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Caenorhabditis elegans (/ ˌ s iː n oʊ r æ b ˈ d aɪ t ə s ˈ ɛ l ə ɡ æ n s / [6]) is a free-living transparent nematode about 1 mm in length that lives in temperate soil environments. [7] It is the type species of its genus. [8] The name is a blend of the Greek caeno-(recent), rhabditis (rod-like) [9] and Latin elegans (elegant).
The roundworm Caenorhabditis elegans is a free-living, transparent nematode, about 1 mm in length, [6] that lives in temperate soil environments. It is the type species of its genus. [7] An adult Caenorhabditis elegans worm. C. elegans has one of the simplest nervous systems of any organism - its hermaphrodite type possesses only 302 neurons.
Chaetogaster is a genus belonging to the segmented worms . It is classified in the family Naididae (subfamily Naidinae) in the order Oligochaeta. These are ca. 2–25 mm long transparent worms that are very common in fresh water and often form chains of individuals through asexual multiplication.
Aeolosoma is a genus of minute annelid worms, variously attributed either to oligochaetes or polychaetes. [2] Unlike most polychaetes, they reside in freshwater environments in various parts of the world. Aeolosoma are transparent worms, very thin and of the length of 1.5–2 mm. [3] They usually reproduce asexually. [4]
Most chaetognaths are transparent and are torpedo shaped, but some deep-sea species are orange. They range in size from 2 to 120 millimetres (0.1 to 4.7 in). Chaetognaths were first recorded by the Dutch naturalist Martinus Slabber in 1775. [3] As of 2021, biologists recognize 133 modern species assigned to over 26 genera and eight families. [3]
The majority of aquatic oligochaetes are small, slender worms, whose organs can be seen through the transparent body wall. They burrow into the sediment or live among the vegetation mostly in shallow, freshwater environments. Some are transitional between terrestrial and aquatic habitats, inhabiting swamps, mud or the borders of water bodies.
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.
Most gnathostomulids measure 0.5 to 1 millimetre (0.02 to 0.04 in) in length. They are often slender to thread-like worms, with a generally transparent body. In many Bursovaginoidea, one of the major group of gnathostomulids, the neck region is slightly narrower than the rest of the body, giving them a distinct head. [2]