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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NMNH Invertebrate Zoology resource Genus
BOLDS images II Genus
BOLDS resource for species-level taxa Genus
  • Sagitta
Global Biotic Interactions Genus
IABIN resource Genus Import Genus Import
Integrated Taxonomic Information System (ITIS)
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Library of Alexandria
  • Sagitta
NCBI Taxonomy
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BOLDS resource for higher-level taxa
NatureServe resource Genus
OBIS Environmental Information
  • Sagitta Quoy and Gaimard, 1827
OBIS depth range resource Genus
SPIRE resource Genus
Sloan-CoML NameLink Project
  • Sagitta
Smithsonian type specimen data Genus
AntIZ taxon descriptions Genus
Tropicos resource Genus
World Register of Marine Species (WoRMS)
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Wikimedia Commons
Wikimedia Commons Genus
Wikipedia 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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