The key difference between arthropods and annelids is that the arthropods are a group of invertebrates that includes animals having a segmented body, an exoskeleton and paired appendages while annelids are another group of invertebrates that includes segmented worms possessing transverse rings.

What separates annelids from arthropods?

A distinguishing characteristic shared by annelids and arthropods is their body segmentation. At some point in development, segmented animals possess a body plan with repeating segments of identical or similar structures. Later in development, some segments may form more specialized structures.

How do arthropods differ from annelids and molluscs?

An arthropod is an invertebrate that has an exoskeleton, a segmented body, and jointed attachments called appendages, and an annelids have worm-like features. Molluscs have a soft, unsegmented body with bilateral symmetry.