Pictures found in: Crayfish
Digestive System: The digestive system of a crayfish is simple compared to other vertebrates, but far more complex than other invertebrates. The tract is composed a foregut (enlarged stomach that is specialized for grinding), the midgut, and the hindgut - leads to anus and regulates salt and water as well. The digestive gland secretes digestive enzymes and aids in the absorption of the products of digestion.
Circulatory System: The circulatory system of the crayfish is centered on a muscular heart with dorsal, anterior, and posterior arteries leading away from it. The heart pumps the blood across the gills which absorbs the oxygen from the water and sends it back to the heart and adjoining arteries.
Nervous System: A crayfish's nervous system is composed of a ventral nerve cord fused with segmental ganglia, and the supresophageal and subesophageal ganglia.
Excretory System: The excretory organs are also called the antennal glands are located at the base of the second antenna. They excrete the waste products of blood filtration.
Integumentary System: The crayfish has a jointed exoskeleton which they shed to allow growth.
Body Plan: The body is divided into two parts: the cephalothorax and the abdomen. The cephalothorax has sensory, feeding, and locomotion functions and the abdomen has locomotion and visceral functions.
Crayfish live in freshwater environments - any where there is a rich muddy water that allow them to hide.
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