Order
Rioceratida King et Evans, 2019
Selection of related publications
Sweet, W. C. 1958. The Middle Ordovician of the Oslo Region, Norway: 10. Nautiloid Cephalopods. Norsk Geologisk Tidsskrift 38, 1, 1-176.
List of species
1. Bactroceras angustisiphonatum (Rüdiger, 1889) | Lasnamägi Stage
2. Bactroceras avus Holm, 1898 | Darriwilian
3. Bactroceras sandbergeri Barrande, 1867 | Darriwilian
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Classification
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Mollusca |
| Class | Cephalopoda |
| Subclass | Orthoceratia |
| Order | Astroviida |
| Bajkalocerida | |
| Dissidoceratida | |
| Endoceratida | |
| Orthocerida | |
| Pseudorthocerida | |
| Rioceratida | |
| Family | Bactroceratidae |