Who discovered the Remingtonocetidae?
Remingtonocetid cetaceans are a group of stem whales known from the Indo-Pakistan and North African Tethys Ocean. An unusual tooth was discovered by Peter J. Harmatuk in 1973 in the middle Eocene Superior Stone Quarry (now the Martin Marietta Quarry) near Castle Hayne, North Carolina, USA.
What did the dolphin evolve from?
The evolution of dolphins, or Delphinus, is believed to have started with the Pakiectus, a four legged, land walking mammal. The Pakiectus dates back to approximately 50 million years ago. Throughout the centuries, these animals have gone through drastic changes to become the modern day dolphin.
How did dolphins evolve blowholes?
These creatures began to evolve from a four-legged, land-dwelling mammalian ancestor, which had a nasal passage parallel to the palate, more than 50 million years ago. As cetaceans evolved, the blowhole gradually migrated from the tip of the snout to the back of the snout, and then gradually up to the top of the skull.
When did the Remingtonocetidae live?
Remingtonocetidae is a diverse family of early aquatic mammals of the order Cetacea, endemic to the coastline of the ancient Tethys Ocean during the Eocene (present-day Pakistan and India). Living from 55.8—48.6 mya, they existed for approximately 7.2 million years.
When did the Protocetidae live?
Protocetidae species lived 48 to 35 million years ago and are believed to have been amphibious, likely still giving birth on land but being predominantly aquatic. They had a large, powerful tail and feet, which would have allowed them to be excellent swimmers.
What is the closest relative to a dolphin?
The closest living relatives of dolphins today are the even toed ungulates such as camels and cows with the humble hippopotamus being the closest living relative. The origin of dolphins and the origin of whales in general is the subject of much debate.
Is there a similarity between a human and dolphin fetus?
As it turns out, dolphins and humans fetuses look pretty similar. When in the uterus, human fetuses briefly have an external tail, while dolphin fetuses show small hind protrusions. Again, this bone is a reminder of a time when dolphins were terrestrial mammals like us.
Why do whales have a hole on their back?
Because whales are mammals that need surface oxygen just like humans do, they use their blowholes as a way of breathing in and out at the water’s surface, allowing them to absorb enough oxygen to sustain them for a lengthy dive.
How old is the whale?
The Origin of Whales or the Evolution. The first whales appeared 50 million years ago, well after the extinction of the dinosaurs, but well before the appearance of the first humans. Their ancestor is most likely an ancient artiodactyl, i.e. a four-legged, even-toed hoofed (ungulate) land mammal, adapted for running.
What kind of animal was the Remingtonocetus named after?
Remingtonocetus is an extinct genus of early cetacean freshwater aquatic mammals of the family Remingtonocetidae endemic to the coastline of the ancient Tethys Ocean during the Eocene. It was named after naturalist Remington Kellogg .
Where was the Remingtonocetus harudiensis found in India?
- Remingtonocetus harudiensis, new combination, a middle Eocene archaeocete (Mammalia, Cetacea) from western Kutch, India. - Journal of Vertebrate Paleontology 6(4):326-349. - K. Kumar & A. Sahni - 1986.
What’s the timeline of the evolution of computers?
History of Computers: A Brief Timeline. This marks the evolution of the computer from a specialized machine for scientists and mathematicians to technology that is more accessible to the general public. 1969: A group of developers at Bell Labs produce UNIX, an operating system that addressed compatibility issues.
Which is older r.domandaensis or r.harudiensis?
Gingerich et al. 2001 interpreted R. domandaensis as an older and more generalized species than R. harudiensis.