Ischasia fasciata Carli, Monné, Santos-Silva & Rafael, 2025, sp. nov.
Creators: name: Carli, Camila Da Silva
name: Monné, Marcela L.
name: Santos-Silva, Antonio
name: Rafael, José Albertino
Publisher: name: Zenodo
Year: 2025
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Cerambycidae
Ischasia
Ischasia fasciata

description: Ischasia fasciata sp. nov.
(Figs 58–63)
Description. Holotype female (Figs 58–61). Integument mostly orangish, darker on some areas, lighter on others. Frons brownish between eyes; vertex with triangular dark brown macula close to prothorax; sides of postclypeus partially dark reddish brown; scape and pedicel dark brown; antennomeres III–VIII orangish basally, this area distinctly longer on VI and shorter on VIII, brown on remaining surface; antennomeres IX–X brown; antennomere XI brown on basal 2/3, gradually lighter toward orangish apex on apical third; mandibles dark reddish brown on basal 3/4, black on apical quarter. Pronotum with four blackish macula, one triangular anterocentrally, one oblique, band-shaped on each side of middle, another longitudinal, located centrally from anterior third to near apex; mesoventrite reddish brown centrally; metanepisterna brownish; sides of metaventrite dark brown and remaining surface irregularly brown, reddish brown, and yellowish brown. Scutellum dark brown. Elytra brown laterally and apically, except orangish epipleural margin, yellowish-brown on remaining surface. Dorsal surface of profemoral club reddish brown; mesofemoral club dark brown dorsally, gradually light reddish brown toward ventral surface; apical 2/3 of metafemoral club dark brown dorsally, gradually reddish brown toward ventral surface. Pro- and mesotibiae orangish basally, dark reddish brown on remaining surface; metatibiae dark reddish brown on apical third. Pro- and mesotarsomeres brown; metatarsomeres I–II light orange; III–V mostly brownish. Sides of dorsal surface of abdomen dark brown and last tergite dark brown with orangish apex.
Head. Frons somewhat sparsely, coarsely punctate; almost all punctures with short, bristly yellowish-white seta inside. Area between antennal tubercles sparsely, finely punctate; with abundant, decumbent yellowish-white setae not obscuring integument, except glabrous median groove. Remaining surface of vertex densely, somewhat coarsely punctate, punctures partially confluent, except smooth central area close to prothorax; with abundant yellowish-white pubescence not obscuring integument, pubescence sparser, shorter posterolaterally, except glabrous longitudinal central area; with long, erect yellowish-white setae interspersed. Area behind eyes abundantly, coarsely punctate, punctures partially confluent; with sparse yellowish-white pubescence. Genae 0.8 times frontal length of lower eye lobe; finely punctate frontally close to eye, coarsely rugose-punctate on remaining frontal surface, except smooth apex, slightly rugose toward ventral surface; subglabrous frontally close to eye, with sparse, both short and moderately long, decumbent yellowish-white setae on remaining frontal punctate area, almost glabrous toward ventral surface. Antennal tubercles very sparsely, finely punctate; with a few short, decumbent yellowish-white setae. Wide central area of postclypeus moderately abundantly and coarsely punctate close to frons, smooth close to anteclypeus; with somewhat sparse, decumbent yellowish-white setae close to frons, glabrous close to anteclypeus; with one long, erect, thick yellowish-brown seta on each side. Sides of postclypeus smooth, glabrous. Labrum sparsely, finely punctate; with a few short, decumbent yellowish-white setae, with long, bristly whitish seta on each side of central region, and tuft of very long, erect yellowish-brown setae laterally; anterior region with dense fringe of whitish setae. Gulamentum smooth, glabrous on posterior third, anterior third transversely rugose-punctate; with sparse, both short and long, erect yellowish-white setae. Distance between upper eye lobes 0.31 times distance between outer margins of eyes; in frontal view, distance between lower eye lobes 0.23 times distance between outer margins of eyes. Antennae 2.3 times elytral length, reaching elytral apex at base of antennomere IX. Scape sparsely, finely punctate, punctures absent on posterior third of dorsal surface; with a few short, decumbent, both whitish and yellowish setae, absent on smooth area of dorsal surface, and a few long, erect yellowish-brown setae interspersed on punctate area. Pedicel with a few short, decumbent white setae and long, erect yellowish-brown setae interspersed. Antennomeres III–IV with a few short, decumbent yellowish-brown setae and long, erect dark-brown setae interspersed especially ventrally and apex. Antennomeres VI–VIII with sparse, short, decumbent brownish setae on light integumental area and moderately abundant brownish pubescence with minute whitish setae interspersed on dark integumental area; with long, erect dark brown setae interspersed ventrally and apically on VI and a few short dark-brown setae directed backward on VII–VIII. Antennomeres IX–XI with abundant brown pubescence partially obscuring integument, with minute bristly whitish setae interspersed, whitish setae more abundant on apical region of XI; with a few short dark-brown setae on apex of IX–X. Antennal formula (ratio) based on length of antennomere III: scape = 1.04; pedicel = 0.41; IV = 0.91; V = 1.21; VI = 1; VII = 0.83; VIII = 0.67; IX = 0.58; X = 0.5; XI = 0.79.
