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
view in classification
OBIS depth range resource Genus
BOLDS images II Genus
BOLDS resource for species-level taxa Genus
Encyclopedia of Marine Life of Britain and Ireland Resource Genus
Global Biotic Interactions Genus
Global Biotic Interactions Genus Import Genus Import
Integrated Taxonomic Information System (ITIS)
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Inventaire National du Patrimoine Naturel Species
MarLIN resource Genus
Moorea Biocode
  • Ascidia
NCBI Taxonomy
view in classification
NMNH Invertebrate Zoology resource Genus
OBIS Environmental Information
  • Ascidia Linnaeus, 1767
BOLDS resource for higher-level taxa
Ocean Genome Resource- genomic DNA available Genus
Invertebrates of the Salish Sea Genus
SPIRE resource
Sloan-CoML NameLink Project
  • Ascidia
Smithsonian type specimen data Class
Smithsonian type specimen data Genus
AquaMaps Resource Genus
The Dutch Ascidians Homepage Resource Genus
  • Ascidia adhaerens Ritter, 1901
  • Ascidia rhabdophora Sluiter, 1904
World Register of Marine Species (WoRMS)
view in classification
Wikimedia Commons
Wikimedia Commons Genus
Wikipedia Genus
Wikipedia Genus
iNaturalist Images Genus


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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