| Estonioceras Temporal range: Ordovician | |
|---|---|
 | |
| Estonioceras, found in the uppermost layer in Stora stenbrottet at Mt. Kinnekulle, Sweden | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Cephalopoda |
| Subclass: | Nautiloidea |
| Order: | † Tarphycerida |
| Family: | † Estonioceratidae |
| Genus: | † Estonioceras Noetling, 1883 |
| Species | |
Estonioceras imperfectum(Quenstedt, 1845) | |
Estonioceras is an extinct genus of tarphyceridan nautiloids from the Ordovician of Europe.
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Aethoceras is a genus of Tarphycerida nautiloids included in the family Estonioceratidae for which the shell is a loosely coiled, gradually expanding dextral torticone with a slightly depressed whorl section. Siphuncle small, ventral, submarginal. Whorl section somewhat resembles early stages of Estonioceras in being laterally fanged. Trochoidal coiling brings to mind the later Trocholitidae. Aethoceras was originally found in the lower Ordovician of Western Australia.