Family
Karoceratidae Teichert, 1939
Selection of related publications
Kröger, B. 2025. The Lyckholm acme of cephalopods – Review of the late Katian (Vormsi–Pirgu regional stages) Ordovician cephalopods of Estonia. European Journal of Taxonomy 978, 1-169. DOI:10.5852/ejt.2025.978.2801
Frye, M. W. 1987. Upper Ordovician (Harjuan) oncoceratid nautiloids from the Boda Limestone, Siljan District, Sweden. GFF 109, 1, 83-99. DOI:10.1080/11035898709454748
List of species
1. Kallholnoceras cornutum Frye, 1987 | Katian
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Classification
| Organism group | Biota |
| Kingdom | Animalia |
| Phylum | Mollusca |
| Class | Cephalopoda |
| Subclass | Multiceratoidea |
| Order | Oncocerida |
| Suborder | Polyelasmoceratidae |
| Family | Acleistoceratidae |
| Diestoceratidae | |
| Graciloceratidae | |
| Hemiphragmoceratidae | |
| Jovellaniidae | |
| Karoceratidae | |
| Genus | Kallholnoceras |
| Family | Oncoceratidae |
| Phtanoncoceratidae | |
| Trimeroceratidae | |
| Valcouroceratidae |