Subphylum Crustacea

Characterized by…..

Subphylum Crustacea

Characterized by…..

1. Two pairs of antennae

Subphylum Crustacea

Characterized by…..

1. Two pairs of antennae

2. Exoskeleton is made of chitin (like all

arthropods)

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.

12

Class Copepoda

Class Brachyopoda

Class: Cirripedia

Class Malacostaca Characteristics

8 thoracic segments

6 abdominal segments

1 2 3 4 5 67

8

There are three orders of the class Malacostraca….

There are three orders of the class Malacostraca….

Amphiopoda – laterally flattened and aquatic

There are three orders of the class Malacostraca….

Amphiopoda – laterally flattened and aquatic

Isopoda – dorsoventrally flattened and both terrestrial and aquatic.

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

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).

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

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

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

http://upload.wikimedia.org/wikipedia/commons/3/3e/Blue_crab_on_market_in_Piraeus_-_Callinectes_sapidus_Rathbun_20020819-317.jpg

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

Hermit Crabs use the gastropod shells for shelter.

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

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.

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

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

Exoskeleton

Exoskeleton

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