Earthworms belong to the phylum Annelida (ringworms). Note that these are not the only kind of worms; two other phyla are Platyhelminthes (flatworms) and Nematoda (roundworms), and they're all very different from each other. For comparison, another phylum-phylum difference is that between either of the worms and Chordata, being all vertebrates!
Oysters belong the the invertebrate group of mollusk.
They belong to the group of arachnids.
An earthworm is an invertebrate as it doesn't have an internal skeleton or a spine.
Crabs are Crustaceans.
It is a Mollusks
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mollusk, polycepodaIntelligent Invertebrate: The octopus - a cephalopod - is one of the largest, fastest and most intelligent of all invertebrates.This information was taken from "Animalplanet.com".
The octopus is an invertebrate animal (it has no backbone) and belong to the phylum (group) Mollusca. Its closest relatives are the various species of squid and cuttlefish.
A lionfish belongs in the fish group. Specifically, it is a type of ray-finned fish belonging to the family Scorpaenidae.
Centipedes are arthropods, belonging to the class Chilopoda. They are among the largest terrestrial invertebrate predators.
Crab classification: Phylum - Arthropoda Subphylum - Crustacea Class - Malacostraca Order - Decapoda
Leeches belong to the phylum Annelida (ringworms), like the common earthworm! They are very similar, they have the same bodyplan, rings and bristles.