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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
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Order
Integrated Taxonomic Information System (ITIS)
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Order
Anage Data Order
Animal Diversity Web Descriptions Order
BOLDS resource for higher-level taxa
BOLDS resource for higher-level taxa
BOLDS images II Order
BOLDS resource for species-level taxa Order
EOL Group on Flickr Order
EOL hotlist Scratchpad Order
  • Rhynchocephalia
IRMNG
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Order
IRMNG
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Order
Global Biotic Interactions Order
IUCN Red List Order
IUCN Red List
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Order
BioLib.cz Import
AnAge database Order
MCZ resource Order
NCBI Taxonomy
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Order
Paleobiology Database
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Order
Monthly ARKive text import Order
IUCN Structured Data Order
Wikimedia Commons
Wikimedia Commons
Wikimedia Commons Order
Wikimedia Commons
Wikipedia 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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