Hylotribus fluminensis Queiroz & Mermudes

Queiroz, Fernando Luiz Cunha Avila Villar De & Mermudes, José Ricardo M., 2014, Six new species of Hylotribus Jekel, 1860 from Brazil (Coleoptera, Anthribidae, Anthribinae, Discotenini), Zootaxa 3814 (2), pp. 242-258 : 243-245

Hylotribus fluminensis Queiroz & Mermudes sp. nov.

( Figs. 1–2 ; 13–23)

Male. Integument brown to black. Dorsal vestiture ( Figs. 1–2 ) yellowish-white, moderately dense. Frons with narrow light strip on each side of inner margin of eyes, clothed with dense, suberect yellowish pilosity, blackishbrown posteriorly. Antennae with some sparse, elongate setae and white pilosity, slightly denser at apex of segments II–VIII; club with short, sparse, blackish-brown pilosity, and white elongate setae. Vestiture of venter and legs yellowish-white, moderately sparse. Pronotum with four black, narrow vittae: two anterior, oblique, other two posterior, joined in middle; with three tubercles tufted by blackish-brown, erect setae. Scutellar shield with elongate, suberect, sparse brownish setae, anteriorly oriented. Elytra with interstria 1 at the middle two-thirds with yellowish pilosity intermingled with blackish-brown spots; other spots median on interstria 3 and 5 before white tuft of pilosity; interstriae 2–4 with white to yellowish-white pilosity, after basal tubercles; two tufts of white pilosity on interstria 5 and one on 7; humeri with tuft on top of tubercles; basal gibbosities and three pairs of anteapical tubercles with tuft of blackish-brown pilosity; before apical declivity with narrow, black and transverse vitta between ante-apical tubercles. Femora with transverse, black, wide postmedian strip. Tibiae with two narrow, light strips; apical third with blackish-brown setae.

Head almost twice as wide as width of rostrum at base. Frons trapezoidal. Eyes sub-oval, anterior margin slightly oblique. Head and rostrum strongly punctate-corrugate. Rostrum elongate, at least twice as long as head; distinctly widest at apex, and slightly depressed at scrobes; dorsum with distinct longitudinal median carina, extending from level of scrobes to base of rostrum; apical margin widely angulate. Scrobes apical and foveiform, elongate and narrowed, open ventrally; dorsal margin cariniform. Distance between scrobe and eye at least three times longer than eye diameter. Rostrum with ventral region longitudinally carinate, weakly depressed, with punctures more evident. Mentum with deep depression near apical margin. Antennae reaching posterior half of prothorax. Antennal segment II longer than scape, strongly thickened at apex; III the longest segment, almost 2x longer than II; IV one third shorter than III; V–VII decreasing in length; VIII the shortest segment, one third shorter than VII. Club distinct, with segments thick and short; IX weakly longer than wide; strongly wide at apex; X wider than long; XI as wide as long, distinctly wide basally, apical half rounded.

Pronotum as long as wide, widest at middle; sides convergent from middle. Pronotum corrugate, slightly convex, with three well developed tubercles. Antebasal carina 3-fragmented at each side: central section more posterior; lateral sections conspicuously prominent. Lateral carina lacking but with integument strongly elevated before lateral prominence. Prosternum subplanar with coarse, dense punctures. Anterior coxae subcontiguous. Mesosternal process narrow, smaller than half width mesocoxae cavity, flattened, with sides converging to apex, apex truncate. Metasternum transverse, with shallow groove at anterior margin. Scutellar shield subcircular. Elytra with humeral callus projected; basal margin conspicuously swollen around scutellar shield; basal tubercles well developed, formed by interstriae 1–4, swollen, inner side of tubercle flattened; stria 1 with dense, deep punctures clearly defining interstria 1; apical third of each elytron tri-tuberculate; ante-apical tubercles on interstriae 2–4; other smaller tubercle laterally at interstriae 6–8; and other more posterior at interstriae 4–6.

Ventrites narrow, I–IV subequal in length; surface punctate-corrugate. Ventrite V at least one third longer than IV, disk distinctly depressed, slightly swollen on each side; apical margin subtruncate. Pygidium as long as wide, sides distinctly convergent, apex rounded-truncate.

