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
MCZ resource
Herpetology Resource Import
Integrated Taxonomic Information System (ITIS)
view in classification
Global Invasive Species Database (GISD)
  • Boa constrictor imperator
EOL Group on Flickr
NCBI Taxonomy
view in classification
Smithsonian type specimen data Subspecies
  • Boa constrictor imperator
Type data from iDigBio Subspecies
iNaturalist Images Subspecies


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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