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2012-05-20 17:12

Ancient giant turtle fossil was size of smart car



A turtle the size of a Smart car, with a shell large enough to double as a kiddie pool. Paleontologists from North Carolina State University have found just such a specimen -- the fossilized remains of a 60-million-year-old South American giant that lived in what is now Colombia, the Science Daily reported Thursday.

The turtle in question is Carbonemys cofrinii, which means "coal turtle," and is part of a group of side-necked turtles known as pelomedusoides, the report said. The fossil was named Carbonemys because it was discovered in 2005 in a coal mine that was part of northern Colombia's Cerrejon formation.

The specimen's skull measures 24cm, roughly the size of a regulation NFL football. The shell which was recovered nearby -- and is believed to belong to the same species -- measures 172 centimeters, or about 5 feet 7 inches, long, it said.

That's the same height as Edwin Cadena, the NC State doctoral student who discovered the fossil.

Cadena was quoted by the Science Daily as saying, "We had recovered smaller turtle specimens from the site. But after spending about four days working on uncovering the shell, I realized that this particular turtle was the biggest anyone had found in this area for this time period -- and it gave us the first evidence of giantism in freshwater turtles."

In addition to the turtle's huge size, the fossil also shows that this particular turtle had massive, powerful jaws that would have enabled the omnivore to eat anything nearby -- from mollusks to smaller turtles or even crocodiles.








관련 한글기사


‘악어를 한입에’ 초대형 고대거북 발견

약 6,000만년 전 남미 일대에 초대형 고대 거북이 존재했던 것으로 확인돼 화제가 되고 있다고 나우뉴스가 외신을 인용 보도했다.

17일 과학전문매체 사이언스데일리에 따르면 미국 노스캐롤라이나주립대 연구진이 지난 2005년 콜롬비아 석탄광산에서 발굴한 화석은 거대 거북의 것이었다고 고생물분류학 저널에 발표했다.

이 고대 거북은 세레존 지층에 있던 한 탄광에서 발견됐다 하여 ‘석탄 거북(coal turtle)’이라는 의미로 학명은 카보너미스 콘프리니(Carbonemys cofrinii)로 명명됐다고 보도는 전했다.

석탄 거북은 약 24cm 너비 두개골을 가지고 있으며 이는 미식 축구공 크기 정도로 매우 크다. 또한 등껍질 폭 역시 172cm에 달해 완벽하게 복원할 시 소형차 이상의 몸집을 갖고 있었던 것으로 추정되고 있다.

또한 연구진은 이 석탄 거북이 가로목거북에 속한다고 밝혔다. 가로목거북은 일반 거북과 달리 머리를 등껍질 안으로 집어넣는 대신 양옆으로 목을 꺾는 특징이 있다.

이 거북의 조상은 공룡들이 활동했던 시기에도 존재했으나, 거대화된 석탄 거북은 공룡이 사진지 500만년 후에나 출연한 것으로 추정된다.

따라서 이 거북의 천적은 거의 없었으며 커다란 몸집답게 식욕 또한 엄청났을 것이라고 연구진을 보고 있다고 보도는 전했다.


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