First slide

Classification of Animals

Question

Consider the following features.
a. Open circulatory system
b. Metamerism
c. True coelom
Select the correct set of animals that posses all the above features.

Moderate

A

Limulus, Locusta, Aedes
B

Nereis, Pheretima, Hirudinaria
C

Periplaneta, Pila, Pinctada
D

Apis, Bombyx, Aplysia

Solution

Arthropods are true coelomates that exhibit open circulatory system and metamerism.
Locusta, Limulus, Aedes, Periplaneta, Bombyx, Apis are arthropods.
Nereis, Pheretima, Hirudinaria are annelids with true coelom and metamerism. But have a closed circulatory system.
Pila, Pinctada, Aplysia are molluscs which are unsegmented although have a true coelom and open circulatory system.

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