Phylum Annelida of which there are three classes: Oligochaeta, Polychaeta, and Hirudinea.
Polychaete includes marine worms, crustaceans include crabs, lobsters, shrimps etc.
The three classes of Phylum Annelida are Polychaeta, Oligochaeta, and Hirudinea. Polychaeta are marine worms with bristles called chaetae, Oligochaeta include earthworms with few chaetae, and Hirudinea are leeches that are mostly freshwater and have suckers for attachment.
Marine worms belong to different taxonomic groups, so their scientific names vary. For example, marine polychaete worms are part of the class Polychaeta, while marine flatworms belong to the class Turbellaria. It's important to specify the type of marine worm to accurately determine its scientific name.
The animals called, bristle worms, are annelids of the class: Polychaeta. Subclasses are Palpata and Scolecide. There are in excess of 10,000 species of Polychaeta. Representatives may be found in any of the world's oceans including the Challenger Deep trench. Unfortunately they are often the unwelcome inhabitants of many salt water aquariums as well. A very detailed and complete description would be needed in order to classify a particular worm as to genus and species.
Phylum Annelida, segmented worms Taxonomy of annelids may not be universally agreed upon. However, often 2 classes are proposed: Class Polychaeta Class Clitellata Clitellata is further subdivided into 2 subclasses, Subclass Oligochaeta (earthworms) and Subclass Hirudinea (leeches).
bristleworm
The genus of Annelida is the phylum level classification for segmented worms, which include earthworms, leeches, and marine bristle worms.
The three classes of annelids are Polychaeta (marine worms with bristle-like structures called chaetae), Oligochaeta (terrestrial and freshwater worms like earthworms), and Hirudinea (leeches, which are typically found in freshwater environments).
An example of Polychaeta is the sandworm, also known as a lugworm. These segmented marine worms are commonly found in sandy coastal areas and play a key role in marine ecosystems, as they are important decomposers.
Worms breath through their body surface; some of them, like polychaeta have also branchial appendages.
Tubeworms belong to the phylum Annelida, which includes segmented worms. They are specifically classified in the class Polychaeta, which comprises marine worms known for their tube-dwelling lifestyle.