Page 93 - Primary Six Notes
P. 93
Uses of crustaceans
They are eaten as food by man.
Some are used as baits in fishing industry.
ARACHNIDS
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These are arthropods with four pairs
of legs and their bodies are divided into
two main body parts. (cephalothorax and abdo-
men)
Examples of arachnids
1. Spiders
They have special organ at the end of their abdomen called
spinnerets for spinning their webs.
They breathe through lung books
They use their webs for movement, building their nets,
trapping their prey and finding their way back.
They reproduce by laying eggs.
Reasons why spiders are not classified as insects.
1. They have two main body parts instead of three
2. Spiders have four pairs of jointed legs instead of three.
3. Spiders use lung books for breathing while insects use
spiracles.
