Two compound eyes and two pairs of antennae. They contain appendages modified for grabbing and feeding. Their excretory organ consists of a sac-like green gland. They breathe through gills. They contain 5 pair of walking legs.
Barnacles are sessile crustaceans that have a modified exoskeleton in the form of a shell.
They exist in almost every environment known to man. Their ability to fly and live off of plants and flowers has given them this success. They contain one pair of antennae, a pair of compund eyes, and various modified mouth parts. The thorax contains the six legs and two pair of wings. They contain a tracheal respiratory system and excrete their liquid waste through Malpighian tubules.