Ukrainian Bisonocerida Cited by user Стефанко1982 on 28 Sep 2022 Bisonocerida — вимерлий ряд головоногих молюсків підкласу наутилоїдей (Nautiloidea), що існував в ордовицькому та силурійському періодах.
English Bactroceras Cited by user Fanboyphilosopher on 31 May 2022 Bactroceras is a genus of orthoceratoid cephalopods that lived during the early Middle Ordovician, from about 472—464 mya, existing for approximately 8 million years.
English Riocerida Cited by user Fanboyphilosopher on 31 May 2022 Riocerida, originally named as Rioceratida, is an extinct order of Ordovician nautiloid cephalopods.
English Orthoceratoidea Cited by user Fanboyphilosopher on 31 May 2022 Orthoceratoidea is a major subclass of nautiloid cephalopods. Members of this subclass usually have orthoconic (straight) to slightly cyrtoconic (curved) shells, and…