Onychotillus cubana De Zayas, 1988

Burke, Alan & Zolnerowich, Gregory, 2017, A taxonomic revision of the subfamily Tillinae Leach sensu lato (Coleoptera, Cleridae) in the New World, ZooKeys 719, pp. 75-157 : 137-141

Onychotillus cubana De Zayas, 1988 Figs 5A, 10E

Type material not examined.

Type locality.

Pico Turquino, Cuba. Type depository: unknown.

Distribution.

Cayman Islands*, Cuba, Dominican Republic*.

Differential diagnosis.

Onychotillus cubana can be differentiated from O. vittatus based on the integument color, structure of the eleventh antennomere, and body size. In O. cubana the pronotal integument is light testaceous to ferrugineous (Fig. 5A), the eleventh antennomere is approximately 4 × the length of the tenth antennomere (Fig. 10E), and body length ranges from 3 to 5 mm. Onychotillus vittatus , on the other side, has the pronotal integument metallic blue to almost piceous (Fig. 5B), the eleventh antennomere is about the same length as the tenth antennomere (Fig. 10F), and body length ranges from 6 to 11 mm.

Redescription.

Male. Form: Rather robust, short. Color: Head, antennae, mouthparts, elytra, legs, meso and metathorax light fuscous to almost piceous; pronotum and prosternum testaceous to ferrugineous; mesoventrite and abdomen, except anterior portion of first visible ventrite, testaceous; metaventrite and anterior portion of first visible ventrite light brown (Fig. 5A).

Head: Measured across eyes wider than pronotum; surface rugose; moderately, coarsely punctate; clothed with long, recumbent setae and some semierect setae behind the eyes; frons bi-impressed; eyes large, rounded, slightly taller than wide, bulging laterally; antennae extending slightly beyond base of elytra; second antennomere short, robust; third antennomere slightly longer than third antennomere; fourth antennomere about the same length as second antennomere; antennomeres 5-10 subequal in length, each about half the length of fourth antennomere; antennomere 2-4 subcylindrical; antennomeres 5-10 feebly serrate; last antennomere cylindrical, acuminate posteriorly, approximately 3.5 × the length of tenth antennomere (Fig. 10E).

Thorax: Pronotum short, as wide as long; sides constricted anteriorly and subapically; widest in front of middle; disc convex; anterior transverse depression and subbasal tumescence absent; surface clothed with short and long, semierect setae; surface rugulose to shiny, conspicuously less rugose than head; shallowly punctate. Prosternum rugulose to shiny; punctations absent to very feebly punctate. Mesoventrite convex; conspicuously, coarsely punctate; clothed with long, semirecumbent setae. Metaventrite wider than long; strongly concave; rugulose; shallowly punctate; vested with fine, pale, recumbent setae.

Legs: Femora and tibiae clothed with fine, semirecumbent setae interspersed with long, semierect setae; surface of femora rugulose to smooth. Tibiae transversally rugose; fourth tarsomeres with pulvilli not incised medially.

Elytra: Base wider than pronotum; humeri indicated; sides subparallel; widest behind middle; disc convex; surface rugose; apices subtriangular, feebly dehiscent; clothed with long and short, erect setae; sculpturing consisting of coarse punctations arranged in regular striae that gradually become smaller toward apex, striae reaching elytral apex; interstices at elytral base about 2.5 × the width of punctuation.

Abdomen: Six visible ventrites. First visible ventrite medially elevated; lateral portions feeble excavated; ventrites 1-4 slightly rugose, subquadrate, shallowly punctate; vested with long, fine, pale, recumbent setae. Fifth visible ventrite subquadrate; surface convex, coarsely punctate; lateral margins subparallel; posterior margin truncate. Sixth visible ventrite subquadrate; broader than long; surface rugulose; moderately, coarsely punctate; lateral margins conspicuously oblique; posterior margin broadly rounded, producing a semicircular margin. Fifth tergite rugulose; lateral margins subparallel; posterior margin truncate, with a narrow, shallow, subtriangular emargination. Sixth tergite subtriangular; broader than long; surface rugulose; lateral margins feebly arcuate, oblique; posterior margin short, rounded; lateral and poste rior angles producing a round posterolateral margin; Sixth tergite extending beyond posterior margin of sixth visible ventrite, fully covering the sixth visible ventrite in dorsal view.

Aedeagus: Not available.

Sexual dimorphism: The only female examined differs from males by having the last abdominal segment broadly rounded and inconspicuously convex to almost flat, rather than subtriangular in shape and with the surface convex, as seen in males. This female also has the eleventh antennomere approximately 0.5 × shorter than the same antennomere of males.

Material examined.

2 males, 1 female: Cayman Islands, Brac Paradise Subdivision, 19°44.688'N, 79°44.55'W, 6-VI-2008, M. C. Thomas, R. H. Turnbow and B. K. Dozier, blacklight trap; 1 female: Cayman Islands, Major Donald Dr., 4 km E jct. Ashton Reid Dr., 22-V-2009, M. C. Thomas, R. H. Turnbow; 1 male: Dominican Republic, Independencia, Sierra de Neiva, just south of crest, 5 km SW of Angel Feliz, 1780 m, 18°41'N, 71°47'W, 13-15-X-1991, J. Rawlings, R. Davidson, C. Young and S. Thomas.