Cyclocaccus oenorubens Hisamatsu, 2016

Hisamatsu, Sadatomo, Bayless, Victoria M. & Carlton, Christopher E., 2016, Revision ofCyclocaccusSharp (Coleoptera: Nitidulidae: Nitidulinae), The Coleopterists Bulletin 70 (4), pp. 825-870 : 825-870

Cyclocaccus oenorubens Hisamatsu , new species

( Figs. 10C , 11I , 13 , Map 4)

Type Series. Holotype ( SEMC): ♂, ‘ GUYANA Region 8 / Iwokrama Forest, Pakatau hills / 4°44′ 54″N, 59°1′36″W, 70 m / 28 May 2001, R. Brooks, Z. Falin / GUY 1BF01 049 / ex: fogging fungus logs. // SM0412024 / KUKHM–ENT’ Paratypes: [ GUYANA] 1♀, same data as the holotype. ( SEMC) . [ BRAZIL] 1♀, Belem, Ipean, Pará, ex: flight intercept trap, I. 1985, N. Degallíer leg. ( SEMC) .

Etymology. The specific epithet of this new species is formed from the Latin “oen” (wine) + “rubens” (red), which is derived from the dark reddish body coloration of this new species.

Diagnosis. This species differs from other congeners by the following combination of characters: body dark reddish brown; subcoxal lines on abdominal sternite III present; pro- and mesotarsal segments II and III of males feebly dilated; TL/TW = 1.57 (n = 1); lateral margins of tegmen in ventral view subparallel-sided from base to basal half, then strongly convergent apically; apical margin of tegmen rounded in ventral view; median lobe in ventral view subparallel-sided from base to basal 4/5, then strongly converging anteriorly; apical margin of median lobe in ventral view subtruncate; apices of gonocoxites square, with apicolateral corners widely rounded.

Similar Species. This new species is similar to C. pantherinus in having similar body shape and sclerites of the internal sac, but can be distinguished by the following combination of characters: body fully dark reddish brown; elytral interstices more sparsely punctate; apical margin of median lobe subtruncate in ventral view. It is also similar to C. brevicollis , known from Panama and Costa Rica, but can be distinguished by the following combination of characters: body fully dark reddish brown; subcoxal lines on abdominal sternite III present; elytral interstices more sparsely punctate; apical margin of median lobe subtruncate in ventral view.

Description. Length 1.78–1.79 (1.78) mm, width 1.53 (1.53) mm, depth 0.88–0.90 (0.89) mm (n = 2). Male. Body ( Fig. 10C ) round; dorsal disc completely dark reddish brown; apical area of head, mouthparts, antennal segments I–VIII, scutellum, hypomera, metanepisternum, elytral epipleura, and tarsi paler; antennal club dark brown except paler at apex. Head: Dorsal disc densely punctate; interspaces smooth. Labrum feebly notched at middle. Antenna ( Fig. 13C ) with club long and large, ACL/ASI-VIII = 0.70; antennal segment XI with 2 oval antennal sensilla; approximate ratio of each segment (n = 1) is 3.44: 2.85: 2.43: 1.33: 1.35: 1.00: 1.05: 1.35: 2.64: 2.64: 5.11. Pronotum: 2.60–3.13 (2.86) times as wide as long (n = 2); disc densely punctate; interspaces smooth. Scutellum: Disc sparsely punctate; interspaces smooth. Elytra: 0.84–0.89 (0.87) times as long as wide (n = 2), 2.65–3.25 (2.95) times as long as pronotum (n = 2), widest at basal 1/3; each elytron with 9 regular rows of punctures about as large as eye facet; interstices with dense punctures. Venter: Prosternum feebly convex along midline. Metaventrite strongly convex. Abdominal sternite III ( Fig. 11I ) with subcoxal lines. Legs: Slender; pro- and mesotarsal segments I–III slightly dilated; tarsal claws simple. Genitalia: Tegmen ( Fig. 13A ) subparallel-sided at basal 1/2, then strongly convergent apically in ventral view; TL/TW = 1.57 (n = 1); apical margin of tegmen rounded in ventral view; median lobe ( Fig. 13B ) subparallel-sided at basal 4/5, then strongly converging anteriorly in ventral view; apical margin of median lobe subtruncate in ventral view; sclerites of internal sac as in Fig. 13B .

Female. Pro- and mesotarsal segments I–III more weakly dilated than those of males. Ovipositor ( Fig. 13D ) with squared apices of gonocoxites; apicolateral corners of gonocoxites widely rounded.

Distribution. Guyana and Brazil (Map 4).

Figures

Fig. 10. Dorsal habitus of Cyclocaccus species in the C. brevicollis species-group. A) C. brevicollis, holotype, B) C. brevicollis, holotype, labels, C) C. oenorubens, holotype, D) C. pantherinus, holotype, Peru, E) C. pantherinus, Peru, F) C. pantherinus, Ecuador. Scale bars = 1 mm.

Fig. 11. Diagnostic characters of the C. brevicollis species-group. Cyclocaccus brevicollis: A) Ventral habitus, B) Head, dorsal view, C) Head, ventral view, D) Labrum; E) Mentum and labium, ventral view, F) Right maxilla, dorsal view, G) Right mandible, dorsal view, H) Scutellum. Cyclocaccus oenorubens, Brazil: I) Abdominal sternites. Cyclocaccus brevicollis: J) Male abdominal tergite VII, K) Male abdominal sternite VII, L) Metendosternite, dorsal view, M) Male protibia and protarsus, dorsal view, N) Male mesotibia and mesotarsus, dorsal view, O) Male metatibia and metatarsus, dorsal view, P) Male abdominal tergite VIII and spiculum gastrale, ventral view, Q) Left metanepisternum. Scale bars: A = 1 mm; B–C, I–K, Q = 0.5 mm; D–H, L–P = 0.1 mm.

Fig. 13. Cyclocaccus oenorubens, Guyana. A) Tegmen, ventral view, B) Median lobe, ventral view, C) Right antenna, ventral view, D) Ovipositor. Scale bars = 0.1 mm.