Cicada Shell...

Cicadas are classified in the order Hemiptera, which includes all insects with piercing and sucking mouth-parts. (Other insects in this order are bugs, aphids and scale insects). There are more than 200 Australian species of cicadas, most of which belong to the one large family, the Cicadidae. Cicadas are sometimes known as locusts in Australia, but that term is more correctly applied to certain migratory species of grasshopper.

What do cicadas look like?
Adult cicadas have stout bodies with two pairs of wings. The wing spans of the different species range from about 2.5 cm - 15 cm. When not in use, the wings fold back along the sides of the body. The longer fore wing covers the short hind wing, but the wings of each side do not overlap. The fore wing is usually glassy and transparent although in a few species it is dull and opaque. The wings are strengthened by a number of thin, firm veins.

Adult cicadas have three pairs of legs all about the same length. The femur (thigh joint) of the fore leg is thicker than that of the other legs.

Cicadas have large compound eyes situated one on each side of the head They also have three very small glistening simple eyes (ocelli) on the top of the head. The cicada's antennae (feelers) are quite small and bristle-like.

The mouth parts of the cicada are enclosed in a long, thin, beak-like sheath. The sheath (labium) passes backwards from the lower surface of the head between the legs when the insect is not feeding. It contains four fine, needle-like stylets used in feeding.

you can watch a video of a cicada hatching at youtube.com and type cicada hatching.. Its really cool!!