subphylum crustacea notes
TRANSCRIPT
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Subphylum Crustacea
Characterized by…..
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Subphylum Crustacea
Characterized by…..
1. Two pairs of antennae
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Subphylum Crustacea
Characterized by…..
1. Two pairs of antennae
2. Exoskeleton is made of chitin (like all
arthropods)
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Subphylum Crustacea
Characterized by…..
1. Two pairs of antennae
2. A layer of calcium carbonate in their exoskeleton that makes it thicker and stronger than in other Arthropods.
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Class Copepoda
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Class Brachyopoda
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Class: Cirripedia
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Class Malacostaca Characteristics
8 thoracic segments
6 abdominal segments
1 2 3 4 5 67
8
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There are three orders of the class Malacostraca….
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There are three orders of the class Malacostraca….
Amphiopoda – laterally flattened and aquatic
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There are three orders of the class Malacostraca….
Amphiopoda – laterally flattened and aquatic
Isopoda – dorsoventrally flattened and both terrestrial and aquatic.
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There are three orders of the class Malacostraca….
Amphiopoda – laterally flattened and aquatic
Isopoda – dorsoventrally flattened and both terrestrial and aquatic.
Decapoda – Five pairs of legs
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The muscle in the abdomen of a lobster is very white and soft and it’s the greatest tasting food in the whole world (fact).
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5th pair of legs of aquatic crabs are modified into “paddles” for swimming.
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The 5th pair of legs of terrestrial crabs are pointed like cleats.
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Male fiddler crabs have one greatly enlarged pincer. It is used for territorial displays.
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It is the crab’s legs that we generally eat. The muscle in the abdomen is too small to eat.
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Hermit Crabs use the gastropod shells for shelter.
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Their abdomen is long, soft, and muscular. They can reach into the whorls of a gastropod shell to hold themselves in.
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Their abdomen is long, soft, and muscular. They can reach into the whorls of a gastropod shell to hold themselves in.
Their 3 back pairs of legs are short and modified to help hold onto the shell as well.
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Most of us think of this when we think of shrimp.
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This is what a shrimp looks like before it is prepared to eat. Only the abdomen is eaten. The exoskeleton is also peeled away.
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Exoskeleton
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Exoskeleton
Muscles in the abdomen are “meaty” and sweet and scrumptious!
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