Thorax. Prothorax longer than wide; sides slightly rounded from anterior constriction to lateroposterior angles; anterior constriction slightly well marked. Pronotum smooth close to anterior margin, abundantly, coarsely reticulate-punctate on remaining surface; with moderately abundant yellowish pubescence not obscuring integument on anterior half, pubescence more yellowish-white depending on light intensity, except glabrous smooth anterior area, and sparse yellowish pubescence on posterior half, pubescence more yellowish-white depending on light intensity, except abundant pubescence close to posterior margin; with long, erect yellowish-brown setae interspersed. Sides of prothorax abundantly, coarsely punctate, except subsmooth area close to anterior margin, this area gradually widened toward prosternum; with sparse yellowish pubescence, almost absent on subsmooth area, pubescence more yellowish-white depending on light intensity, except abundant posteriorly and close to procoxal cavity; with a few long, erect yellowish-brown setae interspersed. Posterior half of prosternum sparsely, coarsely punctate laterally, moderately abundantly, coarsely punctate centrally; with sparse yellowish-white pubescence laterally and abundant yellowish-white pubescence not obscuring integument centrally.Anterior half with a few coarse, shallow punctures, more abundant close to anterior constriction; with a few short, decumbent yellowish-white setae. Prosternal process with sparse yellowish-white pubescence on anterior half, sparse on sides of posterior half, and most glabrous on center of posterior half; narrowest area 0.3 times procoxal width. Mesoventrite with somewhat sparse yellowish-white pubescence centrally and dense pubescence of same color laterally. Mesoventral process cordiform on posterior half; with abundant whitish pubescence not obscuring integument, pubescence sparser on posterior half; narrowest area 0.19 times mesocoxal width; apical width 0.51 times mesocoxal width. Mesanepisterna, mesepimera, metanepisterna, and sides of metaventrite with dense pale-golden pubescence; central area of metaventrite with abundant pale-golden pubescence not obscuring integument, except glabrous metathoracic discrimen, and sparse pale-golden pubescence on remaining surface; with a few long, erect setae of same color interspersed. Scutellum with dense pale-golden pubescence. Elytra. Abundantly, coarsely punctate; light integumental area with sparse, both short and moderately long, bristly yellowish setae and long, erect setae of same color interspersed, longer and more abundant on anterior third; dark integumental area with sparse, short, decumbent yellowish-white setae; apex subrounded. Legs. Pro- and mesofemora with sparse, short, decumbent yellowish setae and long, erect yellowish-brown setae interspersed, erect setae longer and more abundant ventrally. Metafemora with sparse, short, decumbent yellowish-white setae on peduncle, absent on club; with moderately long, erect, yellowish-white setae throughout, and long, erect, thick dark-brown setae dorsally and laterally from middle of femoral peduncle to apex. Protibiae with very sparse, short, decumbent yellowish-brown setae dorsally, laterally, and basal third of ventral surface, with a few long, erect yellowish-brown setae interspersed dorsally and laterally, and dense, bristly yellowish-brown pubescence on apical 2/3 of ventral surface. Mesotibiae with pubescence as on protibiae, except dense, bristly yellowish-brown pubescence present only on apical third; with long, erect, thick dark-brown setae interspersed. Metatibiae with a few short, erect yellowish-white setae and long, erect, thick dark-brown setae throughout, erect setae denser, almost forming brush on apical third. Dorsal surface of pro- and mesotarsomeres with moderately sparse yellowish-brown pubescence, with long, erect dark-brown setae interspersed on tarsomeres I–II; dorsal surface of metatarsomeres with abundant whitish pubescence not obscuring integument, and long, erect dark-brown setae on tarsomeres I–II; metatarsomere I 1.55 times longer than II–III together.
