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Published byMildred Russell Modified over 9 years ago
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Crayfish Lab Preview April 24, 2012
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Crayfish General Information: Phylum: Arthropods - means “jointed foot” Class: Crustaceans 2 Body Parts: Cephalothorax Abdomen Review: General Terms: Dorsal – top side Ventral – bottom side Anterior – front end Posterior – back end Anterior Ventral Dorsal Posterior Cephalothorax Abdomen
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Crayfish External Features: Antennae Cheliped Telson Segment Walking legs Compound Eye
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Crayfish Body Systems Circulatory System – How the blood circulates through the body. Dyed pink Heart - pumps blood. Arteries – transports blood into open spaces (open circ. System) Respiratory System Gills – breathe under water. Heart Dorsal Abdominal Artery Ventral Abdominal Artery Gills
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Crayfish Body Systems Continued Nervous System – Used to sense and feel things Brain – very difficult to see. Nerve Cord – only on ventral side of the crayfish Brain Nerve Cord
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Crayfish Body Systems Continued Reproductive System – Making more crayfish Male – letter A in picture Testis – make sperm Sperm Duct Male opening Swimmerets – moves sperm Female – letter B in picture Ovary – holds eggs Oviduct opening Swimmerets – moves eggs Testis Sperm Duct Swimmerets Ovary Oviduct opening
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Crayfish Body Systems Continued Digestive System – Taking in food and breaking it down. Mouth Esophagus Stomach - 2 interesting features Location Rows of teeth Intestine Anus Stomach Intestine Anus Mouth Esophagus
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Crayfish Body Systems Continued Excretory System – Gets rid of wastes. Anus – releases wastes. Anus
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