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
Integrated Taxonomic Information System (ITIS)
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Class
IUCN Red List
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Class
Anage Data Class
Animal Diversity Web Descriptions Class
BioImages resource Class
Biology 260 Occidental College - Biodiversity & Organization of Marine Ecosystems Class
EOL Group on Flickr Class
EOL Group on Flickr Class
EOL Group on Flickr Class
  • Chondrichthyes
Encyclopedia of Marine Life of Britain and Ireland Resource Class
Environments Class
Environments Class
IRMNG
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Class
Fishes resource Class
Fishes resource Class
Global Biotic Interactions Class
Global Biotic Interactions Class
IUCN Red List Class
AnAge database Class
BioLib.cz Import
BioLib.cz Import Class
Monthly ARKive text import Class
Morphbank Resource Class
NCBI Taxonomy
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Class
NatureServe resource Class
OBIS Environmental Information
  • Chondrichthyes (Alder & Hancock, 1843)
Paleobiology Database
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Class
SERPENT resource Class
SPIRE resource
IUCN Structured Data Class
Wikimedia Commons
Wikimedia Commons
Wikipedia Class
Wikipedia Class
iNaturalist Images Class
iSpot southern Africa Class

Disclaimer

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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