623
Cetacea (Dolphin, Porpoise, Whale)
Cetacea
The order Cetacea includes the marine mammals commonly known as whales, dolphins, and porpoises. Cetus is Latin and is used in biological names to mean 'whale'. Its original meaning, 'large sea animal', was more general. It comes from Ancient Greek ????? (k?tos), meaning 'whale' or "any huge fish or sea monster". In Greek mythology, the monster Perseus defeated was called Ceto, which is depicted by the constellation of Cetus. Cetology is the branch of marine science associated with the study of cetaceans.
Fossil evidence suggests that the cetaceans share a common ancestor with land-dwelling mammals that began living in marine environments around 50 million years ago. Today, they are the mammals best adapted to aquatic life. The body of a cetacean is fusiform (spindle-shaped). The forelimbs are modified into flippers. The tiny hindlimbs are vestigial; they do not attach to the backbone and are hidden within the body. The tail has horizontal flukes. Cetaceans are nearly hairless, and are insulated from the cooler water they inhabit by a thick layer of blubber.
180403
Cetacea
623.jpg
image/jpeg
13054
2012-04-20T09:36:49Z
651
Aquatic foods
Cetaceans
Type 1
2011-02-09T00:37:52Z
2019-05-14T18:05:28Z
false
specific
9721
false
FOOD00609