sekioida
Sekioida is a term that refers to a specific type of ancient cephalopod fossil. These fossils are primarily found in the Devonian period, dating back approximately 419 to 359 million years ago. Sekioida are characterized by their coiled, chambered shells, which exhibit a distinct helical or spiral arrangement. This coiled structure is a key feature distinguishing them from other nautiloids and ammonoids, which also possessed chambered shells.
The internal structure of sekioid shells typically shows a series of chambers separated by walls called septa.
Fossils of sekioida are important for understanding the evolutionary history of cephalopods and the paleoecology of