Kingdom Animalia Class Cephalopoda Order Tarphycerida | Phylum Mollusca Subclass Nautiloidea Rank Family | |
Similar Estonioceras, Tarphycerida, Nautilida, Nautiloid | ||
The Estonioceratidae are a family of loosely coiled tarphycerids in which the inner side of the whorls, which forms the dorsum, is rounded or flat with no impression, and in which the siphuncle, composed of thick tubular segments, is located ventrally. The Estonioceratidae seem to form a link between the ancestral Bassleroceratidae and the more tightly coiled Tarphyceratidae.
References
Estonioceratidae Wikipedia(Text) CC BY-SA