Cylidrus abdominalis Klug, 1842

Burke, Alan & Zolnerowich, Gregory, 2017, A taxonomic revision of the subfamily Tillinae Leach sensu lato (Coleoptera, Cleridae) in the New World, ZooKeys 179, pp. 75-157 : 99-101

Cylidrus abdominalis Klug, 1842 Fig. 3A

Synonyms.

Cylidrus fasciatus var. spinolai Schenkling, Clerites II, 1910, p. 122.

Type locality.

Santa Catarina, Brazil. Type depository: Germany, Berlin, Museum für Naturkunde der Humboldt-Universität (ZMHB).

Distribution.

States of Espirito Santo, Mato Grosso do Sul, and Santa Catarina, Brazil.

Differential diagnosis.

Cylidrus abdominalis is most similar to Cylidrus fasciatus Laporte, a species inhabiting central and southern Africa. Gorham (1876) indicated that C. fasciatus was introduced to South America and eventually became adapted to this new habitat. The five Brazilian specimens of C. abdominalis examined here do not differ from C. fasciatus , a finding contrary to Gorham’s observations on elytral fasciae differences between these two entities. The fasciae observed in individuals examined under the name C. fasciatus display slight differences in shape, color, and pattern (Figs 3A, 5D). These fasciae can range from dark testaceous to almost albus, and can extend from the elytral suture to the epipleural fold, to only a pair of spots on the median region of the elytral disc. Specimens of C. abdominalis examined here are consistent with this variation. Remaining characters were not variable for material of both species.

Redescription.

Female. Form: Body elongate, slender, elytra subparallel. Color: Head, thorax, elytral fuscus; legs, mouthparts and abdomen testaceous; antennomeres 1-5 dark testaceous, antennomeres 6-11 fuscus. Each elytron with a median, transver sal, testaceous fascia, this fascia initiates at the elytral suture and does not reach the epipleural fold (Fig. 3A).

Head: Longer than wide; enlarged throughout its length; including eyes wider than pronotum; eyes small, taller than wide, not bulging laterally, finely faceted, feebly emarginate posteriorly; antennal notch located in front of eye emargination; frons not bi-impressed; clypeus crenulate posteriorly; gena carinate, encircling eyes; submentum rugose, somewhat shiny; gular sutures parallel, slightly marked; integument punctate, rugose, more strongly rugose below eyes punctations fine and shallow, clothed with fine, pale, short, recumbent setae; antennae composed of 11 antennomeres; first antennomere slender; second antennomere slightly shorter than first antennomere; third antennomer somewhat longer than second antennomere; fourth antennomere about the same length as second antennomere; fifth antennomere about the same length as fourth antennomere; sixth antennomere about the same length as fifth antennomeres; antennomeres 6-10 about the same length, clavate; eleventh antennomere slightly longer than tenth antennomere, elongate, robust, obtusely rounded (8G); terminal labial palpi subsecuriform, terminal maxillary palpi, slender, cylindrical.

Thorax: Lateral margins of pronotum parallel, sides very feebly narrowing apically, strongly compressed in behind anterior margin; surface shiny, rugose, clothed with some fine, short, pale, semierect setae and some long, pale erect setae, vestiture more abundant laterally; very finely, scarcely punctate, punctations small and shallow. Prosternum convex, wider than long, smooth, polished, very feebly punctate, punctations small and shallow. Mesoventrite as long as wide, concave; strongly rugose; slightly vested with fine, pale, semi-erect setae; scarcely punctate, punctations coarse and deep. Metaventrite strongly convex; surface finely rugose, inconspicuously vested with fine, pale, semirecumbent setae; longitudinal depression and metaventral process absent. Metepisternum exposed throughout its length. Scutellum ovoid, compressed medially, glabrous.

Elytra: Slightly broader than pronotum; sinuate in lateral view; somewhat elongate; humeri feebly indicated, rounded; sides parallel, broader at middle; disc flat above; surface shiny, smooth; apices subtriangular, dehiscent; elytral declivity gradual, integument clothed with fine, short, dark, semirecumbent setae interspersed with very few scattered, long, semierect setae; sculpturing consisting of fine and shallow punctations irregularly arranged throughout elytral length; punctations at elytral base absent; epipleural fold narrow, gradually reducing toward distal end, absent on posterior fourth. Last two abdominal segments fully visible in dorsal view.

Legs: Femora shiny, smooth; slightly punctate; swollen; compressed laterally; clothed with some pale, fine, semirecumbent and semi-erect setae uniformly located throughout femoral integument. Tibiae somewhat slender; slightly broadening toward distal end; rather punctate; longitudinally rugose; vestiture consisting of pale, semirecumbent setae intermixed with some semierect setae.

Abdomen: Six visible ventrites. First visible ventrite longer than second visible ventrite. Ventrites 1-4 subquadrate, shiny, smooth, convex, finely punctate, clothed with fine, long, pale, recumbent setae; posterior margins truncate. Fifth visible ventrite subquadrate; integument convex, shiny, smooth; weakly clothed with fine, long, re cumbent setae; lateral margins parallel; posterior margin broadly, shallowly, V-shaped emarginate. Sixth visible ventrite subquadrate, smooth, shiny, convex, almost flat; inconspicuously punctate; clothed with some erect and semierect, long, piceous setae; vestiture more abundant on anterolateral margins; lateral margins feebly oblique; posterior margin broadly rounded to almost truncate. Fifth tergite subquadrate; surface concave, rugulose, glabrous, punctate; lateral margins subparallel; posterior margin truncate. Sixth tergite subquadrate, slightly rugulose, longer than wide; posterolateral margins conspicuously vested with long and short erect setae; posterior margin more strongly vested; integument moderately, minutely punctate; lateral margins slightly oblique; posterior margin slightly rounded to almost truncate. Sixth tergite extending slightly beyond apical margin of sixth visible ventrite, fully covering sixth ventrite in dorsal view.

Aedeagus: Not available.

Sexual dimorphism: No males were available for examination.

Material examined.

1 female: Espirito Santo, [Brazil], Schmidt, 100 m, 1905; 2 females: Mato Grosso do Sul, Brasil, Selvíria, UNESP Farm, ex Hevea brasiliensis bole, VII-10-1990, S. R. Rodrigues; 1 female: Nova Teutonia, Santa Catarina, Brazil, VIII-7-1944, F. Plaumann; 1 female: Brazil, Nova Teutonia, IX-1973, F. Plaumann.

Remarks.

Cylidrus Latreille is composed of 19 species and seven subspecies distributed in the tropical regions of Africa and Oceania ( Corporaal 1950). Gorham (1876) indicated that Cylidrus abdominalis is most similar to the African C. fasciatus and was probably transported from the Old World and became established in Brazil. Cylidrus abdominalis is here redescribed from material collected in the southeastern Brazilian provinces of Espirito Santo, Mato Grosso do Sul and Santa Catarina. Irrespective of its origin, whether a natural occurrence or an introduced species, the material examined here confirms the existence of this genus in the New World.