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Subasaphus platyurus, Middle Ordovician, Duboviki Formation, St. Petersburg region, Russia - Houston Museum of Natural Science - DSC01474 photo
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Subasaphus platyurus (ventral prep), Middle Ordovician, Duboviki Formation, St. Petersburg region, Russia - Houston Museum of Natural Science - DSC01468 photo
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Subasaphus platyurus, Middle Ordovician, Duboviki Formation, St. Petersburg region, Russia - Houston Museum of Natural Science - DSC01471 photo
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Spaerocoryphe cranium, Middle Ordovician, St. Petersburg region, Russia - Houston Museum of Natural Science - DSC01490 photo
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Paraceraurus exsul, Middle Ordovician, Duboviki Formation, St. Petersburg region, Russia - Houston Museum of Natural Science - DSC01446 photo
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Megistaspidella extenuata, Middle Ordovician, Kunda Level, St. Petersburg area, Russia - Houston Museum of Natural Science - DSC01463 photo
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Hoplolichas sp., Middle Ordovician, Asery Level, St. Petersburg region photo
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Cyrtometopus sembnitzkii, Middle Ordovician, Volkhov-Lynna Formations, St. Petersburg region, Russia - Houston Museum of Natural Science - DSC01487 photo
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Cyrtometopella aries, Middle Ordovician, Duboviki Formation, St. Petersburg region, Russia - Houston Museum of Natural Science - DSC01486 photo
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Boedaspis ensifer, Middle Ordovician, Volkhov Formation, St. Petersburg region, Russia - Houston Museum of Natural Science - DSC01483 photo
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Boedaspis ensifer, Middle Ordovician, Volkhov Formation, St. Petersburg region, Russia - Houston Museum of Natural Science - DSC01437 photo
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Asaphus kowalewskii, Middle Ordovician, Duboviki-Porogi Formations, St. Petersburg region, Russia - Houston Museum of Natural Science - DSC01532 photo
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