OESOPHAGUS STOMACH
ECHINODERMS
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Ophiuroidea
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Echinoidea
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Holothuroidea
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Crinoidea.
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Detailed explanation-1: -sea lily, any crinoid marine invertebrate animal (class Crinoidea, phylum Echinodermata) in which the adult is fixed to the sea bottom by a stalk.
Detailed explanation-2: -Crinoids that are attached to the sea bottom by a stalk in their adult form are commonly called sea lilies, while the unstalked forms are called feather stars or comatulids, which are members of the largest crinoid order, Comatulida.
Detailed explanation-3: -Sea lilies and feather stars are examples of Crinoidea.
Detailed explanation-4: -Class Crinoidea Sea lilies are sessile organisms attached to the substrate by a flexible stalk (Figs. 3.96 A and B). The digestive organs are in a bud at the top of the stalk called the calyx. The arms of the crinoid extend out from the calyx.