|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Crinoidea - Cladida - Tribrachyocrinidae
It was corrected as Tribrachiocrinus by Etheridge (1892).
It was assigned to Poteriocrinidae by Etheridge (1892); to Tribrachyocrinidae by Webster and Jell (1999); and to Cladida by Sepkoski (2002).
|Year||Name and author|
|1847||Pentadia Dana p. 152|
|1847||Pentadia reniformis Dana p. 152|
|1847||Pentadia spatangus Dana p. 152|
|1847||Pentadia trigona Dana p. 152|
|1847||Tribrachyocrinus M'Coy p. 228|
|1892||Tribrachiocrinus Etheridge Jr. p. 82|
|1999||Tribrachyocrinus Webster and Jell p. 329|
|2002||Tribrachyocrinus Sepkoski, Jr.|
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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.