Assertion: sponge's feature | /r/HasProperty | flagellated opinacocytes
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Source sentences:
text: The Homoscleromorpha comprise a small group of marine Porifera with unique features: flagellated opinacocytes and a basement membrane lining both choanoderm and pinacoderm, oval to spherical choanocyte chambers with large choanocytes, and a viviparous cinctoblastula larva.