Psyrassa belangeri,

Santos-Silva, Antonio, Botero, Juan Pablo & Tirant, Stéphane Le, 2018, A new genus, four new species and taxonomic and geographic notes in Mexican Cerambycidae, Zootaxa 4420 (2), pp. 189-210: 199-200

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Psyrassa belangeri

sp. nov.

Psyrassa belangeri  , sp. nov.

( Figs. 18–22View FIGURES 14–22. 14–17)

Description. Female. Integument mostly dark reddish brown, in some areas almost brown or slightly lighter depending on angle of light source; scape reddish brown; basal antennomeres black, gradually reddish brown toward XI; elytra dark reddish brown at about basal half, black on remaining surface; femora reddish brown; tibiae mostly reddish brown with dark areas; tarsomeres I –II dark brown and tarsomeres III –V mostly reddish brown; abdomen black except reddish narrow distal area of ventrites I –IV.

Head. Frontal plate smooth; remaining surface of frons finely, sparsely punctate, except area close to lower eye lobes with dense punctures; with minute, sparse yellowish white setae. Vertex distinctly depressed between antennal tubercles and upper eye lobes, then gradually elevated toward prothoracic margin; finely, sparsely punctate between antennal tubercles, coarsely, moderately sparsely punctate between upper eye lobes and prothoracic margin; with minute, sparse yellowish white setae interspersed with a few long, erect, yellowish setae close to eyes. Area behind upper eye lobes coarsely, moderately abundantly punctate; glabrous. Area behind lower eye lobes nearly smooth, glabrous. Genae short (anterior margin of lower eye lobe almost touching middle distal margin), finely, abundantly punctate close to eye, smooth toward apex; with short, sparse yellowish setae close to eye, glabrous toward rounded apex. Antennal tubercles finely, sparsely punctate except smooth apex; with minute, sparse yellowish white setae except on glabrous apex. Median groove distinct from clypeus to near prothoracic margin. Postclypeus finely, abundantly, shallowly punctate on wide central area, smooth laterally; with minute, sparse yellowish white setae on punctate area; with long, erect yellow seta on each side of punctate area. Labrum coplanar with anteclypeus at basal 2/3, slightly concave toward apex centrally, inclined at distal third; with minute, sparse yellowish white setae interspersed with long, erect golden setae. Gulamentum smooth, glabrous between prothoracic margin and distal margin of lower eye lobes, striate-punctate and with long, erect, sparse yellowish white setae on remaining surface. Distance between upper eye lobes 0.83 times length of scape; in frontal view, distance between lower eye lobes equal to length of scape; upper eye lobes with 3 rows of ommatidia. Antennae 1.35 times elytral length, reaching elytral apex at apex of antennomere XI. Scape coarsely, confluently punctate dorsally and laterally, except for smooth distal laterodorsal area; with short, sparse yellowish white setae, interspersed with a few long, erect setae ventrally and laterally. Antennomeres with short yellowish pubescence, gradually denser toward XI; with long, erect yellowish setae ventrally on III –X; III –X with a few long, erect yellowish setae at apex of dorsal surface; antennomeres III –VII dorsally carinate (gradually less distinct toward VII). Apical spine of antennomere III straight, acute at apex, with 0.28 times length of antennomere; apical spine of antennomere IV with 0.12 times length of antennomere; remaining antennomeres with unarmed apex. Antennal formula (ratio) based on length of antennomere III (excluding spine): scape = 0.75; pedicel = 0.20; IV = 0.78; V = 0.78; VI = 0.83; VII = 0.84; VIII = 0.79; IX = 0.78; X = 0.70; XI = 0.86.

