Sphenodus
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| Order Synechodontiformes DUFFIN et WARD, 1993 |
| Family Orthacodidae GLÜCKMAN, 1957 |
| Genus Sphenodus AGASSIZ, 1843 |
| Sphenodus lundgreni (DAVIS, 1890): Selandian (Paleocene), Berdeyka, Volgograd Region, Volga Area, Russia |
| 40 mm H |
| Sphenodus schurowskii: Tithonian (Late Jurassic), Voskresensk, Moscow Region, Russia |
| 14 mm H, 14 mm H |
| Sphenodus sp.: Oxfodian (Late Jurassic), Holderbank, Switzerland |
| 11 mm H |
| 20061217 |
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