Protonephridia are primarily associated with the class Turbellaria, which includes free-living flatworms, rather than annelids. However, in the context of annelids, the class Oligochaeta (such as earthworms) and the class Hirudinea (leeches) have a different excretory system involving nephridia, which are more complex than protonephridia. In summary, protonephridia are not characteristic of annelids but rather of certain other invertebrate groups.
Phylum Annelida -- Class Oligochaeta
Annelids belong to the class Polychaeta, which includes marine worms that have bristle-like structures called setae along their body segments. Other classes of annelids include Clitellata, which includes earthworms and leeches.
Leeches are the class of annelids that has suckers. They use these to suck the blood out of humans and animals in order for them to survive.
Protonephridia are found in flatworms, such as planarians. These structures are responsible for excreting waste and regulating osmotic balance in these organisms.
Annelids exhibit bilateral symmetry.
flame cell
Yes, the queen ant in an ant colony lays eggs.
Yes, Platyhelminths, commonly known as flatworms, possess protonephridia. These are simple excretory structures that function in osmoregulation and waste removal. Protonephridia consist of flame cells that create a current to help expel waste products and excess water from the body. This system is crucial for maintaining the internal environment of these organisms, especially in freshwater habitats.
annelids
Are annelids vertebrate
protonephridia, metanephridia... Gills?
earthworms, polychaete worms, and leeches.