Oncid ID: Tool for Diagnosing Adult Twig Girdlers (Cerambycidae: Lamiinae: Onciderini)
Home   ¦   Twig Girdlers   ¦   Key to Genera   ¦   Genus Fact Sheets   ¦   Gallery   ¦   Morphological Atlas   ¦   Glossary   ¦   References   ¦   About

Previous Genus       Next Genus

Genus: Tulcus

Diagnostic Features
  • Description: Elongate-ovate, small to large-sized, ranging from about 9–21 mm in length. Integument generally dark brown or black with whitish, ferrugineous, brown, black, and ochraceous pubescence. Head with frons elongate, about as wide as width of 1 1/2 lower eye lobes. Eyes with lower lobes ovate-oblong. Genae elongate, about as tall or distinctly shorter than lower eye lobes. Antennal tubercles prominent, moderately to narrowly 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; antennae shorter (females) than overall body length, or as much as twice as long (males); scape clavate, about as long or longer than antennomere IV; antennomere III sinuate, longer than scape and antennomere IV. Pronotum transverse, conical, distinctly wider at base, without lateral tubercles. Elytra with sides attenuate; elytral apices individually rounded; elytra generally uniform in coloration or speckled, or with distinct maculae; base of elytra with two prominent tubercles at humeri. Basal 1/3 of elytra with moderate to dense punctation, surface finely punctate, coarsely punctate, or granulate-punctate. Procoxae without projection or with distinct, curved hook. Mesosternal process with apex feebly to deeply emarginate. Metafemora long to moderate in length, about 1/2–1/3 as long as elytra.

  • The combination of the following characters will help to distinguish this genus: moderately ovate form; sinuate antennomere III; distinctly conical pronotum; base of elytra with two prominent tubercles at humeri; and elytra with sides attenuate.

  • Similar genus/genera: strongly resembles Hypsioma.
Geographic Distribution
  • Central America (all countries)
  • South America (Bolivia, Brazil, Colombia, Ecuador, French Guiana, Peru, Trinidad, Venezuela)
Host Plants/Trees
  • Papilionaceae (Lonchocarpus sp.)
Girdling Behavior
  • Members of this genus are not known to girdle branches (F.T. Hovore, personal communication).

The genus Tulcus currently contains 21 species:
  Tulcus amazonicus (Thomson, 1860) [type specimen]
  Tulcus crudus (Erichson, 1847)
  Tulcus diaphorus Martins & Galileo, 2009
  Tulcus dimidiatus (Bates, 1865) [type specimen, ♂]
  Tulcus distinctus (Dillon & Dillon, 1945) [holotype specimen, ♀]
  Tulcus fulvofasciatus (Dillon & Dillon, 1945)
  Tulcus hebes (Dillon & Dillon, 1945)
  Tulcus liturus (Dillon & Dillon, 1945) [holotype specimen, ♀]
  Tulcus lycimnius (Dillon & Dillon, 1945) [holotype specimen, ♂]
  Tulcus obliquefasciatus (Dillon & Dillon, 1952)
  Tulcus paganus (Pascoe, 1859) [type specimen]
  Tulcus pallidus (Dillon & Dillon, 1945)
  Tulcus pepoatus (Martins & Galileo, 1996) [holotype specimen, ♂]
  Tulcus picticornis (Bates, 1865) [type specimen]
  Tulcus pigrus (Martins & Galileo, 1990) [holotype specimen, ♀]
  Tulcus pullus (Dillon & Dillon, 1945)
  Tulcus signaticornis (Thomson, 1868) [type specimen]
  Tulcus somus (Dillon & Dillon, 1945) [holotype specimen, ♀]
  Tulcus subfasciatus (Thomson, 1860) [♀ specimen]
  Tulcus subfasciatus (Thomson, 1860) [type specimen]
  Tulcus thysbe (Dillon & Dillon, 1945) [holotype specimen, ♂]
  Tulcus tigrinatus (Thomson, 1868) [type specimen]

Generic Synonymies
  • The type species of this genus was originally described in the genus Hypsioma; the genus Charoides was synonymized with Tulcus.
Selected References

Tulcus subfasciatus
♀ 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.