Why are you looking for an opening?
The famous animal the "Porifera", has 6 body openings.
mollusca(phlum)
The phylum Mollusca has a body part called a radula, which is a rasping organ used for feeding. Mollusks also have a mantle, which is a thin membrane that secretes the shell in many species.
The phylum for oysters is Mollusca.
There in the phylum Mollusca
Phylum Mollusca
Mollusca is a phylum, not a subphylum.
They are mollusks part of the mollusca group.
The phylum of a squid is Mollusca.
There are many animals that are not in the Mollusca phylum. Birds, starfish, butterflies, jellyfish, and worms are not part of the Mollusca phylum.
In the human body there is no "opening" that stores food.
An invertebrate that has a soft body and a shell is called exosceloton.