An adult swimming cnidarian is called a medusa.
POLYP
MedusaMedusa
Medusa body form. Medusa-Umbrella shaped, tentacles hanging down. Swim about.
Jellyfish reproduction involves several different stages. In the adult, or medusa, stage of a jellyfish, they can reproduce sexually by releasing sperm and eggs into the water, forming a planula. In this larval stage of jellyfish life, the planula hooks on to the bottom of a smooth rock or other structure and grows into another stage of jellyfish life, the polyp--which resembles a miniature sea anemone. During this stage, which can last for several months or years, asexual reproduction occurs. The polyps clone themselves and bud, or strobilate, into another stage of jellyfish life, called ephyra. It is this form that grows into the adult medusa jellyfish.
Collective nouns for jellyfish are:a bloom of jellyfish (When jellyfish are spawned from their polyps they form what is called a "bloom".)a brood of jellyfisha fluther of jellyfisha smack of jellyfisha smuck of jellyfisha smuth of jellyfisha stuck of jellyfisha swarm of jellyfishA fluther or a smuth of jellyfish.A group of jellyfish is called a smack of jellyfish.
It starts as a sessile polyp like creature and then buds to form motile medusoid adults.
Jellyfish go through two life history stages throughout their lifetime, the first form is called a polypoid and the second is the jellyfish.
Strobilation
it is called adolescence
The main difference between jellyfish and sea anemone are their shapes. Jellyfish are a free-floating medusa shape while anemone are a polyp that remain anchored to the sea floor or rocks or coral. Both of these species feed by pulling prey into their mouth with stinging tentacles.
strobilation. c for Plato
It is called the Medusa or the jellyfish. it has no blood, no bones, and no Brain and yet it is a living animal.