Cyclocaccus epakros 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 epakros Hisamatsu , new species ( Figs. 1L , 9 , Map 3)

Type Series. Holotype ( SEMC): ♂, ‘ MEXICO: Guerrero / ca. 78 km NE Atoyac de / Alvarez , 27. VII. 1992 / 1960–2120 m, J. S. Ashe / H. Frania #133. ex: leaf / litter/rotten wood’ . Paratypes: [ MEXICO] 2♂ 1♀, same data as the holotype ( SEMC) ; 2♀, 6.4 miles southwest, Guerrero, ca. alt. 9,000 ft., 8. VII. 1987, K. Schaffner leg. ( SEMC) ; 1♀, Cerro, Huitepec ( Pico ), ca. 5 km, W. San Cristobal, Chiapas, alt. 2,750 m, ex: cloud forest litter, 18. IX. 1991, R. Anderson leg. ( CMN) .

Etymology. The specific epithet is derived from the Greek word “epakros” meaning “pointed at the end,” a reference to the strongly acuminate apex of the tegmen in ventral view.

Diagnosis. This species differs from other congeners by the following combination of characters: pronotum and elytra different of colors; pronotum pale yellow, with dark brown longitudinal maculation at midline, possessing two vague lateral markings; antennal segment XI with one oval antennal sensilla; pro- and mesotarsal segments II and III of males moderately dilated; apical margin of tegmen strongly acute in ventral view; median lobe subparallel-sided in ventral view; apical margin of median lobe widely rounded; apex of short, thick gonocoxites deeply incised.

Similar Species. This new species is similar to C. maculatus in having one antennal sensilla and rather short and thick gonocoxites, but can be distinguished by the following combination of characters: abdominal tergite VII and legs fully reddish brown to chestnut brown; apical margin of tegmen strongly acute in ventral view. It is also similar to C. monticola , but can be distinguished by the following combination of characters: antennal segment XI with one oval antennal sensilla; apical margin of tegmen strongly acute in ventral view; gonocoxites short and thick.

Description. Length 1.63–2.21 (2.03) mm, width 1.30–1.72 (1.60) mm, depth 0.93–1.02 mm (0.97) (n = 5). Male. Body ( Fig. 1L ) oval; dorsum and venter strongly shining; strongly convex dorsally, moderately convex ventrally; dorsum and venter glabrous. Dorsal disc of head, antennal club (except paler apical area of segment XI), and scutellum dark brown; pronotum pale yellow, with dark brown longitudinal maculation at midline, usually with vague spot on each side of the longitudinal maculation; elytra, abdominal tergites, and venter reddish brown to chestnut brown; hypomera and elytral epipleura pale yellow. Head: Dorsal disc possessing sparse, minute punctures; interspaces reticulate. Labrum feebly notched at middle. Antenna ( Fig. 9C ) with club long and large, ACL/ASI-VIII = 0.82 (n = 1); antennal segment XI with an oval antennal sensilla; approximate ratio of each segment (n = 1) 3.23: 2.24: 2.29: 1.59: 1.72: 1.10: 1.00: 1.13: 4.00: 3.24: 4.44. Pronotum: 2.92–3.28 (3.10) times as wide as long (n = 5); disc possessing sparse, minute punctures; interspaces reticulate. Scutellum: Disc possessing few minute punctures; interspaces reticulate. Elytra: 0.97–1.03 (1.00) times as long as wide (n = 5), 3.45–4.02 (3.77) times as long as pronotum (n = 5), widest at middle; each elytron with 9 regular rows of punctures about as large as eye facet; interstices without punctures or with few minute punctures. Venter: Prosternum feebly convex along midline. Metaventrite strongly convex. Abdominal sternite III without subcoxal lines. Legs: Slender; pro- and mesotarsal segments II and III moderately dilated; tarsal claws simple. Genitalia: Tegmen ( Fig. 9A ) long, TL/TW = 2.18 (n = 1), constricted at midlength, then strongly convergent apically; apical and lateral margins of tegmen strongly undulating in ventral view; apical margin of tegmen strongly acute in ventral view; median lobe ( Fig. 9B ) long, in ventral view subparallel-sided; apical margin of median lobe widely rounded; sclerites of internal sac as in Fig. 9B . Female. Pro- and mesotarsal segments I–III more weakly dilated than those of males. Ovipositor ( Fig. 9D ) with deeply incised apices of short, thick gonocoxites.

Distribution. Mexico (Guerrero and Chiapas) (Map 3).

Figures

Fig. 1. Dorsal habitus of Cyclocaccus species in the C. laeticulus species-group. A) C. clinei, holotype, B) C. laeticulus, holotype, C) C. laeticulus, holotype, labels, D) C. laeticulus, Venezuela, E) C. speciosus, holotype, F) C. monticola, lectotype, G) C. monticola, lectotype, labels, H) C. monticola, Guatemala, I) C. monticola, Bolivia, J) C. costaricensis, holotype, K) C. maculatus, holotype, L) C. epakros, holotype. Scale bars = 1 mm.

Fig. 9. Cyclocaccus epakros, Guerrero, Mexico. A) Tegmen, ventral view, B) Median lobe, ventral view, C) Right antenna, ventral view, D) Ovipositor. Scale bars = 0.1 mm.