Lophotrochozoa protostomes {mollusc}| (Mollusca) {mollusk} can have hard carbonate shells. Molluscs are second largest phylum: oyster, clam, octopus, squid, snail, slug, and giant squid. Land snails are molluscs with lungs. Squid seem to feel pain. Molluscs have ganglia groups, each controlling one activity, in ring around gut. Snails have simple eyes. Squid and octopus have compound eyes. Other organ systems are like those in arthropods.
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Date Modified: 2022.0224