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Zonophyllum
Taxonomy
Cystiphyllum (Zonophyllum) was named by Wedekind (1924) [Sepkoski's age data: D l D Give Sepkoski's reference number: 1240]. It is not extant.
It was reranked as Zonophyllum by Hill (1956), Merriam (1974), Sepkoski (2002) and Pedder (2004).
It was assigned to Zonophyllinae by Hill (1956) and Merriam (1974); to Cystiphyllum by Wedekind (1924) and Hill (1981); to Rugosa by Sepkoski (2002); and to Cystiphyllidae by Pedder (2004).
It was reranked as Zonophyllum by Hill (1956), Merriam (1974), Sepkoski (2002) and Pedder (2004).
It was assigned to Zonophyllinae by Hill (1956) and Merriam (1974); to Cystiphyllum by Wedekind (1924) and Hill (1981); to Rugosa by Sepkoski (2002); and to Cystiphyllidae by Pedder (2004).
Subtaxa
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. †Zonophyllum Wedekind 1924
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†Zonophyllum haguei Merriam 1974
†Zonophyllum lonense Stumm 1937
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. W. Merriam 1974 | Medium-size and small solitary cysti- phylloids of ceratoid to cylindrical growth habit have thick stumpy to long septal crests in the peripheral zone of mature individuals; in longitudinal section the septal crests reveal thick trabecular spines which are directed distally and axially. The peripheral zone of small and medium-sized steeply inclined dissepiments passes axially into a zone of large dissepiments and periaxial tabellae. The axial zone has irregular, distally convex tabulae, some of which may be almost flat and wide. The ontogeny is distinctive. The late nepionic stage has about twelve thick stumpy septa touching laterally and has a suggestion of bilateral symmetry though no specific cardinal septum may be recogniz- able. In mid-neanic stage, there is a peripheral zone of dissepiments with thinner septal crests and an inner periaxial zone of thickened septal crests forming a sep- tal wreath. In later growth stages, dissepiments and tabellae are introduced between the two septal zones. Septal crests are usually thick and numerous peripherally in earlier ephebic stages. Advanced ephebic stages are cystiphylloid with traces of septal crests. |