Categorize the following item into one of the 7 animal categories (mammal, amphibian, bird, fish, reptile, insect, arachnid):
Earthworm
Earthworms are not part of the 7 animal categories you have provided. An earthworm actually belongs to the taxonomic phylum Annelida making it an annelid.
Complete the following task based on the instruction and optional input provided.### Instruction:
Categorize the following item into one of the 7 animal categories (mammal, amphibian, bird, fish, reptile, insect, arachnid):

### Input:
Earthworm

### Output:
Earthworms are not part of the 7 animal categories you have provided. An earthworm actually belongs to the taxonomic phylum Annelida making it an annelid.