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30 Cards in this Set
- Front
- Back
crayfish are in what phylum?
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anthropoda
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what class is the crayfish in?
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crustacea
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crayfish are what kind of eaters?
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master scavengers; they eat dead or living animals and plants, including fish, tadpoles, worms, insects,and plants.
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how long is a crayfish usually?
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5 inches or more
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what habitat do they live in?
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in freshwater, swamps or rivers. they make their homes by burrowing into muddy banks and bottoms.
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external anatomy
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dorsal surface and ventral surface
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dorsal surface
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cephalothorax, carapace, rostrum, stalked compound eye, antennules, and antennae
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ventral surface
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mouth, maxillipeds, cheliped, walking appendages
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cephalothorax
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in crayfish, the head and thorax are fused into a single part called a cephalothorax
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carapace
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the hard covering of the cephalothorax; it is v shaped
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rostrum
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the anterior end of the cephalothorax. looks like a helmet
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stalked compound eye
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one on each side of the rostrum
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antennules
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also at end of rostrum, these short appendages have small sacs at their base which contain the hearing and balance organs
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antennae
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these very long appendages at the end of the rostrum are sense organs for taste and touch
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mouth
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has 2 parts; mandibles and maxillae
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mandibles
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triangle shaped with little teeth on inner edges, 1 pair
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maxillae
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2 pairs. the larger pair moves water into the gill chamber. the smaller pair moves food into the mouth opening.
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maxillipeds
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3 pairs, increasing in size from front to rear. hold food and also function in the touch and taste senses
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cheliped
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look like giant pincers. these are used to grasp and tear food and for defense
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walking appendages
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legs with 7 joints in each one. can move forward, sideways, and backwards. 4 pairs of these
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how many segmants are in the abdomen?
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6
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swimmerets
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each segment has a pair; they are used to pick and clean debris and parasites off the crayfish
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telson
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central section of the tail
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uropod
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on either side of the telson
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respiratiory system
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composed of gills which are attached to legs takes oxygen from the water and passes it along to the blood
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digestive system
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1 month 2 esophagus 3 stomach 4 digestive glands 5 intestine and 6 anus
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gastric mill
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little teeth inside the stomach
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excretory stystem
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glands called green glands function in this capacity in the crayfish. they are located anterior to the esophagus and below the compound eye
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circulatory system
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1 heart 2 abdominal aorta 3 anterior dorsal aorta
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nervous system
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brain and ventral chord
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