Euthycarcinoida

Euthycarcinoida
Temporal range: Cambrian–Middle Triassic
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
(unranked): Euthycarcinoida

Euthycarcinoida is 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;[1] a Devonian example was added from the Rhynie chert in 2003,[2] and most recently a specimen has been found from the Cambrian.[3] 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.[3]

Euchelicerata



Euthycarcinoida



Myriapoda



Crustacea


Hexapoda




The organisms appear to have become extinct in the Triassic mass extinction.[4]

References

  1. ^ K. J. McNamara & N. H. Trewin (1993). "A euthycarcinoid arthropod from the Silurian of Western Australia". Palaeontology 36: 319–335. 
  2. ^ Lyall I. Anderson & Nigel H. Trewin (2003). "An Early Devonian arthropod fauna from the Windyfield cherts, Aberdeenshire, Scotland". Palaeontology 46 (3): 467–509. doi:10.1111/1475-4983.00308. 
  3. ^ a b N. E. Vaccari, G. D. Edgecombe & C. Escudero (2004). "Cambrian origins and affinities of an enigmatic fossil group of arthropods". Nature 430 (6999): 554–557. doi:10.1038/nature02705. PMID 15282604. 
  4. ^ Ian Anderson (August 17, 1991). "Is Australian fossil the ancestor of all insects?". New Scientist 1782: 15. http://www.newscientist.com/article/mg13117822.800-science-is-australian-fossil-the-ancestor-of-all-insects.html.