Describe Planctosphaeroida
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Planctosphaeroida is a class of order Pterobranchia . Pterobranchia is a order of subphylum Hemichordata. The animals belonging to the class Planctosphaeroida are marine animals. Planctosphaeroida is a class which is represented by few,small,rounded, transperent and pelagic larvae , supposed to be specialized tornara of some unknown hemichordate termed Planctosphaera pelagica. The larval body is covered by extensively branched ciliary bands and its elementary canal is L-shaped.
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