description Cynthiacetus peruvianus Overview
Cynthiacetus peruvianus is an extinct basilosaurid archaeocete from late Eocene deposits of the Pisco Basin in Peru, described in 2011. The species extended confirmed basilosaurid distribution to the South American Pacific coast. Cynthiacetus was a fully aquatic whale with greatly reduced hind limbs and is among the larger known basilosaurids, with multiple species identified from both sides of the Atlantic. The Peruvian remains have contributed to understanding of late Eocene cetacean diversity in the Southern Hemisphere.
help Cynthiacetus peruvianus FAQ
What is Cynthiacetus peruvianus, and where was it found?
It was an extinct basilosaurid archaeocete, an early whale, from the Otuma Formation in Peru's Pisco Basin. The species was described in 2011 from Late Eocene to Early Oligocene rocks. [Research paper](https://www.sciencedirect.com/science/article/pii/S1631068311000546)
Could Cynthiacetus peruvianus still walk on land like earlier whales?
No. Fossil evidence places it among fully aquatic basilosaurids, meaning it belonged to a stage when whale ancestors were committed to marine life rather than moving between shore and sea. [Research paper](https://www.sciencedirect.com/science/article/pii/S1631068311000546)
Why is the Peruvian fossil record important for basilosaurids?
Cynthiacetus peruvianus extended confirmed basilosaurid fossils to the Pacific coast of South America. Its Pisco Basin location helps show that these early whales had a wider geographic range than a North Atlantic record alone would suggest. [Research paper](https://www.sciencedirect.com/science/article/pii/S1631068311000546)
Is Cynthiacetus peruvianus a modern baleen whale or toothed whale?
Neither in the modern taxonomic sense. It was an archaeocete, an extinct early-whale group that lived before the modern baleen and toothed whale families became the forms seen today. [Research paper](https://www.sciencedirect.com/science/article/pii/S1631068311000546)
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