Hybochaetodus erugocarinatus Ocampo

Ocampo, Federico C., 2006, Two new species of Hybochaetodus Arrow (Coleoptera: Scarabaeoidea: Hybosoridae: Anaidinae) from Peru, Zootaxa 1304, pp. 49-59 : 54-57

Hybochaetodus erugocarinatus Ocampo sp. nov.

( Figs. 3–6 )

Type material. Holotype male at MUSM labeled: “ PERU: DEPTO. CUSCO / Distrito Kosñipata, 18.01.2000 / Km. 6 Trocha Union, 2700 msnm. / leg. Gorky Valencia”; “Plot oo. (Upper Manu) / 13°03’ S. – 71°17’ W. / Elfin Forest / Bait Trap with Rotting Fish”; “ Hybochaetodus erugocarinatus / HOLOTYPE / F. C. Ocampo” (my red holotype label, handwritten). Allotype female at MUSM labeled as holotype except: “ Hybochaetodus erugocarinatus / ALLOTYPE / F. C. Ocampo” (my red allotype label, handwritten). One male paratype at FCOC, one male paratype at VMDC, and one paratype at UNSM labeled as holotype except: “ 16.01.2000 ” / “Bait Trap with Rotting Chicken”. One female paratype at VMDC labeled as last except: “Bait Trap with Rotting Papaya”. All paratypes with “ Hybochaetodus erugocarinatus / PARATYPE / F. C. Ocampo” (my yellow paratype label, handwritten).

Description. Holotype male ( Figs. 3–6 ). Length 10.0 mm; width 4.6 mm. Color: black. Head ( Figs. 3, 4 ): Frons in dorsal view nearly flat; surface punctate in middle, rugose on sides; punctures moderately dense, size moderate. Frontoclypeal suture obsolete. Clypeal shape subtrapezoidal, apex weakly rounded, surface rugose. Clypeal margins weakly reflexed, vertical surface of apex blunt. Labrum truncate, apex slightly indented; dorsal surface with fringe of setae; lateral margins rounded. Mandibles with external surface sculptured at base, sparsely setose; apex acute, slightly reflexed; scissorial area with small, preapical tooth. Labium with apex of mentum slightly indented, surface sparsely setose. Antennae with 10 antennomeres; antennomeres 2–7 moniliform; antennal club with 3 antennomeres; basal antennomere of club cupuliform, capable of receiving penultimate and ultimate segments. Pronotum ( Figs. 3, 4 ): Surface convex, 0.71 times as long as wide; surface punctate on disc, rugose on sides and base; punctures moderately dense. Base with deep, elongated fovea in middle. Anterior margin with weak bead; lateral margins arcuate, weakly denticulate; posterior margin sinuous, with distinctive medial projection. Anterior angles acute; posterior angles nearly right­angled. Scutellum: Shape triangular, surface moderately setose, apex acute, visible area small. Elytron ( Figs 3, 4 ): E longate, apex weakly acute; surface with 12 fine striae; interval surface with v­shaped sculpture; intervals 1, 4, 7, and 10 carinate; carinae smooth, extended from base to declivous area. Elytral lateral border reflexed; margin smooth, densely setose; setae short. Epipleuron wide, shagreened, equal in width from humeral angle to 2/3 length, apex tapered. Hind wing: Vestigial. Ve n t e r: Prosternal surface transversely strigulate; prosternal shield with posteriomedial process poorly developed. Meso­ and metasternal surface strigulate. Proepisternal surface strigulate. Abdominal sternites transversely strigulate. Legs ( Figs. 3, 4 ): Procoxal surface strigulate. Metatrochanter with posteriomedial tooth absent. Femoral surface vermiculate to strigulate, sparsely setose. Pro­, meso­, and metatibiae slender. Protibia with 3 teeth and small denticles on outer margin; basal and middle teeth subtriangular; dorsal surface with 2 setose, longitudinal carinae; protibial spur longer than apical tooth, curved at apex, apex acute. Pro­, meso­, and metatarsomeres 1 longer than 2; protarsomere 1 with small ventral tooth; tarsomeres 2–4 subequal in length; tarsomere 5 longer than 4. Pro­, meso­, and metatarsal claws shorter than tarsomeres 5, simple, curved. Meso­ and metatibial outer surface with 2 longitudinal rows of teeth, teeth small, 1 seta at base of each tooth. Mesotibial medial spur longer than external spur; metatibial spurs subequal in length; spurs with apex acuminate. Parameres: ( Figs. 5, 6 ).

Variation. The allotype and paratypes do not differ significantly from the holotype. Size variation ranges from 9.9–10.2 mm in length and 4.5–4.6 mm in width. Females are distinguished from males by the mesotibial spurs subequal in length.

Diagnosis. This species is distinguished from the other species of Hybochaetodus by the presence of four elytral carinae from base to declivous area, carinae smooth; elytral border reflexed; and the body shape elongated ( Figs. 3, 4 ). The shape of the male parameres is also diagnostic ( Figs. 5, 6 ).

Type locality. Peru, Cusco, Distrito Kosñipata, 6 km from Trocha Unión.

Etymology. From the Latin ‘ erugo ­’ meaning smooth, and ‘ carina ’, referring to the four smooth, elytral carinae of this species.

Remarks. The type series of H. erugocarinatus was collected with pit fall traps baited with either rotting fish, rotting chicken, or rotting papaya. Label data indicate that specimens were found in elfin forest at 2700 m elevation. Hybochaetodus erugocarinatus is known only from the type locality. Specimens of H. erugocarinatus were collected during a Rapid Assessment Program conducted by scientists from Peru and the USA. Results and details of this project were published by Vriesendorp et al. (2004).

Figures

FIGURES 3 – 4. Hybochaetodus erugocarinatus Ocampo sp. nov.

FIGURES 5 – 6. Male genitalia of Hybochaetodus erugocarinatus Ocampo sp. nov.