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Jellyfish Facts and Wallpapers

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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