Science Quiz / Name that Cnidaria

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Can you name the Cnidaria ?

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jellyfish (general, other than box)
feed by swimming to the surface and drifting down, trapping prey with nematocysts
square shaped body
polyp only; no medusae
continous gastrovascular cavity among members of the colony
more sophisticated than most jellyfish species- swim better and 8 of 24 eyes function extremely well (have lense and retina)
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
colonies form by budding rather than by detaching
sea anemones and corals
contains one species 'tailor-made' to attack and kill vertebrates
medusa-produces sperm or eggs; fertilised eggs produce planula larvae which form polyps; polyps asexually produce medusa which then detach
contains stony, octocorals, and soft... stony secrete a cup of calcium carbonate
box jellyfish

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