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tropical nut borer

Scientific Name
Hypothenemus obscurus
Scientific Author
(Fabricius, 1801)
(Coleoptera: Curculionidae: Scolytinae: Cryphalini)
Exotic species - absent from Australia

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Diagnostic Images

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Diagnostic Images (9)
Diagnostic Notes

Body length 1.4-1.5 mm.Anterior margin of pronotum armed with 4-6 teeth, slope of pronotum with more than 25 coarse asperities. Frons with median groove extending to level of upper eyes. Elytral ground vestiture of fine confused hairs, well-developed at least on postero-lateral part of elytra, in addition to uniseriate rows of erect interstitial scales and fine strial hairs.  

Generic characters of Hypothenemus: Eyes emarginate, antennal club with 3 sutures indicated by rows of hairs, summit of pronotum in middle, elytral ground vestiture either absent or hairlike:

 Key to species on PaDIL (Modified from Beaver & Maddison 1990 - see references):

 1. Frons with a round median tubercle at level of top of eyes, shallow groove below tubercle; no ground vestiture on elytra; body; length 1.5mm Hypothenemus crudiae

 - Frons not as above; elytral ground vestiture present or not present .. 2

 2. Anterior margin of pronotum with 4 teeth, median pair larger; frons without a median groove; elytral vestiture scalelike on declivity; body length 1.5-2.2mm Hypothenemus birmanus

- Anterior margin of pronotum with 6 teeth, all about same size; frons with or without median groove; elytral vestiture hairlike of absent ... 3

 3.  Frons without a median groove; ground vestiture hair type combines simple and scale like hair; body length 1.0-1.3mm Hypothenemus eruditus

- Frons with a median groove ... 4

4. Ground vestiture hair type of simple hair only; body length 1.4-1.6mm. Hypothenemus hampei

-  Ground vestiture absent; body length 1.4-1.5

5. Elytral surface smooth and shining; frons median groove not extending to upper level of eyes.. Hypothenemus seriatus

- Elytral surface densely micropunctate to minutely rugose; frons with median groove extending to upper level of eyes ... Hypothenemus obscurus


More Information
Walker, K.
13/05/2008 10:20 AEST
Last Updated
25/11/2011 10:32 AEST
Walker, K. (2008) tropical nut borer (Hypothenemus obscurus) Updated on 11/25/2011 10:32:06 AM Available online: PaDIL -
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Free for use under the Creative Commons Attribution 3.0 Australia License