Thorax. Prothorax longer than wide (1.15 times); sides slightly rounded between basal and distal constrictions. Pronotum finely, sparsely punctate interspersed with some coarse punctures, except on smooth central area between basal constriction and middle; with short, sparse, erect yellowish setae, slightly longer and more abundant laterally, except glabrous smooth area. Sides of prothorax moderately coarsely, sparsely punctate close to pronotum, distinctly denser toward prosternum, except transversely striate basal area and striate punctate distal area (punctures sparse); with long, erect, sparse yellowish setae except on glabrous basal area. Prosternum slightly striate-punctate on basal half, transversely striate on distal half; with grayish white pubescence on basal half, not obscuring integument, interspersed with a few long, erect yellowish setae; with short and long, erect, sparse yellowish setae on distal half; prosternal process gradually narrowed toward distal third, then distinctly widened. Procoxal cavities open posteriorly. Mesoventrite depressed centrally; with sparse grayish white pubescence centrally, denser laterally. Mesanepisternum, mesepimeron and metanepisternum with dense grayish white pubescence. Metaventrite coarsely, moderately sparsely punctate; with narrow grayish white pubescent band close to metanepisternum and mesocoxal cavity, with sparse, erect yellowish setae on remaining surface. Scutellum with grayish white pubescence obscuring integument. Elytra. Slightly, gradually narrowed toward apex; apex truncate, with rounded outer angle and with triangular projection at sutural angle; coarsely, abundantly punctate except nearly smooth distal seventh; with long, erect, sparse yellowish setae throughout. Legs. Femora coarsely, abundantly punctate, gradually coarser, confluent toward apex; with long, erect, sparse golden setae. Tibiae with long, erect golden setae, distinctly denser ventrally toward apex.

Abdomen. Ventrites I –IV finely, moderately sparsely punctate; with short and long, erect, sparse yellowish setae on wide central area, with short, moderately dense grayish white pubescence laterally. Ventrite V finely, sparsely punctate (punctures finer than on remaining ventrites), with short and long, sparse yellowish setae; distal margin slightly rounded.

Male. General integument in both paratypes is more reddish; in one paratype the metanepisternum is reddish brown with sides black; in both paratypes the head has black areas; in one paratype the basal antennomeres are dark reddish brown; in both paratypes the tarsi is mostly dark reddish brown and the basal area of the elytra is notably contrasting with dark distal area, which is dark brown in one paratype. Sutural apex of elytra without distinct projection. Antennae 1.6 times elytral length, reaching elytral apex at middle of antennomere X; antennomere V with spicule at inner apex in one paratype. Distal margin of abdominal ventrite V slightly, widely concave.

Dimensions in mm (holotype female/ paratype males). Total length, 12.70/12.45–14.55; prothoracic length, 2.55/2.35–2.90; basal prothoracic width, 1.90/1.75–2.10; distal prothoracic width, 1.90/1.75–2.05; widest prothoracic width, 2.25/2.00–2.35; humeral width, 2.75/2.55–3.00; elytral length, 9.40/8.80–10.10.

Type material. Holotype female from MEXICO, Guerrero: Xalitla (588 m), 12.VI.2010, D. Curoe col. ( MZSP). Paratypes— 1 male, same data as holotype except 600 m, 1.VIII.2011 ( IMQC)  ; 1 male, same data as holotype except 590 m, 11.VIII.2010 ( MZSP). 

Etymology. This species is dedicated to our collaborator Pierre Bélanger.

Remarks. The general appearance of P. belangeri  sp. nov. resembles that of several species of the genus. However, it differs from the species with spine of the antennomere III acute at apex, and with procoxal cavities open behind. It differs from P. ebenina Linsley, 1935  , and P. levicollis Chemsak & Noguera, 1993  , by the upper eye lobes with 3 rows of ommatidia (5 in P. ebenina  and P. levicollis  ), elytra not pubescent (pubescent in P. ebenina  and P. levicollis  ), and elytral apex rounded at outer angle (spiniform in P. ebenina  and P. levicollis  ); it differs from P. oaxacae Toledo, 2002  , by the spine of antennomere III about as long as pedicel (almost 2 times length of pedicel in P. oaxacae  ); outer elytra apex rounded (projected in P. oaxacae  ), and antennae in male surpassing elytral apex (not reaching in P. oaxacae  ). It can be separate from P. unicolor (Randall, 1838)  by the dark color (light in P. unicolor  ), and by the elytral apex not spiniform at outer angle (spiniform in P. unicolor  ).


Sao Paulo, Museu de Zoologia da Universidade de Sao Paulo