Spiders, Arthropods & Mollusks

Hexapoda is in another collection:

Subphylum Hexapoda, including Insects / Insecta are organized into other Collections & Sets in this site.

This particular collection contains several phyla, sub-phyla, classes, etc.

An arthropod (Phylum Arthropoda) is an invertebrate animal having an exoskeleton, a segmented body, and jointed appendages.

Arthropods include the insects, arachnids, crustaceans, and others. Hexapods, including insects, are not included in this collection.

A Mollusk (Phylum Mollusca) is an invertebrate animal that includes snails, slugs, mussels, and octopuses. They have a soft, unsegmented body and live in aquatic or damp habitats, and most have an external calcareous shell.