Abdomen. Ventrites with a few short, decumbent yellowish-white setae, except glabrous apex of ventrites 1–4, and a few long, erect setae interspersed. Apex of ventrite 5 narrowly rounded.
Variation. Dark macula on vertex close to prothorax transverse; antennomeres III entirely dark brown and VIII entirely brown; central area of ventral surface of head, central area of prosternum, and prosternal process brownish; mesoventrite brown centrally; elytra dark brown laterally and apically, and remaining surface orangish brown; protibiae dark brown; apex of last abdominal tergite almost entirely dark brown.
Dimensions (mm) (Holotype female– paratype female). Total length, 7.75–7.35; prothoracic length, 1.45–1.4; anterior prothoracic width, 1.05–1; posterior prothoracic width, 1.1–1.05; maximum prothoracic width, 1.2–1.25; humeral width, 1.25–1.15; elytral length, 1.9–1.8.
Type material. Holotype female (INPA-COL 002855) from BRAZIL, Amazonas: Manaus, ZF-2, km 14, 2°35’21”S 60°06’55”W, “ Malaise Grande, lado poente,” 8 m, 4–23.X.2017, J.A. Rafael leg. (INPA). Paratypes: 1 female (INPA-COL 002856), same data as holotype except 8–24.XII.2017 (INPA); 1 female (INPA-COL 002857), same data as holotype except 19.IX–03.X.2017 (INPA); 1 female (INPA-COL 002858), same data as holotype except 04–23X.2017 (INPA); 1 female (MNRJ-ENT7-047675), same data as holotype except “lado nascente,” 04–23X.2017 (MNRJ); 1 female (MNRJ-ENT7-047676), same data as holotype except 08–24.XII.2017 (MNRJ); 1 female (MZSP 62721), same data as holotype except 04–17.VII.2018 (MZSP); 1 female (MZSP 62722), same data as holotype except “lado nascente,” 01–18.IX.2018 (MZSP).
Etymology. The specific name “ fasciata,” from the Latin “fascia” (band), refers to the dark bands of the pronotum.
Remarks. The placement of this new species in Ischasia Thomson, 1864 is somewhat problematic due to the presence of abundant erect setae on the apex of the metatibiae. Formerly, the presence of brush of setae on the apical region of metatibiae is the only reliable feature separating Ischasia from Phygopoda Thomson, 1864. The new species also resembles those of the genus Phygopoides Peñaherrera-Leiva & Tavakilian, 2003. However, the antennomere IV is longer than half of III, one of the features defining Phygopoides (antennomere IV very short, about as long as half of III). Therefore, we prefer to include this new species in Ischasia until reliable studies are conducted allowing the separation of these three genera.
Ischasia fasciata sp. nov. differs from the other species of the genus by the metatibiae with the apical setae somewhat forming brush (not forming in the other species of the genus). It is slightly similar to Ischasia mareki Peñaherrera-Leiva & Tavakilian, 2004 (Fig. 57), but differs especially by the pronotum with three dark bands (two in I. mareki).
description: Published as part of Carli, Camila Da Silva, Monné, Marcela L., Santos-Silva, Antonio & Rafael, José Albertino, 2025, Cerambycinae (Coleoptera: Cerambycidae) from the Brazilian state of Amazonas: new species and new geographical records, pp. 1-35 in Zootaxa 5633 (1) on pages 25-28, DOI: 10.11646/zootaxa.5633.1.1, http://zenodo.org/record/15372736