Science Quiz / Name that Cnidaria

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Can you name the Cnidaria ?

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CharacteristicClass
sea anemones and corals
square shaped body
medusa-produces sperm or eggs; fertilised eggs produce planula larvae which form polyps; polyps asexually produce medusa which then detach
box jellyfish
contains one species 'tailor-made' to attack and kill vertebrates
polyp only; no medusae
Portuguese-man-of-war
more sophisticated than most jellyfish species- swim better and 8 of 24 eyes function extremely well (have lense and retina)
hydroids
CharacteristicClass
contains stony, octocorals, and soft... stony secrete a cup of calcium carbonate
colonies form by budding rather than by detaching
continous gastrovascular cavity among members of the colony
jellyfish (general, other than box)
changes in direction are controlled by CaCo3 granules in the rhopalium
reproduces via a sexually dispersive medusa, solitary or colonial asexual polyp
swim by rhythmical contractions of the bell; pulsations controlled by marginal bodies that have 'pacemaker' cells
feed by swimming to the surface and drifting down, trapping prey with nematocysts

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Created Jun 14, 2010ReportNominate

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