Q.
Which of the following features are common for Nereis and Hirudinaria?
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a
Metamerism and nephridia
b
Parapodia and closed circulatory system
c
Dioecious condition and indirect development
d
Triploblastic condition and radial symmetry
answer is A.
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Detailed Solution
All annelids are metamerically segmented and have nephridia for excretion. Parapodia are absent in Hirudinaria. Nereis is dioecious while Hirudinaria is monoecious. Development is indirect in Nereis while it is direct in Hirudinaria. Both are triploblastic and bilaterally symmetrical.
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