Behind the Headlines – World Book Student
  • Search

  • Archived Stories

    • Ancient People
    • Animals
    • Arts & Entertainment
    • Business & Industry
    • Civil rights
    • Conservation
    • Crime
    • Current Events
    • Current Events Game
    • Disasters
    • Economics
    • Education
    • Energy
    • Environment
    • Food
    • Government & Politics
    • Health
    • History
    • Holidays/Celebrations
    • Law
    • Lesson Plans
    • Literature
    • Medicine
    • Military
    • Military Conflict
    • Natural Disasters
    • People
    • Plants
    • Prehistoric Animals & Plants
    • Race Relations
    • Recreation & Sports
    • Religion
    • Science
    • Space
    • Technology
    • Terrorism
    • Weather
    • Women
    • Working Conditions
  • Archives by Date

Posts Tagged ‘tyrannosaurus’

Thailand’s New Shark-Toothed Dinosaur

Friday, October 18th, 2019

October 18, 2019

Recent excavations in central Thailand have led to the discovery of a new type of predatory dinosaur, Siamraptor suwati. The ancient creature belonged to a group of giant meat-eaters called carcharodontosaurs, which means shark-toothed reptiles. Siamraptor dates from the Cretaceous Period, a time in Earth’s history from about 145 million years ago to 66 million years ago. The Cretaceous was the last of the three periods that make up the Mesozoic Era, the time when the dinosaurs lived.

A reconstruction of a Siamraptor skull based on fossil evidence. Credit: Duangsuda Chokchaloemwong, et al/Nakhon Ratchasima Rajabhat University

Fossils found in Thailand helped scientists reconstruct the skull of the newly identified Siamraptor suwati dinosaur. Credit: Duangsuda Chokchaloemwong, et al/Nakhon Ratchasima Rajabhat University

Siamraptor (Siam is the previous name for Thailand; raptors were carnivorous, bipedal dinosaurs) is the first example of a carcharodontosaur to be found in Southeast Asia. Previous examples came from northern Africa and Europe, and close cousins have been found in Argentina (Giganotosaurus) and the United States (Acrocanthosaurus).

The fossilized bones of Siamraptor were found in 115-million-year-old rocks in the central Thai district of Ban Saphan between 2008 and 2013. Paleontologists from Thailand’s Nakhon Ratchasima Rajabhat University found the fossils—22 in all—while working on a project with Japan’s Fukui Prefectural Dinosaur Museum. The announcement that the fossils belonged to a new type of carcharodontosaur came in October 2019 after years of study. Siamraptor was not the first find for the Japan-Thailand Dinosaur Project. The team earlier identified two new types of plant-eating dinosaurs and an ancient relative of the alligator and crocodile.

Skeletal reconstruction of Siamraptor suwati showing the collected fossils of the ancient predator. Credit: Duangsuda Chokchaloemwong, et al/Nakhon Ratchasima Rajabhat University

Twenty-two fossils aided in the skeletal reconstruction of Siamraptor suwati. Credit: Duangsuda Chokchaloemwong, et al/Nakhon Ratchasima Rajabhat University

The Siamraptor fossils include parts of a single animal’s feet, hands, hips, spine, and skull. The animals’s bones were somewhat porous, containing air sacs that would have made the creature a lighter and more agile hunter. Nearby were also many Siamraptor teeth, suggesting that this animal had not been alone. Like sharks, dinosaurs shed teeth throughout their lives, particularly when they ate, and the Ban Saphan site (a floodplain during the Cretaceous Period) may have been a common feeding ground. Siamraptor probably preyed on plant-eating dinosaurs in the area, using its bladelike serrated teeth—measuring up to 6 inches (15 centimeters) long—to slice through tough dinosaur flesh.

Scientists classify Carcharodontosaurus with other meat-eating dinosaurs in a large group known as theropods. These animals make up one of two main groups of saurischian (lizard-hipped) dinosaurs. Saurischians include such famous dinosaurs as Tyrannosaurus and Velociraptor. Although Carcharodontosaurus is classified in the same main group as Tyrannosaurus and Velociraptor, it was not closely related to them.

Tyrannosaurus and Carcharodontosaurus shared such traits as big heads, long bodies, and short arms, but the animals’ snouts were quite different. Tyrannosaurus had a broad head and a wide mouth with teeth made for crushing bone and pulling away flesh. Carcharodontosaurus had a much narrower head and a more precise bite with sharper teeth meant for slicing flesh. The two apex predators (at the top of the food chain) appear to have coexisted in several areas, which probably made for some rather interesting confrontations.

Tags: asia, carcharodontosaurus, dinosaur, paleontology, Saurischians, thailand, tyrannosaurus, velociraptor
Posted in Animals, Current Events, History, Prehistoric Animals & Plants, Science | Comments Off

  • Most Popular Tags

    african americans archaeology art australia barack obama baseball bashar al-assad basketball black history month california china climate change conservation earthquake european union football france global warming isis japan language monday literature major league baseball mars mexico monster monday music mythic monday mythology nasa new york city nobel prize presidential election russia soccer space space exploration syria syrian civil war ukraine united kingdom united states vladimir putin women's history month world war ii