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Helfriedella
Taxonomy
Helfriedella was named by Kozur and Sadeddin (1990) [Sepkoski's age data: J Bath J Oxfo Sepkoski's reference number: 924]. It is not extant. It is considered to be a form taxon.
It was assigned to Priscopedatidae by Kozur and Sadeddin (1990); and to Dendrochirotida by Sepkoski (2002).
It was assigned to Priscopedatidae by Kozur and Sadeddin (1990); and to Dendrochirotida by Sepkoski (2002).
Species
Synonymy list
| Year | Name and author |
|---|---|
| 1990 | Helfriedella Kozur and Sadeddin p. 356 |
| 2002 | Helfriedella Sepkoski |
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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. †Helfriedella Kozur and Sadeddin 1990
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†Helfriedella mesojurassica Kozur and Sadeddin 1990
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H. Kozur and W. Sadeddin 1990 | Sieve-plate plane, subcircular, subquadratic or irreg- ular. Outer margin smooth or undulated. In the central field 4 large, cross-shaped, regularly arranged pores are present, sur- rounded by an irregular ring of moderately large pores. In places this pore-ring is reduced to 4 pores arranged intermittently to the large central pores. |