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As their name (which means "cube animals") suggests, cubozoans have a box-shaped medusa stage. Coastal scyphozoans, for example, often have a brief polyp stage during their life cycle, whereas those that live in the open ocean generally lack the polyp stage altogether. Most hydrozoans alternate between stages, whereas most scyphozoans and cubozoans spend the majority of their life cycles in the medusa stage. medusozoan anthozoan All cnidarians that produce a medusa are members of clade medusozoan, a group that includes the scyphozoans (jellies) and cubozoans (box jellies), along with the hydrozoans. "Larval stage crown of ciliated tentacles for feeding" and "adult stage crown of stinging tentacles for feeding" are incorrect because the lophophore is a crown of ciliated tentacles and the trochophore stage is a larval stage.Ĭ. "Crown of stinging tentacles for feeding larval stage" is incorrect because the lophophore is a crown of ciliated tentacles. "Crown of ciliated tentacles for feeding adult stage" is incorrect because the trochophore stage is a larval stage. This diversity in form is reflected by the number of phyla classified in the group: Lophotrochozoa includes 18 phyla, more than twice the number in any other clade of bilaterians, and includes the flatworms, rotifers, ectoprocts, brachiopods, molluscs, and annelids. Few other distinctive morphological features are widely shared within the group-in fact, the lophotrochozoans are the most diverse bilaterian clade in terms of body plan. Other members of the group have neither of these features. Some lophotrochozoans develop a structure called a lophophore, a crown of ciliated tentacles that functions in feeding, while others go through a distinctive stage called the trochophore larva. crown of ciliated tentacles for feeding larval stage The clade Lophotrochozoa was identified by molecular data its name comes from the features found in some of its members.
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