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The Life Cycle of a Jellyfish

The life cycle of a jellyfish.

Beth X

on 5 June 2013

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Transcript of The Life Cycle of a Jellyfish

By Bethany X The
Life Cycle of a
Jellyfish Stage 1 - Birth The female and male jellyfish mate.
The female produces an egg.
The male gives it a sperm through
its mouth. The sperm,
which is a swimming cell,
fertilizes it and eventually
the eggs hatch. Stage 2 - Planula When the eggs develop enough,
they hatch and out comes one or more planula.
The planula is a tiny oval structure whose outer surface is covered in tiny hairs called cilia.
The cilia propel the jellyfish, which floats a few days at sea, then drops down onto
coral, attaches itself, and begins the next stage. Stage 3 - Polyp When the planula is settled
on a coral, it turns into a polyp.
The polyp doesn't move and it has a stalk and looks like a cylinder. The base is a disk and the top is a mouth with tentacles. The polyp grows and more polyps grow from its stem. When
all the polyps reach a specific
size they begin the next
stage. Stage 4 - Ephyra When the polyps are ready to transform, the stalk part of the polyps develop deep horizontal grooves. The grooves deepen until the polyp looks like a sack of saucers. The topmost groove grows fastest and eventually goes off as a tiny baby jellyfish called a ephyra. Stage 5 - Medusa The medusa is the adult form of a jellyfish.
It is the form of a jellyfish that is most recognized.
The medusa form consists of an umbrella-shaped body called a bell, a fringe of tentacles that hang from it and a mouth in the underside of the bell. Bibliography http://www.jcu.edu.au/stingers/biology%202lifecycle.htm


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http://animals.about.com/od/cnidarians/a/lifecyclejellyf.htm Box Jellyfish And when the medusa mates the cycle begins again...
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