what is crinoidea...............
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The Crinoids are a class of Echinoderms. They have two forms, the sea lilies, stalked forms attached to the sea floor, and the feather stars, which are free-living.
All crinoids are marine, and live both in shallow water and in depths as great as 6000 meters. The basic echinoderm pattern of fivefold symmetry can be recognized, but most crinoids have many more than five arms. Crinoids have a mouth on the top surface that is surrounded by feeding arms.
The crinoids have a long history. They were the first echinoderms to appear in the fossilrecord, and have kept their early structure throughout their long career. They were extremely common in the Palaeozoic, and some rocks from the Carboniferous consist almost entirely of fossil crinoids.
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here goes your anwer!!!
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The Crinoids are a class of Echinoderms. They have two forms, the sea lilies, stalked forms attached to the sea floor, and the feather stars, which are free-living.
All crinoids are marine, and live both in shallow water and in depths as great as 6000 meters. The basic echinoderm pattern of fivefold symmetry can be recognized, but most crinoids have many more than five arms. Crinoids have a mouth on the top surface that is surrounded by feeding arms.
The crinoids have a long history. They were the first echinoderms to appear in the fossilrecord, and have kept their early structure throughout their long career. They were extremely common in the Palaeozoic, and some rocks from the Carboniferous consist almost entirely of fossil crinoids.
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MrIntrovert27:
dear elaboraye it more . ur content is very less
elaborate*
okk thanks for your suggestion
like body has central disc which is attached to substratum
arms are branched
ambulacral grooves are present
done
spines and madreporite are absent
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crinoidea(Gk.Crinon=lily;eidos=form)
its a class of phylum echinodermata
body has central disc
arms are branched
ambulacral grooves are present
spines pedicellariae and madreporite are absent
they are commonly called feather stars or sea lillies
its a class of phylum echinodermata
body has central disc
arms are branched
ambulacral grooves are present
spines pedicellariae and madreporite are absent
they are commonly called feather stars or sea lillies
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