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In what ways is the phylum Annelidia more advanced then the phylum Cnidaria?
Wiki User
∙ 14y ago
Cnidaria are diploblastic, only consisting of 2 body layers, no cephalisation and limited nervous system and musculature. Annelida however, is triploblastic (with 3 body layers). Members are also coelomate with a body cavity for organs. Bilateral symmetry allows for mouth AND anus to differentiate. With a body cavity there is need for greater circulation, nervous control and excretory apparatus. Musculature is quite good, for movement. There are many such characters that make Annelida more advanced. Annelida are also (in the case of their class Oligochaeta) more terrestrial, whereas Cnidaria are entirely aquatic.
Wiki User
∙ 14y ago
Annelids have a more complex body structure with segmented bodies and a true coelom, which provides more efficient movement and organ systems compared to the simpler radial symmetry and centralized body cavity of cnidarians. Annelids also exhibit a wider range of specialized adaptations for various environments and lifestyles compared to cnidarians.
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