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
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Species Import
BOLDS resource for species-level taxa
BioImages resource
DiscoverLife map resource
  • Alcyonium digitatum
Dutch Marine and Coastal Species Encyclopedia
  • Alcyonium digitatum
EOL Group on Flickr
Encyclopedia of Marine Life of Britain and Ireland Resource
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GBIF Elevation Data Species
Global Biotic Interactions Species
BHL: BioDivLibrary's photostream
Integrated Taxonomic Information System (ITIS)
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Inventaire National du Patrimoine Naturel Species
MarLIN resource
NCBI Taxonomy
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OBIS Environmental Information
  • Alcyonium digitatum Linnaeus, 1758
OBIS depth range resource
SERPENT resource
Monthly ARKive text import
World Register of Marine Species (WoRMS)
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Wikimedia Commons
iSpot links Species


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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