Philip Gingerich, a professor of paleontology at the University of Michigan and probably the world’s foremost expert on the evolution of whales, has found another early species of whale that tells us much about the habitat they lived in and their habits. Wired has the story:
Early whales hunted at sea but spent the rest of their time on land, suggest two newly-described fossil whales — one of them a pregnant female — believed to represent a transitional species between earth- and water-bound behemoths.
Dating from 47.5 million years ago, the whales had large teeth suited for consuming fish, and flipper-like limbs that could support their weight on land, albeit awkwardly. The fetal skeleton was positioned for head-first delivery, typically seen in land mammals. Modern whales give birth tail-first.
“They clearly were tied to the shore,” said study co-author Philip Gingerich, a University of Michigan paleontologist, in a press release. “They were living at the land-sea interface and going back and forth.”
Gingerich’s team dubbed the whales Maiacetus inuus. Maicetus means “mother whale,” and Inuus was a Roman fertility god.
Gingerich is responsible for discovering a number of early whale specimens that document the transition from land-dwelling mammals closely related to the ancestors of hippos to modern whales. The full paper can be read here.