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
Integrated Taxonomic Information System (ITIS)
view in classification
NCBI Taxonomy
view in classification
FALO Classification
view in classification
IABIN resource Phylum Import
Initial Tree of Life web Import
  • Vertebrata
Animal Diversity Web Descriptions
Paleobiology Database
view in classification
Unranked clade
SPIRE resource
  • Vertebrata
Sloan-CoML NameLink Project
  • Vertebrata
South African Vertebrates
view in classification
Sub Phylum
Tree of Life web project
  • Vertebrata
Wikipedia Phylum


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.

To request an improvement, please leave a comment on the page. Thank you!