Crayfish, The A Complete Classification, Habitat, Predator And Prey, Body Plan, Nervous System, Circulatory System, Digestive System, And Respiratory System

654 words - 3 pages

ClassificationThe crayfish falls within the kingdom - anamalia, phylum - Arthropoda, Class - Crustacea, Order -Decapoda , and family - Cambaridae.HabitatCrayfish like to be where it's dark and cool, and during much of the daylight they will be found by them selves, under a rock or vegetation, waiting for dark, when they come out to forage for food. This is highly variable, ranging from deep holes to sluggish streams. A suitable habitat is medium-sized streams containing riffles and rocky pools. They burrow very aggressively, burrowing to find warmth, moisture, and food or just to pass the time. In Arizona we are trying to rid of crayfish because they aren't native here and are taking over fish population.Prey & PredatorCrayfish are omnivorous, which is to eat just about anything they can find or catch either dead or alive. Large food is held and torn to pieces in the la ...view middle of the document...

Crayfish are preyed upon heavily by fish, such as trout, pickerel, and bass, and other invertebrates may eat them.Body PlanCrayfish have bodies similar to that of the presumed ancestral crustacean. Such a body is essentially shrimp-like in that it is elongate and nearly cylindrical in cross section. The abdomen is well developed and its segmentation is easily noted. The crayfish has bilateral symmetry, anterior, posterior, dorsal, ventral, right, and left.Nervous SystemThe crayfish nervous system is composed of a ventral nerve cord fused with segmental ganglia, and the supresophageal and subesophageal ganglia. Giant neurons in the ventral nerve cord function in escape responses. The supraesophageal and subesophageal ganglia control the head appendages in response to sensory input received from receptors. Receptors are organs that receive senses and pass these to the brain. Examples are the eyes, antennas, and ears. The tactile recoptors are widley distributed on appendages and joint as they function as equilibrium, balance, and position senses.Circulatory SystemThere is a dorsal tubular heart and several arteries. The crayfish has an open circulatory system in which the blood flows from arteries into sinuses, or spaces, in tissues. The blood flows over the gills before returning to the heart.Digestive SystemThe maxillae pass the pieces of food into the mouth. The food travels down the short esophagus into the stomach. The digestive gland produces digestive substances and from which the absorption of nutrients occurs. The green glands (also called antennal glands because they have ducts which exit near the base of the second antennae) function in excretion and osmoregulation. Undigested material passes into the intestine. The intestine is attached to the lobed stomach. The undigested material is exiled from the anus.Respiratory SystemThe gills are feather-like structures found underneath the carapace and attached to the chelipeds and walking legs. There is a constant flow of blood to the gills releases carbon dioxide and picks up oxygen.


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