Pycnotarsobrentus Maruyama & Bartolozzi, 2014

Maruyama, Munetoshi, Bartolozzi, Luca, Inui, Yoko, Tanaka, Hiroshi O., Hyodo, Fujio, Shimizu-Kaya, Usun, Takematsu, Yoko, Hishi, Takuo & Itioka, Takao, 2014, A new genus and species of myrmecophilous brentid beetle (Coleoptera: Brentidae) inhabiting the myrmecophytic epiphytes in the Bornean rainforest canopy, Zootaxa 3786 (1), pp. 73-78 : 74

Pycnotarsobrentus Maruyama & Bartolozzi , gen. nov.

Type species. Pycnotarsobrentus inuiae Maruyama & Bartolozzi , sp. nov., by present designation.

Description. Male. Body ( Figs. 1, 2 ) rather short, stout.

Head ( Fig. 3 ) short, twice as wide as long, slightly convex above; eyes large, strongly prominent and hemispherical, occupying almost entire side of head, their posterior margins contiguous with basal constriction; antennae ( Fig. 3 ) 11-segmented, short, thick, cylindrical, slightly widened apically, almost symmetrical, apical segment rounded distally, not pointed; rostrum longer than wide, not separated from head by any depression, tubercle or carina; metarostrum short, margined laterally, concave at sides; mesorostrum roundly convex at sides, slightly depressed dorsally, without medial carina; prorostrum much narrower than mesorostrum, slightly depressed at sides, margined laterally, concave at sides, truncate at apex; mandibles short; rostral apophyses slightly expanded laterad; underside of pro- and mesorostrum flattened, dilated apicad.

Pronotum ( Fig. 1 ) longer than wide, strongly punctured at sides, slightly on disc, with trace of median sulcus basally.

Elytra ( Fig. 1 ) slightly wider than pronotum, parallel-sided in basal half, narrowed toward apex, slightly flattened and expanded at apex, striae narrow, interstriae wider; underside of apical expansions with trichomes along border.

Legs ( Figs. 1, 2 ) robust, femora laterally compressed from base to middle; tibiae ( Fig. 4 ) laterally compressed with weak swelling in middle, serrate on inner margin; hind and mid tibiae with inner margin tooth-shaped at apex; minute tibial spurs 1-2-2; tarsi short, thick, compressed, parallel-sided; tarsal segment III with pair of longitudinal adhesive patches of pubescence; tarsal segment IV shorter than III.

Prosternum linear between coxae. Metasternum with medial longitudinal groove. Sternites III-IV with large medial circular depression; sternite VII slightly emarginate at apex.

Female. Body ( Figs. 5–6 ) similar to male. Antennae ( Fig. 7 ) slightly longer than in male; mesorostrum slightly shorter, less expanded laterad; prorostrum short, cylindrical, slightly narrowed towards apex. Mid and hind tibiae ( Figs. 5–6 ) without inner apical tooth-like expansion. Metaventrite slightly depressed around middle. Sternites III- IV completely fused, without medial depression.

Differential diagnosis. This genus is close to the African genus Pericordus Kolbe, 1883 , in the head and rostrum lacking depression or carinae, short antennae, laterally compressed femora and tibiae, and rather thick and short tarsi, but clearly distinguished from it by the antennal segments being cylindrical, rugose and rather compressed, with the apical segment rounded at apex, by the mesorostrum being not convex, by the tarsi being shorter, with parallel-sided segments and extremely short tarsal segment IV.

Etymology. The generic name is derived from Greek words meaning “stout tarsi-bearing brentid” for one its important character states: the thick, short tarsi. Gender masculine.

Figures

FIGURES 1–7. Pycnotarsobrentus inuiae gen. nov. and sp. nov. 1—Male habitus, dorsal view (paratype; color became paler during preserving in ethanol), 2—same individual, ventral view, 3—ditto, head, dorsal view, 4—right fore tibia and tarsus, 5— female habitus, dorsal view (paratype), 6—same individual, ventral view, 7—ditto, head, dorsal view.