Euthycarcinoid

Euthycarcinoid

taxobox
fossil_range=Cambrian - Middle Triassic (210Ma)
regnum=Animalia
phylum=ArthropodaThe Euthycarcinoids are a group of amphibious freshwater arthropods that until recently were only known from the Carboniferous onwards. A single Ordovician/Silurian individual was identified in the Tumblagooda sandstone in 1993;cite journal
author = McNamara, K.J.
coauthors = Trewin, N.H.
year = 1993
title = A euthycarcinoid arthropod from the Silurian of Western Australia
journal = Palaeontology
volume = 36
pages = 319–335] a Devonian example was added from the Rhynie chert in 2003,cite journal
author = Anderson, L.I.
coauthors = Trewin, N.H.
year = 2003
title = An Early Devonian arthropod fauna from the Windyfield cherts, Aberdeenshire, Scotland
journal = Palaeontology
volume = 46
issue = 3
pages = 467–509
doi = 10.1111/1475-4983.00308] and most recently a specimen has been found from the Cambrian.Vaccari NE, Edgecombe GD, Escudero C (2004) Cambrian origins and affinities of an enigmatic fossil group of arthropods. Nature 430: 554-557.] The organisms may have produced some varieties of "Protichnites", the earliest arthropod trackways on land.

By the latest phylogenies, the organisms represent stem-group myriapods.

The organisms appear to have become extinct in the Triassic mass extinction.cite journal|issue=1782 |journal= New Scientist magazine|title=Is Australian fossil the ancestor of all insects?|author=Ian Anderson|date=17 August 1991|pages=15|url=http://www.newscientist.com/article/mg13117822.800-science-is-australian-fossil-the-ancestor-of-all-insects.html]

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