Stenocyphus bituberosus (Gyllenhal, 1833)

Guadalupe del Rio, M. & Lanteri, Analia A., 2013, Taxonomic revision of the genus Stenocyphus Marshall (Coleoptera, Curculionidae) from Brazil, ZooKeys 357, pp. 29-43 : 32-34

Stenocyphus bituberosus (Gyllenhal, 1833) Figs 1, 4, 8, 11, 14, 17, 20, 23-24

Cyphus bituberosus Gyllenhal in Schoenherr 1833: 622.

Neocyphus bituberosus : Bedel 1883: 23.

Stenocyphus bituberosus : Marshall 1922: 184.

Diagnosis.

Stenocyphus bituberosus is easily distinguished by the presence of one pair of large conical tubercles, slightly directed backwards, on posterior 2/3 of elytral interval 5, near declivity. This species differs from Stenocyphus sextuberosus in the following characters: body larger, scape of antennae slightly shorter, elytra with a single pair instead of three pairs of tubercles, intercoxal portion of abdomen slightly broader than cavity of metacoxae, spermatheca slender and aedeagus not flattened towards apex in lateral view.

Redescription.

LB: female (Figs 1, 4) 12.7-15.6 mm long; male 11.2-12.7 mm long (LS: female 10.1-12.2 mm; male 8.5-9.8 mm).

Vestiture uniformly whitish or tan.

Rostrum (Fig. 7) (LR/WR: 0.98-1.15) with sides slightly convergent toward apex (WF/WR: 1.23-1.45); preocular impression slight; prementum subcordiform.

Antennae (Fig. 8) (LB/LA: 2.49-3.00) with scape slightly exceeding posterior margin of eyes; funicular article 2, 1.50 –1.79× as long as article 1; club oval (LC/WC: 2.14-2.37).

Pronotum (Figs 1, 4) (WP/LP: 1.19-1.32) longitudinally impressed on disc and flanks; hind margin moderately bisinuate.

Scutellar shield subtriangular, covered with cream colored, lanceolate scales.

Elytra (Figs 1, 4) slender (LE/WE: 1.54-1.77; LE/LP: 2.67-3.00), with a pair of conical tubercles directed backwards, on posterior 2/3 of interval 5 near declivity; humeri slightly prominent; disc flat, slightly elevated towards declivity; punctures of striae deep; intervals slightly wavy (with undulating transverse impressions).

Legs. Protibiae slender, setose, with distinct mucro and 6-8 small denticles on inner face; mesotibiae with minute mucro and without denticles; metatibiae without mucro or denticles; corbels broad, covered with cream colored scales; apical comb almost 2 × as long as dorsal comb.

Abdomen (Fig. 11). Intercoxal portion about 1.75 × as wide as cavities of metacoxae.

Female genitalia. Sternite VIII (Fig. 14) with plate 2.13 × as long as apodeme. Ovipositor (Fig. 17) without setae along sides of subparallel baculi; styli slightly visible from ventral view. Spermatheca (Fig. 20) with subcylindrical, slender body, short nodulus, curved towards opening of gland, indistinct ramus and moderately long cornu (reaching opening of gland); spermathecal duct as long as half length of ovipositor; spermathecal gland 2 × as long as spermatheca.

Male genitalia. Penis (Figs 23-24) about 1.45 × as long as temones. Endophallus with two lateral long sclerites and a flagellum.

Material examined.

Type material. Lectotype of Cyphus bituberosus female, pinned, from Brazil, NHRS, labeled as type. Here designated to fix the concept of Cyphus bituberosus and to ensure the universal and consistent interpretation of the same.

Other material. BRAZIL. No loc: (1♀ USNM, 1♂ MNRJ), col. Bovie thru Buchanan (1♂ USNM), Deyr (2♀♀, 1♂ MCZ), Gorham (1♀ MCZ), Bowdetch (1♂ MCZ), Bruch (1♀ MLP), Pascoe (1♀ BMNH), Schoenherr coll (3♀♀ 1♂ NHRS). São Paulo: Embú, 5-III-1972, Lane col. (1♂ MZSP). Rio de Janeiro: no loc., 1905, Fry coll (1♂ BMNH). Espirito Santo: no loc. (2♀♀ AMNH).

Distribution.

Brazil, states of São Paulo, Rio de Janeiro and Espirito Santo.

Infraspecific variation.

Variation in Stenocyphus bituberosus is mainly related to body size, morphometrics and extent of development of the elytral tubercles.