- No single feature distinguishes Annelids from other invertebrate phyla
- Their bodies are long, withsegments that are divided externally by shallow ring-like constrictions called annuli and internally by septa
- Annelid's are able to live in many different types of terrains
- They have both female and male reproductive systems
- They are able to regenerate parts of their bodies if they get cut off
- Some are even known to have been able to regrow their head after it was cut off
- It is often unknown which side of the earthworm is their head and which side is the anus
- Their bodies are covered by a outer covering (cuticle) that does not contain cells but is secreted by cells in the skin underneath, is made of tough but flexible collagen and does not molt
- They often do not go above ground in fear of getting eaten
- Despite there being so many different kinds of Annelids they all like to live in moist areas