Votre Forum

Identifiez-vous avec le pseudo d'administration pour configurer et personaliser votre forum.

Vous n'êtes pas identifié.

#1 22-03-2018 02:41:46

Date d'inscription: 18-03-2018
Messages: 15

Lyrarapax was much smaller

A side-by-side comparison reveals the similarity between the brain of a living onychophoran (L) and that of the anomalocaridid fossil of a Lyrarapax unguispinus Luol Deng Jersey , as seen in an undated handout illustration courtesy of the University of Arizona. REUTERSNicholas StrausfeldUniversity of ArizonaHandout via Reuters An artist's impression of a Lyrarapax unguispinus, one of the species of the world's first predators, the anomalocaridids, chasing primitive fishes that also existed in the Lower Cambrian Period Lonzo Ball Jersey , is seen in this undated handout illustration courtesy of the University of Arizona. Researchers on July 16, 2014 described fossilized remains unearthed in China showing in fine detail the brain structures of a bizarre group of sea creatures that were the top predators more than half a billion years ago.
Researchers on Wednesday described fossilized remains unearthed in China showing in fine detail the brain structures of a bizarre group of sea creatures that were the top predators more than half a billion years ago.

The fossils show an animal called Lyrarapax unguispinus that lived during the Cambrian Period, a pivotal juncture in the history of life on Earth when many major animal groups first appeared. It was a member of a group known as anomalocaridids - primitive relatives of arthropods, which include crustaceans Larry Nance Jr. Jersey , insects and spiders - that hunted prey with a pair of claw-like grasping appendages in front of the eyes.

Even though anomalocaridids do not have any direct descendants alive today, the brain structures of Lyrarapax closely resemble those of worm-like animals called velvet worms that crawl along the ground in tropical and semitropical forests in the Southern Hemisphere.

The researchers said the similarities suggest that velvet worms may be very distant cousins of the anomalocaridids, whose best-known example is Anomalocaris, known from a Canadian fossil site called the Burgess Shale.

Velvet worms Larry Nance Jersey , land animals also known as onychophorans, grow to a few inches in length, have two long feelers extending from the head and have numerous pairs of stubby, unjointed tubular legs that each end in a pair of small claws.

Lyrarapax Kurt Rambis Jersey , whose scientific name means spiny-clawed, lyre-shaped predator, lived 520 million years ago. Its neuroanatomy resembles that of velvet worms in multiple ways, with a simple brain and a pair of ganglia – a cluster of nerve cells – placed in the front of the optic nerve and the base of the grasping appendages.

The soft parts of any animal's body typically decay after death Kobe Bryant Jersey , meaning that fossils usually preserve only hard parts like bones, teeth and shells. But under exceptional circumstances, soft tissue and anatomical organs can be preserved in fossils.

Lyrarapax was much smaller than some other anomalocaridids. It measured about 6 inches (15 cm) long, roughly the size of a large shrimp. Peiyun Cong Julius Randle Jersey , a paleontologist at Yunnan University in China, said the three specimens of Lyrarapax that were found "may represent immature stages of the animal, so it might be larger."

"Anomalocaridids preserved with the whole body are very rare. None of them have been reported with the brain," Cong said.

The fossils show that anomalocaridids possessed brains that were less complex than those of animals it may have hunted.

University of Arizona neuroscientist Nicholas Strausfeld Jose Calderon Jersey , another of the researchers, said the threat posed by predators like these creatures may have helped drive brain complexity among animals in the ancient seas.

"Predation may have in part contributed to the evolution of more elaborate brains that could process more complex ecological cues that might have offered camouflage or other protection," Strausfeld said.

The study was published in the journal Nature.


Seth and Jim certainly have experience. They fulfill their contracts purposely striving to come in on or under budget and on time. Seth and Jim possess expertise in retail and tenant finish construction, site development and ground-up construction. They know how to save their clients money while maintaining the quality of a project. And they have more experience in fast-track construction than probably firm in Georgia. But they also possess something unique that only a select few firms in the country have. They have a great deal of experience in working with television celebrities Jordan Clarkson Jersey , especially in the area of televised hyper speed construction!

Besides a love of building things, Jim and Seth share a love of antiques and history. And it was this shared interest that first got them on television. They appeared on the Discovery Channel program "Auction Kings". Seth was also on another antique auction show filmed in Roswell, Georgia when he came to auction a head hunting hatchet from the Philippines.

In 2012 the producers of the Arts & Entertainment network show "Drill Team" were coming to Atlanta to film an episode with the show’s celebrity designer. They needed a professional commercial contracting firm that also had experience in residential construction. The powers that be found Chandlee and Sons Construction through an internet search. After talking with Seth, the producers hired these commercial builders for a custom kitchen remodel project.

Jim and Seth now had their foot in the door with A&E. In early 2013 they were once again hired by their executives Jerry West Jersey , but this time it was for the fast-track reality construction show "Sell This House: Extreme" with the celebrity team of construction expert, host and designer. The production crew and celebrity team were in Atlanta to film two back-to-back episodes in separate locations.
Now Seth is a fast worker and Jim can surely think on his feet, but this show is designed to take it up a notch as Jim and Seth quickly learned. A. Cheap Jerseys   Cheap NFL Jerseys   Cheap Nike NFL Hoodies   Cheap Basketball Hoodies   Cheap Hockey Hats   Cheap NCAA Hats China   Wholesale Jerseys   Cheap College Hats Free Shipping   Wholesale Jerseys Free Shipping   Cheap NBA Basketball Jerseys

Hors ligne


Pied de page des forums

Créez Votre Propre Forum
Insérer vos Graphiques
Dictionnaires de Traduction
Hébergé par ForumCrea.com