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Tardigrade anatomy [3]. Tardigrades have a short plump body with four pairs of hollow unjointed legs. Most range from 0.1 to 0.5 mm (0.004 to 0.02 in) in length, although the largest species may reach 1.3 mm (0.051 in).
Panarthropoda is a proposed animal clade containing the extant phyla Arthropoda, Tardigrada (water bears) and Onychophora (velvet worms). [3] Panarthropods also include extinct marine legged worms known as lobopodians ("Lobopodia"), a paraphyletic group where the last common ancestor and basal members of each extant panarthropod phylum are thought to have risen.
Tardigrades are known to exist in almost every biome on the earth. There are terrestrial species, marine species, and even fresh water species have been found. [4] The eight currently recognized species in the genus Bertolanius Özdikmen have a wide distribution ranging from colder arctic areas, including Norway and Sweden, to more temperate regions like the Mediterranean. [2]
The type specimen Rahm used as the basis of his description has either been lost [12] or it was never preserved in the first place, which Grothman et al. (2017) suggest is consistent with the lax taxonomic standards of the 1930s. [11]
Eutardigrada are a class of tardigrades (Tardigrada) without lateral appendages. Primarily freshwater bound, some species have secondarily gained the ability to live in marine environments . By cryptobiosis many species are able to live temporarily in very dry environments. More than 700 species have been described.
Milnesium tardigradum is a cosmopolitan species of tardigrade that can be found in a diverse range of environments. [1] It has also been found in the sea around Antarctica . [ 2 ] M. tardigradum was described by Louis Michel François Doyère in 1840.
Multipseudechiniscus raneyi is a species of tardigrade. It is the only species of Multipseudechiniscus, a genus within the family Echiniscidae. [1] The species was first described as Pseudechiniscus raneyi by Albert A. Grigarick, Franc Mihelčič & Robert O. Schuster in 1964. [2] It was placed in the new genus Multipseudechiniscus in 2011. [2]
The Ecdysozoa include the following phyla: Arthropoda, Onychophora, Tardigrada, Kinorhyncha, Priapulida, Loricifera, Nematoda, and Nematomorpha. A few other groups, such as the gastrotrichs, have been considered possible members but lack the main characters of the group, and are now placed elsewhere.