What are the living fossils of the animal kingdom? What are the main characteristics of green turtles?
Green sea turtles, belonging to the hard shell turtle family, sea turtles. It is distributed around the polar regions, from 35 degrees north latitude to 35 degrees south latitude, but it is mainly distributed in tropical to subtropical waters. What does it look like? What are the characteristics? let's take a look at them.
The body is long oval, the back armour has four pairs of side shields, and the central shield is five, arranged in the shape of tiles, not covering each other. The body color ranges from brown to black, and sometimes the toenail has large flower markings. Mature green turtles can have a straight line length of more than 1 meter and weigh more than 100 kilograms.
Green turtles are currently one of the largest species of sea turtles. It is estimated that the global population is more than 200000, but most of them are distributed in a small number of areas. In addition, the number of sea turtles in most areas has increased as a result of successful conservation. In most areas, sea turtle populations are decreasing, and spawning sites are disappearing.
Sea turtles are living fossils in the animal kingdom, which first appeared in the Triassic period 200 million years ago and appeared at the same time as dinosaurs. The ancestors of sea turtles were freshwater turtles, which gradually moved from land to sea in the process of evolution. at that time, their flippers and toes on their fins were very similar to those of today's freshwater turtles, but now they have salt-secreting lacrimal glands, so they can adapt to life in the sea.
There are seven species of sea turtles in the world. Early sea turtles divided into four different types, two of which became extinct because they were unable to feed effectively, and the third appeared about 110 million years ago, of which only leather turtles preyed on planktonic jellyfish, the most food in the sea at that time. so it became the only species that survived.
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