Insect anatomy scheme

A- Head // B- Thorax // C- Abdomen

1 antenna - 2 ocelli (lower) - 3 ocelli (upper) - 4 compound eye - 5 brain (cerebral ganglia) - 6 prothorax - 7 dorsal artery - 8 tracheal tubes (trunk with spiracle) - 9 mesothorax - 10 metathorax - 11 first wing - 12 second wing - 13 mid-gut (stomach)  - 14 heart - 15 ovary - 16 hind-gut (intestine, rectum & anus) - 17 anus - 18 vagina - 19 nerve chord (abdominal ganglia) - 20 Malpighian tubes - 21 pillow - 22 claws - 23 tarsus - 24 tibia - 25 femur - 26 trochanter - 27 fore-gut (crop, gizzard) - 28 thoracic ganglion - 29 coxa - 30 salivary gland - 31 subesophageal ganglion - 32 mouthparts

Source: Wikimedia Commons (File:Robal.png by Piotr Jaworski, PioM)

Bearded dragon (Pogona).

Via Oregon Zoo (link)

Messor pergandei harvester ant. Many desert species have a ‘psammophore’- a basket of long hairs under the head- enabling the ants to carry dry sand. This individual was photographed on glass in the studio.

Palm Desert, California

Credit&Source: Alex Wild Photography

Originally seen at Scientific American: Recipe for a Photograph #1: Reflected Ant on Black.

Female Nephila clavipes on her web. The web was characterized using Brillouin spectroscopy to directly and non-invasively determine the mechanical properties. 

Credit: Jeffery Yarger

Source: ASU scientists unravel the mysteries of spider silk, asu news (Arizona State University)

A computer reconstruction of an adult female baboon skull from high-resolution x-ray computed tomography (CT) slices. The skull is rendered transparent to show the position of the three semicircular canals and cochlea of left inner ear filled in red. The enlargement of the canals and cochlea is five times the size of the canals shown in the skull. Each canal is approximately 5 mm in diameter.

Credit: Alan Walker lab, Penn State.

Source (UC Riverside Newsroom)