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The annelids (Annelida, from Latin anellus, "little ring"), also known as the ringed worms or segmented worms, are a large phylum, with over 22,000 extant species including ragworms, earthworms, and leeches.The species exist in and have adapted to various ecologies – some in marine environments as distinct as tidal zones and hydrothermal vents, others in fresh water, and yet others in mo...


Segmented worms (Annelida) are a group of invertebrates that includes about 12,000 species of earthworms, ragworms, and leeches. Segmented worms live in marine habitats such as the intertidal zone and near hydrothermal vents. Segmented worms also inhabit freshwater aquatic habitats as well as moist terrestrial habitats such as forest floors.


Leech classification is based on the presence or absence of setae and the nature of the mouth, proboscis (feeding organ), jaws, suckers, eyes, and reproductive system. Annotated classification. The following classification incorporates the views of several authorities. Phylum Annelida (segmented worms)


Segmented worms are any of the species of worms belonging to the taxonomic phylum Annelida.They are best known for the segments that divide their body externally by shallow ring-like constrictions, and are separated internally in many species by septa.


Worms are invertebrates with long, soft bodies and no hard skeleton. Their shapes are varied, and they range in size from microscopic to 75 feet in length. Scientists have classified worms into more than 15 phyla. The phylum Annelida contains the segmented worms. Annelida is further divided into three subclasses: ...


The seven categories of biological taxonomy are Kingdom, Phylum, Class, Order, Family, Genus and Species. All living organisms belong to specific groups within these categories, most of which have already been established, and earthworms are no exception. You might not anticipate, however, just how many different ...


PHYLUM ANNELIDA (SEGMENTED WORMS) • 12,000 species are known. • They live in many different habitats (ocean, fresh water, damp soils). TYPES Oligochaeta - Earthworms. Hirudinea - Leeches. Polychaeta - Marine worms, clam worms, etc. SYMMETRY Bilateral


Setae help the worms move. Each segment contains parts of the organism's excretory, circulatory, reproductive, and nervous system! The head and the rear of the body is not segmented. In One End and Out the Other The digestive system of species in this phylum runs the length of the body.


The Annelida phylum consists of the segmented worms. They lack a backbone and have bodies divided up into many segments. This phylum includes earthworms, leeches, and feather duster worms. Some species are terrestrial, while others are found in marine environments. Animals in this phylum have segmented bodies.


Disclaimer: The Animal Diversity Web is an educational resource written largely by and for college students.ADW doesn't cover all species in the world, nor does it include all the latest scientific information about organisms we describe. Though we edit our accounts for accuracy, we cannot guarantee all information in those accounts.