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Plethoschisma grandis
Taxonomy
Plethoschisma grandis was named by Sprinkle (1974). Its type specimen is MCZ 752 and is a 3D body fossil. Its type locality is IK-3. Ikes Canyon sponge beds, Toquima Range, which is in a Rangerian carbonate limestone in the Antelope Valley Formation of Nevada. It is the type species of Plethoschisma.
Synonymy list
| Year | Name and author |
|---|---|
| 1974 | Plethoschisma grandis Sprinkle pp. 1188 - 1194 figs. Pl. 3, figs. 8-12; P1. 4; Pl. fig. 6 |
| 1995 | Plethoschisma grandis Sumrall and Sprinkle pp. 777 - 778 figs. 1.1, 1.2, 2.1-2.5, 3.1-3.6 |
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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.
†Plethoschisma grandis Sprinkle 1974
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| C. D. Sumrall and J. Sprinkle 1995 | Large deltacystinid with strongly asymmetrical profile, plates in regular circlets with open lateral circlet at IL3/R3 and L5 interruptingR 1/R5; two stronglyc ompressed conjunct pectinirhombs (B2/IL2, IL3/L4) present on dorsal surface; B2, IL2, IL3, and L4 greatly enlarged for pectinirhomb placement; periproct small, occupying about 20 percent of ventral surface, bordered by IL4, IL5, LI, and L4. |