Parapodia

Definition

Parapodia are paired, fleshy appendages found on each segment of polychaete annelids. They serve in locomotion and can also function in respiration and sensory perception.

5 Must Know Facts For Your Next Test

1. Parapodia are characteristic features of polychaete annelids, which are segmented worms belonging to the class Polychaeta.
2. Each parapodium typically has two lobes: a dorsal notopodium and a ventral neuropodium.
3. Parapodia contain numerous chaetae or setae, which are bristle-like structures that aid in movement.
4. In some species, parapodia can be highly vascularized to assist with gas exchange (respiration).
5. Parapodia vary widely in form and function depending on the ecological niche of the annelid species.

Review Questions

Related terms

Polychaeta:

A class of annelid worms characterized by having many bristles (chaetae) and distinct head regions

Chaetae: Bristle-like structures found on parapodia that assist with locomotion and anchorage

Annelida:

A phylum of segmented worms which includes earthworms, leeches, and polychaetes