moderately convex. Dorsal surface at most moderately glossy, distinctly, rather densely punctured; punctation somewhat heterogeneous, not clearly double, coarser punctures less prominent ( Fig. 118 ); punctures slightly sparser medially on frons and before base, but glossy, median longitudinal line inconspicuous. Setation pale to brownish, uniformly short, subdecumbent to appressed, with a few, short, erect setae. Antennae only slightly enlarged distally; antennomere III 1.8 times as long as wide, about as long as IV, antennomere X 1.6 times, XI 2.2 times as long as wide.

Pronotum 1.2 times as long as wide, at most slightly wider than head including eyes, rounded anteriorly; pronotal disc only moderately convex, its lateral margins forming rather rounded edge, lateral outlines nearly straightly narrowing posteriad. Dorsal surface at most moderately glossy; punctation nearly as on head. Setation as on head

Elytra 1.7 times as long as wide, conjointly rounded apically. Surface moderately glossy, densely punctured ( Fig. 118 ); basal punctation finer than on head, simple, punctures at places somewhat serial, arranged in short oblique rows. Setation moderately longer and coarser than on head, mostly subdecumbent and brownish coloured, with silvery setae forming two, paired transverse bands, distinctly swirled medially ( Fig. 118 ); setose bands widened and narrowly interconnected along lateral margins; with sparsely scattered, very short and quite inconspicuous erect setae.

Metafemora unidentate ( Fig. 119 ), subapical process strong, pointed, facing inner side of tibia; mesotibiae with minute denticle on inner side apically; metatibiae simple. Setation mostly short, subdecumbent; metatibiae with longer, more raised setae on inner side distally.

Abdominal sternum VII and tergum VII simple. Sternite VIII ( Fig. 120 ); paired prongs strongly narrowed at about mid-length and then strongly lobed mediad, their apical widened portion dorso-ventrally flattened, simply rounded, with apical margin longer setose. Tergite VIII with posterior margin evenly rounded.

Aedeagus ( Figs 121, 122 ); apical portion of tegmen 1.9 times as long as basal-piece, wide, of rather complex morphology subapically, with bluntly pointed apex; median lobe of aedeagus terminating in a pair of wide, conspicuous lobes, its basal apodeme distinctly widened.

Female. Unknown.

Body length (♂ ♀). 3.9–4.2 mm (holotype 3.9 mm).

Variation. The paratype specimen from AMSA differs slightly in the morphology of the metatibiae (angularly produced on the inner side apically) and male sternite VIII; the peculiar and rather complex structure of aedeagus is identical.

Type material. Holotype: ♂, S.AUST. Gammon Ra NP Aroona Ck. 2km NE Owieandana OS pitfall 6 May 1989 J.A. Forrest // S.Aust. Museum specimen ( SAMA) . Paratypes: 3 ♂♂, same data as holotype ( SAMA) ; 1 ♂, Interior S. Australia [p+h] // Formicomus quadrimaculatus King Id. by A. M. Lea [p+h] ( AMSA) .

Differential diagnosis. C. gammon sp. nov. is probably close to C. campicola sp. nov., as is suggested by the nearly identical appearance and similarity of some male characters (wide tegmen, bilobed apex of median lobe of aedeagus). Externally they differ only slightly in body form, prominence of the dorsal punctation of the head (cf. Figs 118 , 72 ), and form of te subapical process of the metafemora (cf. Figs 119 , 73 ). On the other hand, they clearly differ in the detailed morphology of male sternite VIII, the tegmen, and the median lobe of the aedeagus (cf. Figs 120–122 and 74–76 ).

Etymology. Named after the type locality.

Distribution. Australia (South Australia).

Figures

FIGURES 112–122: Chileanthicus eyrensis sp. nov., male, holotype: 112, body form and punctation of head (top) and pronotum (bottom); 113, antenna; 114, metafemur; 115, apex of metatibia; 116, sternite VIII; 117, apex of aedeagus in ventral (left) and lateral (right) view; C. gammon sp. nov., male, holotype: 118, body form and punctation of head (top) and elytra (bottom); 119, metafemur; 120, sternite VIII; 121, apex of tegmen in ventral (left) and lateral (right) view; 122, apex of median lobe of aedeagus in ventral (left) and lateral (right) view. Scale (1.0 mm): A, 118, 112; B, 113, 114, 119; (0.2 mm): C, 116, 120; D, 115, 121, 122; E, 117.

FIGURES 72–80: Chileanthicus campicola sp. nov., male, holotype: 72, body form and punctation of head (top) and elytra (bottom); 73, metafemur; 74, sternite VIII; 75, apical portion of aedeagus in lateral view; 76, apical portion of tegmen (right) and median lobe (left) of aedeagus in ventral view; C. comes sp. nov., male, holotype: 77, body form and punctation of head (top) and elytra (bottom); 78, metafemur; 79, sternite VIII; 80, apical portion of aedeagus in ventral (right) and lateral (left) view. Scale (1.0 mm): A, 72, 77; B, 72, 78; (0.2 mm): C, 74; D, 79, 80; E, 75, 76.