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Phylum: Mollusca Mollusca A major phylum of the animal kingdom comprising an extreme diversity of external body forms (oysters, clams, chitons, snails, slugs, squid, and oc â¦ topuses among others), all based on a remarkably uniform basic plan of structure and function.
Crabs are not arachnids; they are crustaceans. Arachnids are animals such as spiders. Arachnids, insects and crustaceans all belong to the family group arthropod. Arthropods are animals with exoskeletons, segmented bodies and jointed legs.They are the largest group of animals on Earth.Most crustaceans such as the crab are aquatic animals living in either marine or fresh water environments.rachnids, insects and crustaceans all belong to the family group arthropod. Arthropods are animals with exoskeletons, segmented bodies and jointed legs. They are the largest group of animals on Earth. Most crustaceans such as the crab are aquatic animals living in either marine or fresh water environments.