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Ctenacanthus
ver. 1.1
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Order

Ctenacanthiformes ZANGERL, 1981
Family Ctenacanthidae DEAN, 1909
Genus Ctenacanthus AGASSIZ, 1835

Ctenacanthus artiensis Kozlov, 2000: Lower Permian, Arty Formation, Krasnoufimsk, Middle Ural, Russia

8 mm W

Ctenacanthus obruchevi: Lower Permian, Arty Formation, Krasnoufimsk, Middle Ural, Russia

5 mm W, 5.1 mm W

Ctenacanthus amblyxiphias (COPE, 1891)/ Symmorium reniforme  ST.JOHN et WORTHEN, 1875: Upper Mississippian, Indian Springs Formation, Crawford County, Indiana

10 mm W

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.


:a; Symmorium acutus b; Symmorium sp.: Lower Carboniferous (Moscovian, Middle Pennsylvanian), kazimov Formation, Achkasovo, Moscow region

12 mm W, 3 mm W
Symmorium lamnoides: Lower Carboniferous (Moscovian, Middle Pennsylvanian), kazimov Formation, Achkasovo, Moscow region



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20111004 Fumio Nakagawa

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