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.

Preferred marks the preferred classification for this taxon.

Recognized By Rank Classification
Species 2000 & ITIS Catalogue of Life: April 2013
view in classification
Macroecological database of mammalian body mass-to be deleted- Genus
Animal Diversity Web Descriptions Genus
BOLDS resource for higher-level taxa
BOLDS images II Genus
BOLDS resource for species-level taxa Genus
Biome & Ecoregion Resource Genus
Conabio Genus
EOL Group on Flickr Genus
view in classification
Freshwater and Marine Image Bank, University Libraries, U Washington
Global Biotic Interactions Genus
Global Biotic Interactions Genus
INBio resource Genus
IUCN Red List Genus
IUCN Red List
view in classification
Genus Import Genus Import
Integrated Taxonomic Information System (ITIS)
view in classification
Life History Characteristics of Placental Non-Volant Mammals-to be deleted- Genus
Life History Characteristics of Placental Non-Volant Mammals Genus
AnAge database Genus
Macroecological database of mammalian body mass Genus
Mammal life history Genus
Mammals Resource Genus
Milk Chemical Data Genus
NCBI Taxonomy
view in classification
NatureServe resource Genus
North American Mammals Resource Genus
OBIS Environmental Information
  • Trichechus Linnaeus, 1758
OBIS depth range resource Genus
One-time import of archived NBII images Genus
Paleobiology Database
view in classification
Smithsonian type specimen data Genus
Monthly ARKive text import Genus
Wikimedia Commons Genus
Wikimedia Commons
Wikipedia Genus
Wikipedia Genus
iNaturalist Images Genus


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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