Describe the major structural differences between the Arachnida, Crustacea, Myriapoda and Insecta. Use diagrams if this...

Describe the major structural differences between the Arachnida, Crustacea, Myriapoda and Insecta. Use diagrams if this assists you to answer the question.

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characters	Insecta	Arachnids	Crustacean	Myriapoda
Body region and segmentation	Body segmented into head, thorax, and abdomen	Body segmented opisthosoma and prosoma	the body is segmented into head, cephalothorax, and thorax.	Have two regions head and /trunk and is well segmented
Length	Depends on the insect to insect	Are less than 5 cm	Are larger than the arachnids	Mostly smaller
Antennae	Have a pair of antennae	No antennae	Two pair of antennae	One pair or none
Appendages	Have six legs or one or two pair of appendages	Have 8 appendages	Have 10 or more legs	Have one or two pairs of appendages per segment.
Exoskeleton	made of proteins (sclerotin) and chitin and is interwoven form flexible structure	Made up of outer wax containing outer thin epicuticleans and inner a thicker endocuticle	Made of protein chitin and calcium and is made up of separate plate	thick chitinous cuticle exoskeleton

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