Captail Worms - Planet Ectora

a variety of cocoons

Captail worms are partially segmented worms whose tails end in ornately designed cocoon-like structures. The males wave these structures around high above the seafloor in the hopes of catching the attention of females, which lack the structure. A receptive female will take a cocoon and deposit her eggs in it as the male fertilizes them. The male will then close the cocoon and bury it where the young can develop in safety.

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Written by Daniel Noe, WayOutLife.com