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The annelids (/ ˈænəlɪdz /), also known as the segmented worms, comprise a large phylum called Annelida (/ əˈnɛlɪdə /; from Latin anellus 'little ring'). [ 3 ][ a ] It contains over 22,000 extant species, including ragworms, earthworms, and leeches. The species exist in and have adapted to various ecologies – some in marine ...
Lumbriculus variegatus, also known as the blackworm or California blackworm or Australian Blackworm, is a species of worm inhabiting North America Europe and Australia. It lives in shallow-water marshes, ponds, and swamps, feeding on microorganisms and organic material. The maximum length of a specimen is 10 cm (3.9 in).
Cyclotella is a genus of diatoms often found in oligotrophic environments, both marine and fresh water. It is in the family Stephanodiscaceae and the order Thalassiosirales. [ 1 ] The genus was first discovered in the mid-1800s and since then has become an umbrella genus for over 100 different species, the most well-studied and the best known ...
The Turbellaria are one of the traditional sub-divisions of the phylum Platyhelminthes (flatworms), and include all the sub-groups that are not exclusively parasitic.There are about 4,500 species, which range from 1 mm (0.039 in) to large freshwater forms more than 500 mm (20 in) long [3] or terrestrial species like Bipalium kewense which can reach 600 mm (24 in) in length.
Roundworms are typically microscopic, and occur in nearly every environment where there is water. [45] A number are important parasites. [46] Smaller phyla related to them are the Kinorhyncha, Priapulida, and Loricifera. These groups have a reduced coelom, called a pseudocoelom. Other invertebrates include the Nemertea or ribbon worms, and the ...
Earthworm head. Lumbricus terrestris is relatively large, pinkish to reddish-brown in colour, generally 110–200 millimetres (4.3–7.9 in) in length and about 7–10 millimetres (0.28–0.39 in) in diameter. It has around 120–170 segments, often 135–150. The body is cylindrical in the cross section, except for the broad, flattened ...
Clam worms are an important food source for bottom-feeding fish and crustaceans, though they also feed on different species of aquatic plants such as algae and diatoms. [6] By feeding on organic matter and types of waste and debris that is in the surrounding water the worm is commonly classified as a deposit feeder, more specifically omnivorous ...
Lemnoideae is a subfamily of flowering aquatic plants, known as duckweeds, water lentils, or water lenses. They float on or just beneath the surface of still or slow-moving bodies of fresh water and wetlands. Also known as bayroot, they arose from within the arum or aroid family (Araceae), [ 1 ] so often are classified as the subfamily ...