All the information about Sea Turtle
Information on speed
Turtles or sea turtles
.Sea turtles (superfamily Chelonioidea), sometimes called marine turtles,[3] are reptiles of the order Testudines. There are seven species of sea turtles. They are the leatherback sea turtle, green sea turtle, loggerhead sea turtle, Kemp's ridley sea turtle, hawksbill sea turtle, flatback sea turtle and olive ridley sea turtle.
Four of the species have been identified as "endangered" or "critically
endangered" with another two being classed as "vulnerable".
The origin of Sea Turtles goes back to the Late Jurassic (150 Ma) with genera such as Plesiochelys, from Europe. In Africa, the first marine turtle is Angolachelys, from the Turonian of Angola.[4]
Sea turtles, along with other turtles and tortoises, are part of the order Testudines.
The seven living species of sea turtles are: leatherback sea turtle, green sea turtle, loggerhead sea turtle, Kemp's ridley sea turtle, hawksbill sea turtle, flatback sea turtle and olive ridley sea turtle.[5]
All species except the leatherback are in the family Cheloniidae. The
leatherback belongs to the family Dermochelyidae and is its only extant
member.
The species are primarily distinguished by their anatomy: for
instance, the prefrontal scales on the head, the number of and shape of scutes on the carapace, and the type of inframarginal scutes on the plastron. The leatherback
is the only sea turtle that does not have a hard shell; instead, it
bears a mosaic of bony plates beneath its leathery skin. It is the
largest sea turtle, measuring 6 to 9 feet (1.8 to 2.7 m) in length at
maturity, and 3 to 5 feet (0.91 to 1.52 m) in width, weighing up to
1,500 pounds (680 kg). Other species are smaller, being mostly 2 to 4
feet (0.61 to 1.22 m) and proportionally narrower.[6]
Sea turtles constitute a single radiation that became distinct from all other turtles at least 110 million years ago
ليست هناك تعليقات:
إرسال تعليق