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Was thought to be a sponge; later recognized to be an algae.

Tetradium was named by Dana (1846) [Sepkoski's age data: O Llde-u O Ashg-u Sepkoski's reference number: 160]. It is not extant.

It was replaced with Prismostylus by Pojeta et al. (2003).

It was assigned to Tetradiidae by Murray (1985); to Tabulata by Sepkoski (2002); and to Rhodophyta by Steele-Petrovich (2009).

Synonymy list
YearName and author
1846Tetradium Dana
1985Tetradium Murray p. 32
2002Tetradium Sepkoski, Jr.
2009Tetradium Steele-Petrovich

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subkingdomBiliphytaCavalier-Smith 1981
phylumRhodophytaWettstein 1922
genusTetradiumDana 1846

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.

No diagnoses are available