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Hystrichopsydrax sandersi
Taxonomy
Hystrichopsydrax sandersi was named by Guensburg (1988). Its type specimen is PE 25565, a test, and it is a 3D body fossil. Its type locality is North end of Orchard Creek Exposure, 1.6 km north of Thebes, which is in a Richmondian shallow subtidal limestone/shale in the Orchard Creek Shale Formation of Illinois. It is the type species of Hystrichopsydrax.
Synonymy list
| Year | Name and author |
|---|---|
| 1988 | Hystrichopsydrax sandersi Guensburg pp. 122 - 123 figs. 8.4, 9-12 |
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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.
†Hystrichopsydrax sandersi Guensburg 1988
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| T. E. Guensburg 1988 | Isorophina with low domal theca, short straight ambulacra; oral area includes four large primary orals; ambulacral coverplates probably forming alternating multiple biseries; anal structure valvular, cone shaped, composed of upturned lath-shaped plates; interambulacrals not abutting, consist of tacklike spinose plates interspersed with small ovoid plates; proximal peripheral rim circlet comprised of large exteriorly curved plate ring, plates mutually articulating along vertical sutures; succeeding peripheral rim plates spinose. |