Coleoptera - Beetles

The order Coleoptera covers a huge number of species, including ~4000 known species in the UK. They vary considerably in size, shape and colouration. They are easily recognised by the presence (usually) of the elytra - modified hardened forewings. The protective elytra usually cover the entire abdomen - rove beetles excepted. The hind wings are membranous and used for flight - it is often an art form the way the wings are packaged away again beneath the elytra. The legs vary depending on the purpose of their use - compare the thick strong legs of dung beetles to the thinner lithe legs of the tiger beetles, and the modified 'paddles' of some diving beetles. The number of tarsal segments and shape of the coxa (1st leg segment) are important for identification. The prothorax is hardened and shielded by the tough pronotum. The shape and segment numbers of the antennae are important for identification. The mandibles are designed for biting and chewing, distinguishing beetles from the bugs that have sucking mouthparts.

Beetles undergo complete metamorphosis, generally with no care from the parents. The larvae are varied, generally with three pairs of legs. A beetle can be found that devours almost any foodstuff ranging from nectar, carrion, grain, plant material (roots, stems, leaves, fruits) and even wooden furniture.

Unidentified beetle larvae
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  Unidentified beetle larvae

Beetle larva - ground beetle?? (9-10 mm) - Resting beneath a plank of wood - no obvious food around except woodlice and some slugs. Observed late April'06. Image taken at Clattinger Farm, near Minety, Cotswolds, Wiltshire .

Click for full size image
Click for full size image

Beetle larva - possible leaf beetle?? (7-8 mm) - Was dead after being attacked by a crab spider (Xysticus spp). Observed early May'06. Image taken at Martin Down, near Salisbury, Wiltshire .

Click for full size image
Click for full size image

Beetle larva - possible carabid or staphylinid?? (9-11 mm) - Found walking along a path. Observed early June'06. Image taken at River Avon, Salisbury, Wiltshire .