Biology 11Mrs. Knowles

Chapter 28: Arthropods!

Characteristics of all arthropods

1)

2)

3)

4)

5)

6) jointed appendages:

Exoskeletons and molting

Exoskeleton is made of:

Biology 11Mrs. Knowles

Functions of exoskeleton:

Disadvantages of exoskeletons:

1)

2)

molting

Segmentation

Most common options:

Option 1:

Biology 11Mrs. Knowles

Option 2:

Cephalothorax

Gas exchange

Need for efficient gas exchange:

1) Gills

Biology 11Mrs. Knowles

2) Tracheal tubes

-spiracles

3) Book lungs

Senses

1) Antennae

Biology 11Mrs. Knowles

Pheromones

2) Eyes: simple and compound

Nervous system

Biology 11Mrs. Knowles

Other body systems

A. Circulatory system

B. Digestive system

Mandibles

C. Excretion

Malpighian tubules

Biology 11Mrs. Knowles

D. Muscles

Reproduction

A. Fertilization (in most):

B. Barnacles:

C. Parthenogenesis:

Biology 11Mrs. Knowles

Classes within the phylum Arthropoda

1. Class Arachnida

Examples:

Characteristics:

Chelicerae

Pedipalps

Spinnerets

Biology 11Mrs. Knowles

2. Class Crustacea

Examples:

Characteristics:

3. Class Chilopoda

Biology 11Mrs. Knowles

Examples

Characteristics

4. Class Merostomata

Examples

Characteristics

5. Class Insecta

Biology 11Mrs. Knowles

Examples

Characteristics

Insect reproduction:

Biology 11Mrs. Knowles

Metamorphosis

a) Complete

Egg

Larva

Pupa

Adult

b) Incomplete

Biology 11Mrs. Knowles

Egg

Nymph

Adult

Origins of Arthropods