|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Holothuroidea (sea cucumber)
It was reranked as the class Holothuroidea by Frizzell and Exline (1966), Barnes (1998), Boczarowski (2001) and Sepkoski (2002).
It was assigned to Echinozoa by Boczarowski (2001); and to Echinodermata by Frizzell and Exline (1966), Barnes (1998) and Sepkoski (2002).
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.