| Parachela Temporal range: | |
|---|---|
 | |
| Hypsibius dujardini | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Tardigrada |
| Class: | Eutardigrada |
| Order: | Parachela |
| Superfamilies and families | |
See text | |
Parachela is an order of tardigrades in the class Eutardigrada. Members of this order have existed for at least 72 million years, including the present. The oldest known species is Beorn leggi . [2]
The order includes the following superfamilies and families:
Lobopodians are members of the informal group Lobopodia, or the formally erected phylum Lobopoda Cavalier-Smith (1998). They are panarthropods with stubby legs called lobopods, a term which may also be used as a common name of this group as well. While the definition of lobopodians may differ between literatures, it usually refers to a group of soft-bodied, marine worm-like fossil panarthropods such as Aysheaia and Hallucigenia.
Heterotardigrades (Heterotardigrada) is a class that includes tardigrades that have cephalic appendages and legs with four separate but similar digits or claws on each. 444 species have been described.
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 (Halobiotus). By cryptobiosis many species are able to live temporarily in very dry environments. More than 700 species have been described.
Aysheaia is an extinct genus of soft-bodied lobopodian, known from the Middle Cambrian Burgess Shale of British Columbia, Canada
Ecdysozoa is a group of protostome animals, including Arthropoda, Nematoda, and several smaller phyla. The grouping of these animal phyla into a single clade was first proposed by Eernisse et al. (1992) based on a phylogenetic analysis of 141 morphological characters of ultrastructural and embryological phenotypes. This clade, that is, a group consisting of a common ancestor and all its descendants, was formally named by Aguinaldo et al. in 1997, based mainly on phylogenetic trees constructed using 18S ribosomal RNA genes.
Panarthropoda is a proposed animal clade containing the extant phyla Arthropoda, Tardigrada and Onychophora. Panarthropods also include extinct marine legged worms known as lobopodians ("Lobopodia"), a paraphyletic group where the last common ancestor and basal members (stem-group) of each extant panarthropod phylum are thought to have risen. However the term "Lobopodia" is sometimes expanded to include tardigrades and onychophorans as well.
Pyrrhocoroidea is a superfamily of true bugs in the infraorder Pentatomomorpha.
Tardigrades, known colloquially as water bears or moss piglets, are a phylum of eight-legged segmented micro-animals. They were first described by the German zoologist Johann August Ephraim Goeze in 1773, who called them Kleiner Wasserbär. In 1777, the Italian biologist Lazzaro Spallanzani named them Tardigrada, which means "slow steppers".
The Dexiarchia are a suborder of sea slugs, shell-less marine gastropod molluscs in the order Nudibranchia. This classification is based on the study by Schrödl et al., published in 2001, who recognized within this clade two clades Pseudoeuctenidiacea and Cladobranchia.
Ramazzottius is a genus of water bear or moss piglet, a tardigrade in the class Eutardigrada.
Zoologischer Anzeiger – A Journal of Comparative Zoology is a peer-reviewed scientific journal specialising in the field of comparative zoology. It is included in a number of bibliographic databases:
Paraprefica is an extinct genus of potoo from the middle Eocene. Its fossil remains have been found in the Messel pit at Messel, Germany.
The Scleronychophora or armoured lobopods are a group of lobopodians that bear a robust dorsal armature of paired plates.
Tactopoda or Arthropodoidea is a proposed clade of ecdysozoan animals that includes the phyla Tardigrada and Euarthropoda, supported by various morphological observations. The cladogram below shows the relationships implied by this hypothesis.
Beorn leggi is an extinct species of tardigrade and the first known fossil tardigrade, discovered c. 1940 and described in 1964 from Late Cretaceous amber from Manitoba, Canada. It is the only species in the genus Beorn, and family Beornidae. It is one of two fossil tardigrades known from the Cretaceous, the other being Milnesium swolenskyi from the Turonian New Jersey amber.
Ernstilla is a genus of sea sponges and is the only genus in the monotypic family Ernstillidae. It is represented by a single species Ernstilla lacunosa.
Milnesium swolenskyi is a species of tardigrade from the Cretaceous period. It, Beorn and Paradoryphoribius are the only known tardigrade genera in the fossil record. The type specimen AMNH NJ-796 was found in Turonian New Jersey amber, from about 93.9 to 89.8 million years ago (mya).
Richtersiidae is a family of tardigrades belonging to the order Parachela.
Paradoryphoribius is an extinct genus of tardigrades from the order Parachela. It is the third fossil tardigrade to be named, described in 2021 from Miocene Dominican amber from the Dominican Republic. The type, and currently only species, is P. chronocaribbeus. Paradoryphoribius is the first extinct tardigrade known from the Cenozoic and is also the first tardigrade known from the Miocene. It has a length of 539 microns.
Parachela may refer to:
Media related to Parachela at Wikimedia Commons
Data related to Parachela (tardigrade) at Wikispecies  | This tardigrade-related article is a stub. You can help Wikipedia by expanding it. |