Oncid ID: Tool for Diagnosing Adult Twig Girdlers (Cerambycidae: Lamiinae: Onciderini)
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Genus: Trestonia

Diagnostic Features
  • Description: Elongate to elongate-oblong, small to moderate-sized, ranging from about 10–19 mm in length. Integument generally dark brown or black with whitish, black, brown, ferrugineous, and ochraceous pubescence. Head with frons subquadrate to elongate, about as wide as width of 2 1/2 lower eye lobes. Eyes with lower lobes oblong. Genae variable in shape, from subquadrate to elongate, distinctly shorter than lower eye lobes. Antennal tubercles prominent, widely separated; tubercles not armed at apex or armed with a small projection, or with a short, blunt horn, or with a moderately long, blunt horn or large blunt process; antennae about as long as overall body length, or as much as twice as long (males); scape clavate, shorter than antennomere IV; antennomere III variable in shape, from nearly straight to curved to sinuate, longer than scape and about as long or longer than antennomere IV; antennomere XI shorter than X (females) or longer than X (males). Pronotum subquadrate to transverse, roughly cylindrical to conical, distinctly narrower at base, with or without lateral tubercles. Elytra with sides roughly parallel to slightly attenuate; elytral apices individually rounded; elytra generally uniform in coloration or speckled, or with distinct maculae; base of elytra without tubercles or with two prominent tubercles at humeri. Basal 1/3 of elytra with moderate to dense punctation, surface coarsely punctate or granulate-punctate. Procoxae without projection or with an obtuse tubercle or with distinct, curved hook (males). Mesosternal process with apex subtruncate to feebly emarginate. Metafemora short to distinctly short in length, about 1/4–1/5 as long as elytra.

  • The combination of the following characters will help to distinguish this genus: moderately large eyes; elytra with sides roughly parallel to slightly attenuate; and short metafemora.

  • Similar genus/genera: superficially resembles Apocoptoma, Chitron, and Leus.
Geographic Distribution
  • Lesser Antilles (Grenada, Guadeloupe, Martinique)
  • Central America (Nicaragua to Panama)
  • South America (Argentina, Bolivia, Brazil, Colombia, Ecuador, French Guiana, Paraguay, Peru, Suriname, Trinidad & Tobago)
Host Plants/Trees
  • Apocynaceae (Forsteronia thyrsoidea); Elaeocarpaceae (Sloanea massoni); Lauraceae (Persea americana [avocado]); Mimosaceae (Acacia tortuosa, Inga ingoides); Moraceae (Ficus subtriplinervium); Papilionaceae (Cajanus indicus, Lonchocarpus sp.)
Girdling Behavior
  • Martins (1975) reported that members of this genus oviposit in dead wood.

The genus Trestonia currently contains 21 species:
  Trestonia albilatera (Pascoe, 1859) [type specimen, ♂]
  Trestonia assulina Bates, 1874 [type specimen, ♀]
  Trestonia bilineata Martins, Galileo & Tavakilian, 2008
  Trestonia capreola (Germar, 1824)
  Trestonia ceara Dillon & Dillon, 1946 [holotype specimen, ♂]
  Trestonia confusa Dillon & Dillon, 1946
  Trestonia exotica Galileo & Martins, 1990 [holotype specimen, ♂]
  Trestonia fasciata Martins & Galileo, 1990 [holotype specimen, ♀]
  Trestonia forticornis Buquet, 1859 [type specimen, ♂]
  Trestonia frontalis (Erichson, 1847) [holotype specimen, ♀]
  Trestonia fulgurata Buquet, 1859 [type specimen, ♀]
  Trestonia grisea Martins & Galileo, 1990 [holotype specimen, ♂]
  Trestonia lateapicata Martins & Galileo, 2010 [holotype specimen, ♂?]
  Trestonia morrisi Martins & Galileo, 2005 [holotype specimen, ♂]
  Trestonia morrisi Martins & Galileo, 2005 [♀ specimen]
  Trestonia nivea Martins & Galileo, 1990 [holotype specimen, ♂]
  Trestonia pulcherrima Dillon & Dillon, 1946 [holotype specimen, ♂]
  Trestonia pyralis Dillon & Dillon, 1946 [holotype specimen, ♂]
  Trestonia rugosicollis Martins, Galileo & de-Oliveira, 2009
  Trestonia signifera Buquet, 1859 [type specimen, ♂?]
  Trestonia turbula Monné & Fragoso, 1984 [holotype specimen, ♂]
  Trestonia wappesi Nearns & Swift, 2011 [holotype specimen, ♂]

Generic Synonymies
  • None
Selected References

Trestonia morrisi
♀ specimen
© E.H. Nearns


© 2011-2015 Nearns, E.H., Lord, N.P., and K.B. Miller
The University of New Mexico and Center for Plant Health Science and Technology, USDA, APHIS, PPQ.