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Hadrodiscus
Taxonomy
Hadrodiscus was named by Smith and Jell (1990) [Sepkoski's age data: ]. Its type is Hadrodiscus parma.
It was assigned to Isorophida by Smith and Jell (1990) and Sepkoski (2002).
It was assigned to Isorophida by Smith and Jell (1990) and Sepkoski (2002).
Species
H. parma (type species)
Synonymy list
| Year | Name and author |
|---|---|
| 1990 | Hadrodiscus Smith and Jell p. 732 |
| 2002 | Hadrodiscus 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.
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| A. B. Smith and P. A. Jell 1990 | An isorophid with a poorly differentiated peripheral ring, straight ambulacra with small, tightly fitting cover plates and larger oral cover plates. Hydropore/gonopore a large, prominent opening. Oral frame composed largely of stout, wing-shaped elements. |
Measurements
No measurements are available
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| Source: c = class, p = phylum | |||||
| References: Aberhan 1992, Aberhan et al. 2004 | |||||