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smooth spider beetle

Scientific Name
Gibbium aequinoctiale
Scientific Author
Boieldieu
Taxonomy
(Coleoptera: Anobiidae: Ptininae: Gibbiini)
Status
Exotic Species Occurrence in Australia
Reliability
High
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Diagnostic Notes

Mite like appearance, distinnctive due to the pronotum and elytra being devoid of setae and punctation; Adult body length c. 1.7-3.2mm; body colour variable from red to nearly black, with dense, short, yellow hairs beneath.

Resembles Mezium americanum, can be separated by Gibbium aequinoctiale with head and thorax entirely bare, while M. americanum head and thorax with dense covered of mall scales and scale-like hairs.

This insect is tolerant of cool conditions and can survive for long periods without food supplies.

Note:  Gibbium psylloides was reported as having a cosmopolitan distribution whereas the correct species with that distribution is Gibbium aequinoctiale. Gibbium psylloides is restricted to the Palaearctic (Europe and Mediterranean) region, south east Asia and North Africa.

Adults of the two species can be separated as on the shape of the antennal fossa and male genitalia characters.

The antennal fossa character is:

Gibbium aequinoctiale: Median confluence of antennal fossas forming a right angle (see image), posterior border of antennal fossas weakly produced laterally and transverse on lateral one third.

 Gibbium psylloides: Median confluence of antennal  fossas forming an acute angle, posterior border of antennal fossas strongly produced laterally and sloping on lateral one third.

Sources:

See Canadian Beetle Identification Guide weblink

See Insects and Mite Pests in Food - an illustrated key weblink

More Information
Specimen Contact
Museum Victoria
Author
Walker, K.
Created
17/03/2007 09:15 AEST
Last Updated
30/08/2011 16:45 AEST
Citation
Walker, K. (2007) smooth spider beetle (Gibbium aequinoctiale) Updated on 8/30/2011 4:45:02 PM Available online: PaDIL - http://www.padil.gov.au.
Image Use
Free for use under the Creative Commons Attribution 3.0 Australia License

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