Trestoncideres santossilvai Nearns and Tavakilian

Nearns, Eugenio H. & Tavakilian, Gérard-Luc, 2012, New Taxa and Combinations in Onciderini Thomson, 1860 (Coleoptera: Cerambycidae: Lamiinae) from Central and South America, with notes on additional taxa Eugenio H. Nearns, Insecta Mundi 2012 (231), pp. 1-24 : 15-17

Trestoncideres santossilvai Nearns and Tavakilian , sp. nov.

( Figures 6a–d )

Description. Male. Length 12.0–13.0 mm (measured from vertex to elytral apices), width 3.5–4.0 mm (measured across humeri). Habitus as in Fig. 6a . General form elongate-oblong, small to moderatesized. Integument generally dark brown or black, with whitish, gold, and ochraceous pubescence; mesepisternum, mesepimeron, metepisternum with dark brown and gold pubescence; metasternum with distinct vitta formed by dense, white pubescence, about as wide as metepisternum, not reaching margin with metepisternum ( Fig. 6b ); lateral margin of metasternum with dark brown and gold pubescence; remaining portions of venter and femora with whitish pubescence; apical 1/3 of elytra slightly darker than basal 2/3.

Head with frons roughly subquadrate, slightly transverse, about 3 times width of lower eye lobe (as in Fig. 6c ). Eyes with lower lobes moderate-sized, ovate; narrowest area connecting upper and lower eye lobes about 2-3 ommatidia wide. Genae elongate, about as tall as lower eye lobes. Antennae about 1.25 times longer than body; antennal tubercles prominent, widely separated; tubercles armed at apex with short blunt horn; scape robust, clavate; antennomere III curved, slightly sinuate. Antennal formula based on antennomere III: scape=0.85; II=0.29; III=1; IV=0.76; V=0.72; VI=0.65; VII=0.63; VIII=0.5; IX=0.53; X=0.47; XI=0.48.

Pronotum roughly subcylindrical, slightly narrower at base, transverse, about 1.4 times as wide as long, sides irregular, with a small, acute protuberance each side behind middle ( Fig. 6d ); disk with median, oval, glabrous region at basal half.

Scutellum transverse, apex rounded; outer margins fringed with whitish pubescence, central 1/2 glabrous.

Elytra about 2 times as long as width at humeri ( Fig. 6a ), about 3.3 times as long as pronotal length, about 1.25 times broader basally than pronotum at widest (at base); lateral margins nearly straight, gradually rounded to apices at apical 1/3, apices jointly rounded; base of each elytron with a feeble gibbosity; basal 1/3 of elytra with moderate to dense punctation, surface granulate-punctate; humeri slightly prominent, anterior margin arcuate, angle with small, obtuse tubercle.

Venter with procoxae large, globose, not uncate; narrowest area of prosternal process between procoxae about 1/4 as wide as procoxal cavity; apex of prosternal process subtriangular. Mesosternal process about 1/3 as wide as mesocoxal cavity; mesosternal process subtruncate. Fifth sternite about 1.5 times as long as IV, apex feebly emarginate.

Legs short in length; pro- and mesofemora robust; metafemora clavate apically; tibiae expanded apically; metafemora about 1/4 as long as elytra.

Female. Length 12.0–14.0 mm (measured from vertex to elytral apices), width 4.0– 4.5 mm (measured across humeri). Similar to male except antennae shorter, surpassing elytral apex at antennomere X; fifth sternite about 3 times as long as IV, with a median triangular impression.

Type Material. Holotype, male ( Fig. 6a, c–d ), “ Piste de Belizon , pk 24, 19 septembre 1992, Guyane, piégeage lumineux, Michel Duranton leg.” ( MNHN) . Allotype, female ( Fig. 6b ), “ Brazil: Amazonas , Rio Taruma Mirim, 20 km nw Manaus, 02Mar1979, 02º53’S 060º07’W; Black water inundation forest canopy fogged with Pyrethrum sample #44; Montgomery, Irwin, Schimmel, Krischik, Date, Bacon colls.”

( USNM). Nine paratypes: one male, “ Montsinery FRG Guyane, 24 Juillet 1985, Piégeage lumineux, P. Souka leg., 0489” ( MNHN); one male, “Risque-tout ( FRG pk19), 7 Mai 1983, Piégeage lumineux, P. Sarry leg., 0489” ( MNHN); one female, “ Route de Kaw pk 38, 13 Janvier 1986, Guyane, Piégeage lumineux, P. Gerdelat leg., 0489” ( ENPC); one female, “Piste Risquetout pk 16, 28 Juin 1987, Guyane, Piégeage lumineux, Marc Thouvenot leg.” ( MNHN); one female, “ Kaw PK 37, 20-VII-2001, PL ” ( DFPC); one male, “ Guyane, 12/V/1991 lumière route de Kaw PK 47, J-L Giuglaris leg.” ( PHDC); one male, “ Guyane, 06/III/1997 lumière RD06 PK19 J-L Giuglaris leg.” ( JLGC); one male, “ Guyane, 21/VII/1990 lumière Cacao J-L Giuglaris leg.” ( JLGC); one female, “ Guyane, 15/II/2006 lumière RD06 PK38 J-L Giuglaris leg.” ( JLGC) .

Etymology. We take pleasure in naming this species in honor of Antonio Santos-Silva, for his friendship, collaboration, and many contributions to the study of Neotropical Cerambycidae and Disteniidae . The epithet is a noun in the genitive case.

Diagnosis and Remarks. This species is distinguished from its congeners by the combination of the following characters: antennae, pronotum, and elytra with whitish and gold pubescence; pronotum with a small, acute protuberance each side behind middle; scutellum glabrous except for outer margins, which are fringed with whitish pubescence; and apical 1/3 of elytra slightly darker than basal 2/3. In addition, T. santossilvai can be distinguished from its congeners by the lateral margins of the metasterna not with dense white pubescence (in T. albiventris and T. laterialba , the dense white pubescence extends to the lateral margins of the metasterna, contiguous with metepisterna); outermost margin of metepisternum with dark brown and gold pubescence. Trestoncideres santossilvai , sp. nov. is described from 11 specimens: six males and five females. Nothing is known about the habitat and behavior of this species; however, all specimens from French Guiana were collected at light and the specimen from Brazil was collected by canopy fogging with pyrethrum.

Figures

Figure 6. Trestoncideres santossilvai, sp. nov. a) Holotype male, dorsal habitus. b) Allotype female, lateral habitus. c) Holotype male, close-up of head. d) Holotype male, close-up of pronotum.