Question

Differences between echinodermata and arthropoda

Answer 1

Echinoderms: 5-rayed symmetry, mostly radial. Most possess a through gut with an anus. Highly variable body shape, no head. Open circulatory system, though poorly defined. No excretory organs. Live in marine environments. 

Arthropods: Live in every possible habitat. Jointed external skeleton. Pairs of jointed appendages. Bilateral symmetry. 

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Answer 2

Echinoderms : 
1) Marine 
2) Adults are radially symmetrical but larvae are bilaterally symmetrical
3) Respiration through dermal bronchiae, tube feet, respiratory tree or bursae.
4) Circulation by water vascular system(open type)
5) Complete digestive system
6) Specialized excretory organ absent.
7) Brain is absent.
8) Unisexual , without sexual dimorphism , external fertilization and always indirect development.

Arthropoda :
1) All habitats ( almost all )
2) Bilateral symmetry
3) Respiration by general body surface, gills, trachea or book lungs
4) Blood vascular system (open type)
5) Complete digestive system ( extracellular inside the digestive tract)
6) Excretion through malpighian tubules, green gland, coxal gland
7) Nervous system is made up of nerve ring and double, ventral and solid nerve chord.
8) Mostly dioecious. Fertilization is usually internal.

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