Why are you looking for an opening?
The famous animal the "Porifera", has 6 body openings.
mollusca(phlum)
mollusca
== MOLLUSCA (Molle== soft body). ===
Phylum Mollusca
There in the phylum Mollusca
Mollusca is a phylum, not a subphylum.
Mollusca Dana in Ms
The phylum of a squid is Mollusca.
They are mollusks part of the mollusca group.
An animal that is not in the phylum Mollusca is a spider. Spiders belong to the phylum Arthropoda.
An invertebrate that has a soft body and a shell is called exosceloton.