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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Class
NMNH Invertebrate Zoology resource Class
BioLib.cz Import
BioLib.cz Import Class
Integrated Taxonomic Information System (ITIS)
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Class
NCBI Taxonomy
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Class
IABIN resource Class
OBIS depth range resource Class
Ocean Genome Resource- genomic DNA available Class
Paleobiology Database
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Class
BOLDS resource for species-level taxa Class
Wikimedia Commons Class
  • Pterobranchia
Wikipedia

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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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