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Compare and contrast the reproductive cycles of the Class Anthozoa and Class Hydrozoa.

Compare and contrast the reproductive cycles of the Class Anthozoa and Class Hydrozoa.

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Unlike other cnidarians, anthozoans do not have a medusa stage in their development. Anthozoans remain polypoid throughout their lives.

Their life cycle starts from gametes. Both types of gametes are produced by polyp. These gametes fuse to give rise to free-swimming planula larva. The larva settles on a suitable substratum and develops into a sessile polyp which again starts producing gametes to begin a new life cycle.

In hydrozoans, both polyp and medically forms occur with polyp being dominant. polyps in each colony are either male or female. Medusa are formed from polyps through the vegetative budding. These medusa which are either males or females mature and spawn, releasing gametes. These gametes fuse to form zygote which develops into free-swimming planula larvae . The larvae settles on substratum and develops into polyp.

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