Subclass Calcaronea Larva called amphiblastula (oval in shape with front half of flagellated cells, rear half without flagellated cells); flagella of choanocytes arise directly from nucleus; spicules 3-rayed, with one ray characteristically longer than other two; water-current system ascon, sycon, or leucon type; Leucosolenia, Scypha (formerly…
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