Rosalba gaianii Joly, 2018

Santos-Silva, Antonio, Galileo, Maria Helena M., Joly, Luis J. & Tavakilian, Gérard L., 2018, The genus Rosalba Thomson, 1864 (Coleoptera, Cerambycidae, Lamiinae, Apomecynini), Zootaxa 4387 (2), pp. 201-258 : 230-231

Rosalba gaianii Joly , sp. nov.

( Figs 125–128 )

Description. Female. Integument mostly brown to dark brown; mouthparts light yellowish brown; antennae light brownish-orange, gradually lighter toward distal antennomeres, except black dorsal side of scape and extreme apex of antennomeres.

Head. Frons finely, sparsely punctate; with yellowish white pubescence not obscuring integument, denser close to eyes; with long, erect, sparse dark brown setae throughout. Area between antennal tubercles with punctures coarser than on frons; with yellowish white pubescence toward frons (not obscuring integument); with long, erect, sparse dark brown setae. Area between upper eye lobes with brownish-orange pubescence not obscuring integument (except on triangular area close to prothorax), also with brownish orange pubescence behind eyes, prolonged ventrally to apex of gena. Remaining surface of vertex and area behind upper eye lobes with conspicuous, sparse brownish-orange pubescence except two central spots on vertex, close to prothoracic margin, with denser pubescence obscuring integument; with few long erect, sparse dark brown setae close to eyes. Median longitudinal groove carinate on vertex. Area behind lower eye lobes with brownish-orange pubescence partially obscuring integument, except for central glabrous dark brown spot, interspersed with long, erect dark brown setae. Antennal tubercles minutely, moderately abundantly punctate; with yellowish white pubescence, more brownishorange toward upper eye lobes, not obscuring integument. Area between antennal socket and eyes with narrow, dense band of brownish orange pubescence, primarily on emarginate area of eyes. Submentum narrow, depressed close to gula, elevated toward mentum; with short, decumbent, moderately sparse yellowish white setae on depressed area. Postclypeus with yellowish white pubescence partially obscuring integument, with long, sparse, erect dark brown setae. Labrum convex and coplanar with anteclypeus on basal half, inclined on distal half; with a few yellow setae on coplanar area; with slightly conspicuous yellowish pubescence interspersed with long, erect, moderately abundant yellowish and dark brown setae on inclined area. Distance between upper eye lobes 0.11 times length of scape; in frontal view, distance between lower eye lobes 0.60 times length of scape. Antennae slightly longer than elytra, reaching elytral apex at base of antennomere IX; with decumbent, yellowish pubescence not obscuring integument; dorsal surface of scape with a few long, erect, sparse dark brown setae; antennomeres III–XI with short, erect, yellowish setae throughout; ventral surface of scape, pedicel and antennomeres III–X with long, erect dark brown setae (longer, more abundant on basal segments, gradually shorter, sparser toward X); antennal formula (ratio) based on antennomere III: scape = 0.98; pedicel = 0.18; IV = 1.09; V = 0.93; VI = 0.89; VII = 0.82; VIII = 0.72; IX = 0.68; X = 0.63; XI = 0.64.

Thorax. Prothorax 1.17 times wider than long; sides sub-parallel with blunt, indistinct tubercle at about midlength. Pronotum moderately finely punctate, punctures separated by diameter of two or more puncture; with irregular, moderately wide, longitudinal band of brownish-orange pubescence centrally; on each side with longitudinal band of dense brownish-orange pubescence; remaining surface with very short and sparse whitish pubescence and a few brownish orange setae. Sides of prothorax coarsely, moderately abundantly punctate (punctures finer, sparser than on pronotum); with wide longitudinal band of brownish orange pubescence at about middle, anteriorly projected toward procoxal cavity; remaining surface with yellowish white pubescence not obscuring integument. Prosternum with a few fine punctures centrally, nearly smooth on remaining surface; with yellowish white pubescence not obscuring integument. Prosternal process finely, sparsely punctate; with decumbent yellowish white pubescence not obscuring integument. Mesoventrite notably transversely depressed close to apex of prosternal process; with slightly conspicuous yellowish white pubescence on depressed area, more conspicuous laterally. Mesanepisternum with brownish orange pubescence close to mesoventrite, gradually denser, distinctly. Mesepimeron with brownish-orange pubescence obscuring integument. Metanepisternum with dense yellow pubescence. Metaventrite with slightly conspicuous longitudinal band of brownish orange pubescence close to lateral curvature interspersed with whitish on anterior half; remaining surface with yellowish white pubescence not obscuring integument. Scutellum with yellow pubescence. Elytra. Coarsely, abundantly punctate on basal half, gradually finer, sparser toward apex (nearly smooth on distal quarter); with wide, short sutural band ending on first third and 4 longitudinal bands of brownish-orange pubescence starting on base: two dorsal, interrupted on basal tumescence, the innermost of which turns toward suture where it continues, ending at apical fourth, the second ends more or less on middle of elytron before oblong brown spot; the third (humeral) shortly interrupted before middle of elytra, surrounded posteriorly the oblong spot and fuses with the first; the fourth on external side of elytra. Area between elytral bands with whitish pubescence on basal half, denser, forming spot behind basal tumescence; apical fifth covered with whitish pubescence at base becoming yellow toward apex and with brown anchor-shaped spot at middle; remaining surface with very fine yellowish white pubescence; apex slightly obliquely truncate, with outer angle triangularly projected. Legs. Femora dark brown, reddish at base, with yellow pubescence partially obscuring integument. Tibiae with integument yellow except on apex, which is reddish brown; with yellow pubescence on light areas and dark reddish brown pubescence and erect setae on darker areas. Tarsomeres I–III on all legs yellowish except the blackish apex. Metatarsomere I as long as 0.41 times I–III together; metatarsomere V (without claws) as long as I–III together.