Terminalia. Tergite VIII ( Fig. 13 ) largely membranous at middle, sides slightly convergent to apex, apex subtruncate. Sternite VIII ( Fig. 14 ) strongly transverse, membranous, four times wider than long, lateral lobes distinct, weakly pigmented, apodeme short, subtriangular. Sternite IX ( Fig. 15 ) with apodeme three times as long as arms, acuminate at apex. Tegmen ( Fig. 16–17 ) with apodeme about as long as sclerotized ring, emarginate before apex; parameres fused, slightly wider at base, truncate at apex. Penis ( Figs. 18–19 ) elongate, slightly curved, body about three times shorter than apodemes; with bridge between apodemes; tectum ( Fig. 18 ) 1/4 longer than wide, somewhat convex ( Fig. 19 ), slightly acuminate before apical third, with convergent sides at apex ( Fig. 18 ); pedon ( Fig. 19 ) slightly curved; apodemes barely straight. Internal sac ( Fig. 19 ) slightly shorter than apodemes, spiculate, distinctly denser medially; lacking sclerotized pieces.

Female. Ventrite V not depressed. Terminalia. Tergite VIII ( Fig. 20 ) damaged, slightly longer than wide, largely membranous at middle, slightly sclerotized at margins, sides subparallel, subtruncate at apex. Sternite VIII ( Fig. 20 ) at least two times wider than long, convergent to apex, apical margin convex; apodeme three times longer than sternite. Ovipositor ( Figs. 21–23 ) with body distinct from lateral rods; median rod short, half as long as ovipositor; medial ventral lobe bilobate; toothed plate with four teeth: three strongly acuminate; two dorsal and distal partially fused and one ventral; forth tooth more proximal and ventral, rounded; stylus inserted medially at toothed plate.

Measurements, in mm, male/female: TL: 4.2–6.2/ 3.4–4.8; RL: 1.2–2.3/ 1.1–1.8; RAW: 0.6–0.9/0.5–0.8; RBW: 0.4–0.6/0.3–0.6; PL: 1.3–2.1/1.0–1.6; PW: 1.6–2.6/1.4–2.1; EL: 2.9–4.2/2.4–3.2; EW: 1.9–3.0/ 1.6–2.5.

Type material. HOLOTYPE male from BRAZIL, Rio de Janeiro: Rio de Janeiro (Corcovado), 18.X.1970, Alvarenga & Seabra col. ( MNRJ). Paratypes: same data: 1 F, IV.1958, 1 F, V.1958 (dissected), 1 F, VIII.1958, 1 M, VI.1959, 1 F, X.1959 ( MNRJ), 2 M, X.1965, ( USNM), 1 M, 1 F, X.1966, 1 M, 1 F, X.1967, 2 F, X.1968, 1 F, 18.X.1971, 1 M, 17.X.1975 (dissected), 1 F, 9.X.1975, 1 F, 19.X.1976, Monné & Seabra col. ( MNRJ), 1 M 10.XII.1988, ex. Coll. Clovis Beduin, 1 F, 1 M, IX.1966, 2 F, X. 1967, 1 F. III.1968, 1 M, 17.X.1975 Alvarenga & Seabra col. ( DZRJ), 1 F, XI.1961, same col. ( USNM); (Guanabara), 1 M, X.1963, Alvarenga col. ( USNM); Angra dos Reis ( Ilha Grande, Praia da Parnaioca), 1 F, 09.II.2012 Mermudes et al. col.(dissected) ( DZRJ).

Etymology. The name fluminensis refers to someone born in the state of Rio de Janeiro, Brazil.

Remarks. Hylotribus fluminensis ( Figs. 1–2 ) differs from other species of the genus mainly by the vestiture pattern of pronotum and elytra; arrangement of elytral tubercles; pronotum with four black and narrow vittae, with three tubercles tufted at the top by blackish-brown, erect setae; elytra with conspicuous vestiture described above, and with humeral callus projected, basal tubercles very developed, formed by interstriae 1–4 swollen, inner side of tubercle flattened. The apical third of each elytron is tri-tuberculate; ante-apical tubercles on interstriae 2–4; other smaller tubercle, laterally on interstriae 6–8; and other more posterior on interstriae 4–6.

Figures

FIGURES 1 – 2. Hylotribus fluminensis Queiroz & Mermudes sp. nov., holotype male: 1, dorsal; 2, lateral.

FIGURES 13 – 19. Hylotribus fluminensis Queiroz & Mermudes sp. nov.: 13, tergite VIII; 14 sternite VIII; 15, sternite IX; 16 – 17, tegmen, 16 dorsal, 17, lateral; 18 – 19, aedeagus, 18, dorsal with tectum detail, 19, dorsolateral, with pedon and internal sac details.

FIGURES 20 – 23. Hylotribus fluminensis Queiroz & Mermudes sp. nov.: 20 – 23, female terminalia: 20, tergite and sternite VIII; 21 – 23, ovipositor; 21, dorsal; 22, lateral; 23, ventral.