Scientists aim to describe a single 'tree of life' that reflects the evolutionary relationships of living things. However, evolutionary relationships are a matter of ongoing discovery, and there are different opinions about how living things should be grouped and named. EOL reflects these differences by supporting several different scientific 'classifications'. Some species have been named more than once. Such duplicates are listed under synonyms. EOL also provides support for common names which may vary across regions as well as languages.

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Preferred marks the preferred classification for this taxon.

Recognized By Rank Classification
Species 2000 & ITIS Catalogue of Life: April 2013
view in classification
Order
Integrated Taxonomic Information System (ITIS)
view in classification
Order
Animal Diversity Web Descriptions Order
AskNature Order
BOLDS resource for higher-level taxa
BOLDS resource for higher-level taxa
BOLDS resource for species-level taxa Order
BioImages resource Order
BioImages resource Order
BioImages resource
BioKIDS Order
BioKIDS
Conabio Order
Conabio Order
EOL Group on Flickr Order
EOL Group on Flickr Order
EOL Group on Flickr Order
EOL Group on Flickr Order
EOLspecies
  • Artiodactyla
Fire Effects Information System (FEIS) - Animals Order
Harvard Museum of Natural History Africa Hall Order
IABIN resource Order
INBio resource Order
BioLib.cz Import Order
BioLib.cz Import
AnAge database Order
Library of Alexandria Order
Library of Alexandria Order
Library of Alexandria
MCZ resource Order
Mammalia Order
Mammals Resource Order
Natural History Museum Species of the day Order
NatureServe resource Order
North American Mammals Resource Order
Paleobiology Database
view in classification
Unranked clade
Photosynth Resource Order
SPIRE resource Order
Monthly ARKive text import Order
Taxonomic Hierarchy of COL-China 2012
view in classification
Order
The Biodiversity of Tamborine Mountain Order
The Field Museum Member's Night EOL Photo Scavenger Hunt 2010 Order
Tree of Life web project
  • Artiodactyla
Wikimedia Commons
  • Artiodactyla Owen, 1848
Wikimedia Commons Order
Wikimedia Commons Order
Wikipedia Order
Wikipedia Order
Wikipedia Order
Wikipedia Order
iNaturalist Images Order

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EOL content is automatically assembled from many different content providers. As a result, from time to time you may find pages on EOL that are confusing.

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