Hybochaetodus disruptus Ocampo

Ocampo, Federico C., 2006, Two new species of Hybochaetodus Arrow (Coleoptera: Scarabaeoidea: Hybosoridae: Anaidinae) from Peru, Zootaxa 1304, pp. 49-59 : 52-54

Hybochaetodus disruptus Ocampo , sp. nov.

( Figs. 1, 2)

Type material. Holotype female at MUSM labeled: “ PERU: DEPTO CUZCO / Región Camisea, 14.VIII.1998. / Camp. Wayrapata 2445 msnm. / leg. Gorky Valencia”; “Plot 0 5. Elfin Forest / 12°50’10.1” S. – 73°29’42.6” W. / Pipe Line Kimbiri / Bait Trap with Rotting Fish”; “ Hybochaetodus disruptus / HOLOTYPE / F. C. Ocampo” (my red holotype label, handwritten). One female paratype at VMDC labeled as holotype except: “ Hybochaetodus disruptus / PARATYPE / F. C. Ocampo” (my yellow paratype label, handwritten).

Description. Holotype female ( Figs 1, 2). Length 6.7 mm; width 3.5 mm. Color: reddish­black. Head: Frons in dorsal view nearly flat; surface punctate; punctures moderately dense, size moderate. Frontoclypeal suture obsolete. Clypeal shape subtrapezoidal, apex 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 antennomeres. Pronotum ( Figs. 1, 2): Surface convex, 0.68 times as long as wide; surface mostly rugose; punctate on center of disc; punctures moderately dense, large. Base with concave area in middle. Anterior margin with weak bead; lateral margins arcuate, denticulate; posterior margin sinuous. Anterior angles acute; posterior angles nearly rightangled. Scutellum: Shape triangular, surface moderately setose, apex acute, visible area small. Elytron ( Figs. 1, 2): Globose, apex rounded; surface with 12 fine striae; interval surface with v­shaped sculpture; intervals 1, 4, 7, 10, and 12 carinate; carinae discontinous, extended from base to declivous area. Lateral margin denticulate, border not reflexed. Epipleuron shagreened, wider at base, tapered toward apex. 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. 1, 2): 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, setae sparse; 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. Meso­ and metatibial medial spur subequal in length, spurs acuminate.

Variation. The only paratype does not differ significantly from the holotype except slightly in size, being 0.1 mm longer.

Diagnosis. This species is distinguished from the other species of Hybochaetodus by the posterior margin of the pronotum being sinuous; the presence of five discontinuous elytral carinae; and the globose shape of the elytra ( Figs. 1, 2). Male unknown.

Type Locality. Peru, Cusco, Región Camisea, Camp Wayrapata.

Etymology. From the Latin ‘ disruptus ’, meaning ‘broken up’, in reference to the discontinuous elytral carinae of this species.

Remarks. The two known specimens of H. disruptus were collected with a pit fall trap baited with rotting fish. Label data indicate that the specimens were found in elfin forest at 2445 m elevation. Hybochaetodus disruptus is known only from the type locality. Specimens of H. disruptus were collected during a Rapid Assessment Program conducted by scientists from Peru and the USA. Results and details of this project were published by Alonso et al. (2001).