|
Related Topics: |
Arthropods
What are they?
The Arthropod's form
the largest phylum in the animal kingdom including lobsters, crabs, spiders,
insects, millipedes. More than 80 percent of the animal kingdom are formed by
them, while they may seem to have no apparent connection.. They have a sort
of skeletal covering made by chitin - a sugar that's complex in structure (
if this was a site on chemistry I could go on and on and on of it's chemical
structure but it's not ). This is bound to protein. The nonliving skeleton (
exoskeleton ) is made by the epidermis below. The body is mostly in segments
and they have appendages which are mostly joined ( that's the meaning of Arthropoda
- joined feet ).
How do they live?
There are four sub phylums to the group :
The first one contains trilobites, the second the spiders and scorpions ( and mites and ticks ). The third consists of marine animals like lobsters, crabs etc. The fourth and last contains insects ( and bugs ). It also has centipides, millipides and some other stuff ( living stuff ), but some people say that millipides and centipides are of two diffrent catagories.
But since everything has to have an exception ( or life would be too simple without it ), there are some that don't seem to belong to any of the branches. They are found to be predecessors of some Arthropod that lack certain features of the regular arthropod's.
They have eyes that may be simple or compound, or even both.
