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Cyathactis
Taxonomy
Cyathactis was named by Soshkina (1955).
It was assigned to Cyathactidae by Kaljo (1958); to Lykophyllidae by Merriam (1972); to Ptychophyllidae by Hill (1981); and to Rugosa by Sepkoski (2002).
It was assigned to Cyathactidae by Kaljo (1958); to Lykophyllidae by Merriam (1972); to Ptychophyllidae by Hill (1981); and to Rugosa by Sepkoski (2002).
Species
Species lacking formal opinion data
Synonymy list
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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.
G. †Cyathactis Soshkina 1955
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†Cyathactis balticus Kaljo 1958
†Cyathactis gazellensis Merriam 1972
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. W. Merriam 1972 | Small to medium-sized trochoid and ceratoid Lykophyllidae. Septa numerous, long, thin, smooth, fairly straight at maturity; a wide dissepimentarium of small and medium globose dissepiments. Tabularium medium wide with closely spaced, mostly incomplete, axially flattened tabulae and marginal tabellae. No septal stereozone. Crowded dissepiments with anguloconcentric chevron pattern in transverse section. |