Chonecetus is an extinct genus of primitive baleen whale of the family Aetiocetidae[1] that lived in the Oligocene period.

[2] Its fossils have been found in Canada,[3] in the northeast Pacific.

Like Aetiocetus, Chonecetus possessed both multicusped teeth and the nutrient foramina required for baleen.

[5] Chonecetus closely resembled a modern Mysticeti, with an elongate, streamlined body supporting a pair of paddle-shaped forelimbs, and a horizontal tail fluke strengthened by fibrous cartilage.

This prehistoric cetacean-related article is a stub.