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