The document describes characteristics of crustaceans. It notes that crustaceans have two pairs of antennae and an exoskeleton made of chitin with some having a layer of calcium carbonate. It discusses the classes Copepoda, Brachyopoda, Cirripedia, and Malacostraca. Malacostraca have three orders: Amphipoda, Isopoda, and Decapoda. It provides details on hermit crabs, fiddler crabs, and shrimp anatomy and preparation for eating.

1. Subphylum Crustacea
Characterized by…..

2. Subphylum Crustacea
Characterized by…..
1. Two pairs of antennae

4. Subphylum Crustacea
Characterized by…..
1. Two pairs of antennae
2. Exoskeleton is made of chitin (like all
arthropods)

6. 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.

7. 1
2
Class Copepoda

8. Class Brachyopoda

9. Class: Cirripedia

10. Class Malacostaca
Characteristics
8 thoracic segments
6 abdominal segments
1 2 3 4
5 6
7
8

11. There are three orders of the class Malacostraca….

12. There are three orders of the class Malacostraca….
Amphiopoda – laterally flattened and aquatic

14. There are three orders of the class Malacostraca….
Amphiopoda – laterally flattened and aquatic
Isopoda – dorsoventrally flattened and both
terrestrial and
aquatic.

18. 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

22. 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).

23. 5th
pair of legs of aquatic crabs
are modified into “paddles” for
swimming.

25. The 5th
pair of legs of terrestrial
crabs are pointed like cleats.

26. Male fiddler crabs have one greatly
enlarged pincer. It is used for
territorial displays.

30. It is the crab’s legs that we generally eat. The
muscle in the abdomen is too small to eat.

33. Hermit Crabs
use the
gastropod shells
for shelter.

35. Their abdomen is
long, soft, and
muscular. They
can reach into the
whorls of a
gastropod shell to
hold themselves
in.

36. 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.

37. Most of us think of this when we think of shrimp.

38. This is what a shrimp looks like before it
is prepared to eat. Only the abdomen is
eaten. The exoskeleton is also peeled
away.

39. Exoskeleton

40. Exoskeleton
Muscles in the
abdomen are
“meaty” and
sweet and
scrumptious!