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Radiolaria - Albaillellaria - Ceratoikiscidae

Circulaforma was named by Cheng (1986) [Sepkoski's age data: C Vise-u C Bash-u Sepkoski's reference number: 701]. Its type is Circulaforma delicata.

It was assigned to Spumellaria by Sepkoski (2002); and to Ceratoikiscidae by Aitchison et al. (1999), De Wever et al. (2001) and Noble et al. (2017).

C. admissarius, C. delicata (type species)
Species lacking formal opinion data

View classification of included taxa

Synonymy list
YearName and author
1986Circulaforma Cheng
1999Circulaforma Aitchison et al. p. 156
2001Circulaforma De Wever et al. p. 92
2002Circulaforma Sepkoski, Jr.
2017Circulaforma Noble et al. p. 423

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phylumRetariaCavalier-Smith 1999
classRadiolariaMüller 1858
superorderPolycystina(Ehrenberg 1867)
orderAlbaillellariaDeflandre 1953
familyCeratoikiscidaeHoldsworth 1969
genusCirculaformaCheng 1986

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