Elongate-oblong, moderate to large-sized, ranging from about 14–23 mm in length. Integument generally dark brown with whitish, ferrugineous, and ochraceous pubescence. Head with frons subquadrate, about as wide as width of two lower eye lobes. Eyes with lower lobes oblong. Genae elongate, distinctly shorter than lower eye lobes. Antennal tubercles prominent, widely separated; tubercles not armed at apex. Antennae about as long as overall body length, or as much as 1 1/3 times as long; scape gradually expanded to apex, about as long as antennomere IV; antennomere III curved, longer than scape and antennomere IV. Pronotum transverse, roughly cylindrical to conical, wider at base, without lateral tubercles. Elytra with sides roughly parallel; elytral apices individually rounded; elytra generally uniform in coloration or speckled, or with distinct maculae; base of elytra without prominent tubercles at humeri. Basal 1/3 of elytra with dense punctation, surface coarsely punctate to granulate-punctate. Procoxae without projection. Mesosternal process with apex subtruncate to feebly emarginate. Metafemora moderate to short in length, about 1/3–1/4 as long as elytra.
The combination of the following characters will help to distinguish this genus: large eyes; subquadrate frons; gradually expanded scape; pronotum distinctly narrower than elytral humeri, without lateral tubercles; and elytra with sides roughly parallel.
Superficially resembles Cordites and Ischiocentra.
South America (Brazil)
Unknown
Unknown
The genus Ischiosioma currently contains two species: I. albata Martins and Galileo, 1990Martins and Galileo, 1990:
Martins UR, Galileo MHM. 1990. Onciderini (Coleoptera, Cerambycidae, Lamiinae): sinonimias, novos taxons, chaves e notas. Papeis Avulsos de Zoologia. 37(4):53–95.; I. obliquata Martins and Galileo, 1990Martins and Galileo, 1990:
Martins UR, Galileo MHM. 1990. Onciderini (Coleoptera, Cerambycidae, Lamiinae): sinonimias, novos taxons, chaves e notas. Papeis Avulsos de Zoologia. 37(4):53–95..
More species images are available in the Gallery.
Ischiosioma Martins and Galileo, 1990Martins and Galileo, 1990:
Martins UR, Galileo MHM. 1990. Onciderini (Coleoptera, Cerambycidae, Lamiinae): sinonimias, novos taxons, chaves e notas. Papeis Avulsos de Zoologia. 37(4):53–95.
subtribe: Onciderina
type species: Ischiosioma obliquata Martins and Galileo, 1990Martins and Galileo, 1990:
Martins UR, Galileo MHM. 1990. Onciderini (Coleoptera, Cerambycidae, Lamiinae): sinonimias, novos taxons, chaves e notas. Papeis Avulsos de Zoologia. 37(4):53–95.
Bezark and Monné (2013)Bezark and Monné (2013):
Bezark LG, Monné MA. 2013. Checklist of the Oxypeltidae, Vesperidae, Disteniidae and Cerambycidae, (Coleoptera) of the Western Hemisphere., Martins and Galileo (1990)Martins and Galileo (1990):
Martins UR, Galileo MHM. 1990. Onciderini (Coleoptera, Cerambycidae, Lamiinae): sinonimias, novos taxons, chaves e notas. Papeis Avulsos de Zoologia. 37(4):53–95., Monné (2005)Monné (2005):
Monné MA. 2005. Catalogue of the Cerambycidae (Coleoptera) of the Neotropical Region. Part II. Subfamily Lamiinae. Zootaxa. 1023:1–759.
