Shark Ancestors. Genus Status Age Location Notes † Acanthacanthus [1] Valid. Early Lochkovian (earliest Devonian ). [1] Severnaya Zemlya, Russia . [1] A vesperaliid based on scales . [2] † Acanthodopsis Valid. Carboniferous . [3] Europe , Australia . [3] An unusual acanthodid with tooth-like ossifications on its jaws. [3] † Acanthopora [1] Valid. Early Lochkovian (earliest Devonian ). [1] Severnaya Zemlya, Russia . [1] A small ischnacanthid similar to Poracanthodes . [1] † Acanthospina [1] Valid. Early Lochkovian (earliest Devonian ). [1] Severnaya Zemlya, Russia . [1] A probable ischnacanthiform with scales similar to hybodontiform sharks. [1] [3] † Acanthodes Valid. Devonian ? to Cisuralian (Early Permian ). [4] Europe , North America , China ? One of the most well-known acanthodians, a filter-feeding acanthodid ...
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