Jellyfish the adult medusa o the moon jellyfish Aurelia auritta. The moon jellyfish has global distribution and can survive a wide range of sea temperatures. Its sting causes an itchy rash. Diameter 10 inches (25 cm).
Common name: jellyfish (sea jellies), Medusozoa
Class: scyphozoan and cubozoa
Phylum: cnidaria
Lifespan: 6 to 12 months
Number of species: about 200
Size: mature medusa measure 0.5 (13 mm) to 6.5 ft (2 m) in diameter
Key features: in most species the predominant is a saucer bell or helmet-shaped medusa with fringe of tentacles around the edge or elaborate arms trailing from mouth in center of underside
Habits: most swim freely in open seas by means of pulsating bell; may migrate vertically to feed in shallower water at night
Breeding: medusa shed gametes via mouth; fertilization takes place in the water; embryos develop via 2 larval stages; the swimming planula larva develop into fixed polyplke scyphistoma larva develop into fixed polyplike scyphistoma larva, from which miniature medusae are produced asexually
Diet: a wide variety of invertebrate prey and some fish killed by stinging cells on tentacles or oral arms
Habitat: marine. Mostly open seas, occasionally bottom dwellers
Distribution: Worldwide
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Jellyfish Insect Animal
