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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.
Phylum Arthopoda. The phylum Arthropoda is the largest animal phylum. It contains all the insects, crabs, lobsters, spiders, and scorpions. It is believed there are more than one million types of insects alone on the planet, with many of them yet undiscovered.General characteristics of arthropods include jointed legs and an exoskeleton.eff is a Biology teacher and has a Doctorate in Educational Leadership. This lesson will describe the characteristics of the term 'phylum.' It will show how it relates to other taxonomic classifications, as well as describing some of the major phyla used to place living things into groups.