Giant killer crocs ruled the seas 150m yrs ago
Washington: A more than 22-foot-long crocodile that ripped prey to death and a huge croc that sucked prey to its doom were at the top of the European marine food chain 150 million years ago, a new study has found.
The enormous prehistoric crocodiles, Plesiosuchus and Dakosaurus, were such voracious carnivores that their methods have been compared to today’s killer whales and a famous, iconic, meat-loving dinosaur.
“The skulls of these two sea croc species have some similarities to T. rex,” Discovery News quoted lead author Mark Young, from the University of Edinburgh, as saying.
“The largest known skull of Plesiosuchus manselii was approximately four feet, three inches long, putting it in the size range of adult T. rex skulls,” he said.
For the study, Young and his colleagues analyzed fossils for the two crocodiles, which were unearthed in sites from England to Germany.
In their U.K. home, the crocs once dwelled in the shallow seas that covered England. At the same time, Archaeopteryx was flying over Europe and giant dinosaurs, such as Diplodocus and Allosaurus, were stomping around North America.
The researchers determined that Plesiosuchus was the largest known species of metriorhynchid, meaning sea crocodile.
“It was bigger than living salt water crocodiles and great white sharks,” Young said.
Its teeth functioned like those of today’s killer whales, based on shape and wear. This ripper crocodile probably bit into both large and small prey, which it would grab, kill and gulp.
Perhaps even more unusual was the sucker croc, Dakosaurus. The skull and jaw characteristics of this nearly 15-foot-long ancient crocodile suggest that it was a suction feeder, making it the first known suction-feeding crocodilian.
This way of eating “involves being able to rapidly open the mouth wide, and generating negative pressure,” Young said.
“This sucks a prey item into the mouth,” he said.
Therefore, both the prehistoric crocodiles fed very similar to modern killer whales. These animals are not related, since killer whales are mammals. The researchers instead believe that the similarities exemplify what’s known as convergent evolution.
“Convergence is the evolution of a similar body plan, feeding mechanism (or other characteristic or behaviour) in two different and not closely related groups, in this case crocodiles and mammals,” Young said.
“The continual evolution of these morphologies in distantly related groups could be telling us something about the limits and optimal method of underwater feeding in vertebrates.
“For example, the shearing, tooth-to-tooth occlusion of Dakosaurus is today found in false killer whales. But over the past 10 million years, numerous species of fossil sperm whales also evolved this feeding mechanism,” he added.
The study has been published in PLoS ONE.
More from India
More from World
More from Sports
More from Entertaiment
- Trump-Sharif conversation: Team Donald denies Pakistan's claims
- Rahul Gandhi's and Congress' Twitter accounts hacked: Who's behind it?
- Rahul Gandhi's Twitter handle hacked again
- Hizbul commander Musa issues threats of attacks in new video
- Panel discussion over Mamata Banerjee's false allegations on Indian Army for political gains
- Gujarat businessman declares highest ever black money amount – Rs 13,000 crore!
- Army proves Mamata Banerjee wrong, releases letter showing West Bengal govt knew of exercise
- Rs 4.7 crore cash in Rs 2000 notes! Biggest seizure in new currency post demonetisation - What I-T recovered from Bengaluru, Chennai and Erode
- Manohar Parrikar exposes Mamata's attempt to politicise routine Army exercise in Kolkata
- Scam? 'Aam Aadmi Party using Delhi Transport Corporation to exchange Rs 500, Rs 1,000 notes'