Turtles



Turtles, Tortoises, and Terrapins are reptiles of the Order Testudines (all living turtles belong to the crown group Chelonia), most of whose body is shielded by a special bony or cartilagenous shell developed from their ribs. The Order Testudines includes both extant (living) and extinct species, the earliest known turtles being from around 215 million years ago, making turtles one of the oldest reptile groups, and a much more ancient group than lizards and snakes. About 300 species are alive today; some are highly endangered.




Paleontology



Turtle Fossils




Mythology


Turtle Island is the name of North America, according to some indigenous groups. The Lenape story of the "Great Turtle" was first recorded between 1678 and 1680 by Jasper Danckaerts. The story is shared by other Northeastern Woodlands tribes, notably the Iroquois. The term originates mainly from oral tradition, in the tale of the westward travel of the Anishinabe tribe on the land known as Turtle Island, as recorded also in the birch bark scrolls.

According to Iroquois oral history, Sky Woman fell down to the earth when it was covered with water. Various animals tried to swim to the bottom of the ocean to bring back dirt to create land. Muskrat succeeded in gathering dirt, which was placed on the back of a turtle, which grew into the land known today as North America. In the Seneca language, the mythical turtle is called Hah-nu-nah, while the name for an everyday turtle is ha-no-wa.

The name Turtle Island is used today by many Native tribes, Native rights activists, and environmental activists, especially since the 1970s when the term came into wider usage. In a later essay, published in At Home on the Earth, Gary Snyder claimed this title as a term referring to North America that synthesizes both indigenous and colonizer cultures by translating the indigenous name into the colonizer's languages (the Spanish "Isla Tortuga" being proposed as a name as well). Snyder argues that understanding North America under the name of Turtle Island will help shift conceptions of the continent.




Maya



Heathstone constellation, positioned on the back of the turtle, or the constellation Orion, seen on Madrid Codex page 71a (after Codice Tro-Cortesianus (Codex Madrid). Akademische Druck-und Verlagsanstalt, Graz, 1967). It consists of the stars Alnitak (the lowest star in Orion's Belt), Saiph, and Rigel.




In the News ...





8-Year-Old's Fossil Discovery Explains Why Turtles Have Shells   Live Science - July 18, 2016
The proto-turtle Eunotosaurus burrows into the banks of a dried up pond to survive in the harsh, arid South African environment about 260 million years ago. In the background, a herd of Bradysaurus, a type of reptile, crowds around some muddy water. The turtle's shell may serve as a protective shield nowadays, but ancient turtles actually developed shells for an entirely different reason, a new study finds. Researchers looked at the remains of 47 ancient proto-turtles (Eunotosaurus africanus), ancient reptiles that sported partial shells. These animals had broadened ribs that likely helped them burrow underground, rather than serving as protective armor, the researchers said.




Researchers discover real reason why turtles have shells   PhysOrg - July 15, 2016
The earliest beginnings of the turtle shell was not for protection but rather for digging underground to escape the harsh South African environment where these early proto turtles lived.




  Famous Giant Turtle Dies - Only Three Left on Earth   National Geographic - February 2, 2016
The death of Cu Rua, long revered in Vietnam, brings the critically endangered Yangtze giant softshell turtle one step closer to extinction.




New Giant Tortoise Species Found on Galapagos Islands   National Geographic - October 21, 2015
The reptiles evaded detection as a distinct species for over a hundred years.


New Species of Giant Tortoise Found in the Galapagos   Live Science - October 21, 2015
Paging Charles Darwin: The island of Santa Cruz within the Galapagos has not one but two distinct species of giant tortoise, a new genetic study finds. For years, researchers thought that the giant tortoises living on the western and eastern sides of Santa Cruz belonged to the same species. But the tortoises look slightly different, and so recently, scientists ran genetic tests on about 100 tortoises from both groups. The tests were definitive: The two tortoise populations, which live only about 6 miles (10 kilometers) apart on the opposite sides of the island, are actually extremely distant relatives.




'Lost' sea turtles don't go with the flow   BBC - April 10, 2015
A tracking study has shown that young sea turtles make a concerted effort to swim in particular directions, instead of drifting with ocean currents. Baby turtles disappear at sea for up to a decade and it was once assumed that they spent these "lost years" drifting.




Turtles and dinosaurs: Scientists solve reptile mysteries with landmark study on the evolution of turtles   Science Daily - November 24, 2014
A team of scientists has reconstructed a detailed 'tree of life' for turtles. Next generation sequencing technologies have generated unprecedented amounts of genetic information for a thrilling new look at turtles' evolutionary history. Scientists place turtles in the newly named group 'Archelosauria' with their closest relatives: birds, crocodiles, and dinosaurs.




Meet Jonathan, St Helena's 182-year-old giant tortoise   BBC - March 13, 2014
Jonathan is a rare Seychelles Giant. His lawn-fellows hail from the Aldabra Atoll in the Indian Ocean. Aldabra Giants number about 100,000, but only one small breeding population of Seychelles tortoises exists.During the 17th Century ships could contain hundreds of easily-stacked tortoises, like a fast-food takeaway. In the Galapagos islands alone around 200,000 tortoises are thought to have been killed and eaten at this time. How did Jonathan avoid this fate?





ANIMAL INDEX


PHYSICAL SCIENCES INDEX


A-Z


CRYSTALINKS HOME PAGE


PSYCHIC READING WITH ELLIE


2012 THE ALCHEMY OF TIME