but were already in decline by the middle of this period with most genera becoming extinct by the end of the Sandbian (late Ordovician), while some rare hangers on lasted into the Silurian. In any case, the endocerid lineage became completely extinct relatively early on in cephalopod history.

Classification

Evolution

Endocerids evolved from the earlier ellesmerocerids, most likely from a genus similar to Pachendoceras.

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