Abdomen. Ventrites with four longitudinal bands of yellow pubescence, remaining surface with whitish pubescence not obscuring integument; apex of ventrite V with long, nearly erect dark brown setae; apex of ventrite V truncate, slightly depressed centrally on apical half.

Dimensions in mm (holotype female). Total length, 8.98; prothorax: length, 1.64; anterior width, 1.76; posterior width, 1.84; widest prothoracic width, 1.92; humeral width, 2.56; elytral length, 6.53.

Type material. Holotype female from VENEZUELA, Miranda: P. Nac. Guatopo, 500 m, 5.III.1986, Bordon leg.( MIZA).

Etymology. This species is named for Marco A. Gaiani in acknowledgment of his help with informatics and photography to one of the authors (L. J. J.).

Remarks. Few species of RΟsalba have the apical region of the elytra covered by whitish or yellowish white pubescence: RΟsalba albΟapicalis ( Breuning, 1940), R. cacapyra Galileo & Martins, 2013 , R. fΟrmΟsa Martins & Galileo, 2008, R. seraisΟrum sp. nov., and R. mΟnnei Audureau, 2016. RΟsalba gaianii sp. nov. differs from all of them by the following combination of characters: Antennae light brownish-orange, except dorsal side of scape and extreme apex of the antennomeres, which are black; median longitudinal groove carinate on vertex; prothorax subcylindrical, with lateral sides more or less straight; pronotum medially with a moderately wide, pubescent yellow longitudinal band with irregular borders; apical fifth of the elytra covered with whitish pubescence, yellowish toward apex, and with a brown anchor-shaped spot at middle; abdominal ventrites with 4 longitudinal bands of orange pubescence. RΟsalba albΟapicalis has the antennae light reddish-brown, gradually darker toward apex of segments; central longitudinal band of the pronotum narrow with well-defined lateral borders; the whitish apical area is limited anteriorly by a transversal undulate line; and the abdominal ventrites I, II, III and V have a dark lateral spot. RΟsalba cacapyra has the antennomeres IV–XI black with orange basal ring; median longitudinal groove not carinate; pronotal longitudinal, central band with yellowish pubescence slightly distinct and narrow; apical third of the elytron with a small oblique band with whitish pubescence; and abdominal ventrites I and II with lateral spots of black integument, and V with two longitudinal black bands. RΟsalba fΟrmΟsa has the basal half of the antennomeres III–XI reddish-brown covered with whitish pubescence; median longitudinal groove not carinate; central longitudinal band of the pronotum narrow, with well-defined lateral borders; apical area of whitish pubescence not reaching apex and is preceded by a transversal dark band; abdominal ventrites II–IV with pinkish pubescence concentrated in spots. RΟsalba seraisΟrum has the base of the antennomeres III–XI reddish, this area covering half of antennomere III, gradually shorter towards XI; pronotum without distinct central band of yellow pubescence and very different elytral pattern. RΟsalba mΟnnei has the antennomeres apparently lighter at base; pronotum without longitudinal, central band of yellowish pubescence; apical third of the elytron covered with two white bands separated by a darker area.

Figures

FIGURES 121–128. 121–124, R. pittieri, holotype male: 121, dorsal habitus. 122, ventral habitus; 123, lateral habitus; 124, head, frontalview.125–128, R.gaianii, holotype female:125, head,frontalview;126, dorsal habitus; 127, ventral habitus; 128, lateral habitus.