Crayfish

CRAYFISH Body: Two segments: Cephalothorax: Fused head and thorax 13 segments covered by a hard carapace Abdomen: 7 segments Mandibles: jaws for chewing (crush food) Maxillae: holds food and passes it to the mandibles and the mouth (tear food) Maxillipeds: sense organs which also help pass food to the mouth Chelipeds: large, pincer appendages for food getting and protection Antennae: segmented sense organs on the head (touch/taste) Antennule: segmented sense organ (touch/taste/equilibrium) Walking legs: four pairs Swimmerets: aid in swimming and holding fertilized eggs in the female Blood returns to the heart through a slit (osita) Green gland: nitrogenous waste excretion (located in the head) Senses: compound eye /balance organ Reproduction: sexual (distinct sexes) Respiration: gills

Abdomen

Antennae

Antennule

Carapace

Cephalothorax

Cheliped

Digestive Gland (Dorsal)

Digestive Gland (Lateral)

Eggs

Esophagus

External View (Dorsal)

External View (Ventral)

Eye

Female

Male

Ganglion Anterior

Ganglion Posterior

Gill

Gonad

Green Gland

Heart

Intestine

Mandible

Maxilla

Maxillaped

Muscle

Stomach

Swimmeret

Telson

Uropod

Ventral Nerve Cord

Ventral Nerve Chord Posterior

Walking Leg

MOLTING