Beetles II (Coleoptera)

The order with the most numerous species, the coleoptera make up about 40% of all insect species.  Known commonly as beetles their body plan doesn’t vary drastically within the order however homologous structures are often put to different uses.  This chart shows adult forms (5, 10, 14, 15 & 17) highlighting the segmentation of the body into the head (I), prothorax (II), mesothorax (III), metathorax (IV) and abdomen (V).  Two forms of larva are also illustrated; the scarabeiform larva (1) which usually reside within their food (eg. within a tree trunk) and the highly mobile elateriform larva (16) usually associated with ground dwelling and predatory forms.

Potato Beetle (Leptinotarsa decemlineata; Coleoptera)

The order with the most numerous species, the coleoptera make up about 40% of all insect species.  Known commonly as beetles their body plan doesn’t vary drastically within the order however homologous structures are often put to different uses.  This chart shows the development (1) of the potato beetle (Leptinotarsa decemlineata) from eggs (a) through the four instars of larvae (b I-IV) and the inactive pre-pupal larva (bV) before skipping the pupal stage to show the adult form (c).  The pre-pupa (2), pupa(3 & 4) and adult (5) are also shown enlarged.  Sketches of an antennae (6), leg (7) and mouthparts (8) are also illustrated.