| Order Xenacanthiformes BERG, 1955A |
| Family Xenacanthidae FRITSCH, 1889 |
| Genus Triodus JORDAN, 1849 |
| Triodus sp.: Permian, Odernhien, Germany |
Xenacanthus
ver. 1.0
| Order Xenacanthiformes BERG, 1955A |
| Family Xenacanthidae FRITSCH, 1889 |
| Genus Xenacanthus BEYRICH, 1848 |
| Xenacanthus texensis (COPE, 1884): Lower Permian, Wellington Formation, Jefferson county, Oklahoma |
| 20 mm W |
| Xenacanthus angatubensis WEHMUTH RAGONHA, 1984: Permian, Corumbatai Formation, Sao Paulo State, Brazil |
| 12 mm W |
| 20120110 |
Symmorium
ver. 1.1
| Order Symmoriiformes ZANGERL, 1981 | |
| Family Symmoriidae DEAN, 1909 | |
| Genus Symmorium COPE, 1893 |
| Symmorium sp.: Middle Mississippian, Harrodsburg and Salem (s) Limestone Formation,
Washington County, Indiana |
| Symmorium sp.: Middle Mississippian, Harrodsburg and Salem (s) Limestone Formation,
Washington County, Indiana |
| Symmorium sp. a; Upper Mississippian, Haney Limestone Formation, English County, Indiana, b; Middle Mississippian, Muldraugh Formation, Hardin County, Kentucky, c; Pennsylvanian, Stark Shale, Kansas city, Missouri. |
| 20111004 |
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