New species of duckbilled dinosaurs identified Study

first_imgHouston: Scientists have identified a new species of duck-billed dinosaurs which roamed the Earth around 80 million years ago. The study, published in the Journal of Systematic Palaeontology, describes the most complete skull of a duck-billed dinosaur from Big Bend National Park in the US as a new genus and species, named Aquilarhinus palimentus. This dinosaur has been named for its aquiline nose and wide lower jaw, shaped like two trowels laid side by side. Also Read – Imran Khan arrives in China, to meet Prez Xi JinpingIn the 1980s, Professor Tom Lehman from Texas Tech University in the US discovered badly-weathered bones. Research in the 1990s revealed an arched nasal crest thought to be distinctive of the hadrosaurid Gryposaurus. However, it was not until recent analysis that the researchers came to realise that the specimen was more primitive than Gryposaurus and the two major groups of duck-billed dinosaurs. “This new animal is one of the more primitive hadrosaurids known and can therefore help us to understand how and why the ornamentation on their heads evolved, as well as where the group initially evolved and migrated from,” said Albert Prieto-Marquez from the Miquel Crusafont Catalan Institute of Paleontology in Spain. Also Read – US blacklists 28 Chinese entities over abuses in Xinjiang”Its existence adds another piece of evidence to the growing hypothesis, still up in the air, that the group began in the southeastern area of the US,” Prieto-Marquez said. Duck-billed dinosaurs, also known as hadrosaurids, were the most common herbivorous dinosaurs at the end of the Mesozoic Era, and all had a similar-looking snout. The front of the jaws meet in a U-shape to support a cupped beak used for cropping plants. The beak of some species is broader than in others, but there was no evidence of a significantly different shape and therefore likely also different feeding style in duckbills until Aquilarhinus was discovered. The lower jaws of Aquilarhinus meet in a peculiar W-shape, creating a wide, flattened scoop. Around 80 million years ago, this particular dinosaur would have been shovelling through loose, wet sediment to scoop loosely-rooted aquatic plants from the tidal marshes of an ancient delta, where today lies the Chihuahuan desert. The jaw and other characteristics of the specimen show that it does not fit with the main group of duck-billed dinosaurs known as Saurolophidae, researchers said. It is more primitive than this group, suggesting there might have been a greater number of lineages than previously recognised that evolved before the great radiation that gave rise to the bewildering array of unadorned, solid and hollow-crested forms. Aquilarhinus sported a simple bony crest, one shaped like a humped nose, researchers said.last_img read more

Read More

Mahinda to be issued notice by commission

Referring to the allegations levelled against her by the Opposition that she has no mandate to ask the former President to come to the Bribery Commission for a statement, Wickramasinghe stated that each and every citizen of this country irrespective of their status or positions is equal before the law of the land. Wickramasinghe said that the delay in getting the statements from the former President and MP Attanayake was not due to certain opposition parliamentarians’ agitation in the parliament but due to a number of government holidays in the month of May. Wickramasinghe further said that the Speaker of the parliament has no authority to summon a public servant to Parliament to be questioned.The Speaker had summoned Wickramasinghe after notice was issued on the former President earlier but she was out of the country at the time so the Chairman of the Commission was summoned instead. The Bribery or Corruption commission is to issue notice on former President Mahinda Rajapaksa to appear before the commission despite recent protests in Parliament and outside.Director General of the Bribery Commission, Dilrukshi Dias Wickramasinghe has told The Sunday Leader newspaper that the former President and former Health Minister Tissa Attanayake’s impending interrogation has not been withheld, but will be carried out shortly. “If the parliamentarians think that the law of this land cannot be imposed on rich and powerful but only against poor and frail then it is up to the legislative council that should pass that law. So then I can investigate the complaints made only against the poor and frail not the rich and powerful,” Wickramasinghe said.According to Wickramasinghe in the event the Commission receive complaints, the Commission will follow the normal procedure to find out whether there is concrete evidence to carry out further investigations or not which is decided by the three Commissioners including the Commission Chairman but not the Director General. read more

Read More