Authors: M.J. de Kluijver & S.S. Ingalsuo
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 Kingdom Animalia
 Phylum Chordata
 Subphylum Tunicata
 Class Ascidiacea
 Order Enterogona
 Order Pleurogona
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General introduction, overview of the species treated and functionality of the site
A tree, picture gallery and alphabetical lists provide access to the species and higher groups
Descriptions of species
Descriptions of higher groups
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Identification keys
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Concise explanation of the BIS program
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