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brown powderpost Beetle

Scientific Name
Lyctus brunneus
Scientific Author
(Stephens, 1839)
Taxonomy
(Coleoptera: Bostrichidae: Lyctinae: Lyctini)
Status
Exotic Species Occurrence in Australia
Reliability
High
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Diagnostic Notes
The tribe Lyctini is characterised by:

- Hind coxae distinctly separated

- At least the outer two-thirds of each elytron with complete, even or uneven, longitudinal rows of punctures and corresponding hairs

- Metathoracic femur relatively slender, nearly club shaped and not compressed

The genus Lyctus is characterised by:

- Body length: 1.5-8.0mm

- Pronotum without tubercles, teeth, small lobes or ridges

- Frons never with a medium tooth or tubercle

- Dorsal vestiture not erect

- Both antennal club segments subequal in length but the first is normally shorter than the second

- First antennal club segment wider or as wide as second segment

- Second antennal club segment ovoid, conoid, ellipsoid or pear shaped

- Anterior tibiae not strongly enlarged at the apex

- Anterior tibiae acutely produced externally and with a large, curved spine

There are 26 known valid species in this genus.

Diagnostic characteristics of this species include:

- Body length: 2.0-8.0mm

- Inner half of middle one-third of each elytron with confusedly arranged hairs

- 3 or 4 more or less confused and indistinct rows of punctures between the elytral suture and the first clearly traceable row of punctures

- Female posterior margin of 5th visible sternite with a small but distinct medium bunch or "pencil" of yellow hair

- Male without bunch of similar hair

- Pronotum usually with a shallow, longitudinal depression which is often divided anteriorly. This Y-shaped depression may be vague or absent in smaller specimens.

- Frontal lobe usually (and postclypeal lobe often) - distinctly raised and distinctly thinkened forming a noticeable notch between them. However, sometimes the lobes are continuous.

Source: Graham Goodyer 2008 (unpublished) Identification of Bostrichid beetles to Genus and Species.

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