Identify the phylum whose members have CHOANOCYTES (collar cells) lining the spongocoel.
AEchinodermata
BMollusca
CPorifera (sponges) — examples include Sycon, Spongilla, Euspongia
DCoelenterata
Answer & Solution
Correct answer: C. Porifera (sponges) — examples include Sycon, Spongilla, Euspongia
Choanocytes are unique to sponges (Porifera). Water enters via ostia → spongocoel → exits via osculum. Choanocytes line this canal system and aid in filter feeding. Digestion is intracellular.
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