Ai-Ai delas Alas on Jiro Manio: ‘Sana pinahalagahan niya ang naitulong ko’ Thousands join Kalibo Ati-atihan despite typhoon devastation LSU title parade draws massive crowds Sports Related Videospowered by AdSparcRead Next Filipinos turn Taal Volcano ash, plastic trash into bricks PLAY LIST 01:40Filipinos turn Taal Volcano ash, plastic trash into bricks01:32Taal Volcano watch: Island fissures steaming, lake water receding02:14Carpio hits red carpet treatment for China Coast Guard02:56NCRPO pledges to donate P3.5 million to victims of Taal eruption00:56Heavy rain brings some relief in Australia02:37Calm moments allow Taal folks some respite Don’t miss out on the latest news and information. Defending champion Pocari Sweat and two other teams gun for win No. 2 when the Premier Volleyball League resumes Wednesday at Filoil Flying V Centre in San Juan.Pocari Sweat, which downed hard-fighting University of the Philippines last Sunday, will battle Perlas-BanKo, which is coming off a defeat at the hands of Air Force in the opener.ADVERTISEMENT Clippers, Lakers among most-watched NBA teams by Filipinos LATEST STORIES Trump invites Duterte again to visit US – this time for March summit Hats off to Sen. Manny: Was he honestly beaten? Missile-capable frigate BRP Jose Rizal inches closer to entering PH Navy’s fleet End of his agony? SC rules in favor of Espinosa, orders promoter heirs to pay boxing legend LaVine scores 42, Chicago rallies late to beat Cavs MOST READ View comments Tobias Harris’ late 3 seals Sixers’ win over Knicks Last conference’s finalist BaliPure and fan favorite Creamline will also attempt to notch a second victory as they lock horns in the other match.Pocari Sweat’s new coach, Rico de Guzman, said they still had many things to improve on, including service reception—which caused them trouble against the Lady Maroons.FEATURED STORIESSPORTSEnd of his agony? SC rules in favor of Espinosa, orders promoter heirs to pay boxing legendSPORTSRedemption is sweet for Ginebra, Scottie ThompsonSPORTSMayweather beats Pacquiao, Canelo for ‘Fighter of the Decade’But team captain Myla Pablo said she was confident her teammates would get around and summon the championship form that enabled them to win the league’s previous three titles.
520-million-year-old arthropod brains turn paleontology on its head © 2018 Phys.org The fossils are from Kerygmachela kierkegaardi, a type of sea creature that lived from approximately 521 to 514 million years ago. The creatures were approximately 25 centimeters in length, had large eyes and had 11 feather-shaped swimming flaps on their sides. They also had a long, thin tail, long twin appendages on their round heads, which they apparently used for grasping prey, and, as this new evidence shows, a single-segment brain. It is the brain that is newsworthy in this new effort—prior fossilized samples of Kerygmachela have been found before, but this is the first time that fossilized brains have been uncovered. The fossilized brains, the team notes, are made of thin carbon films.The team reports that they found 15 fossilized brains in all, some of which also had associated fossilized nervous system tissue. Because the brains had just one segment, it is assumed that they were less complex than those with three segments, suggesting limited behavioral attributes. These findings call into question the assumption that the common ancestor of all arthropods and vertebrates had three-segmented brains. But, the team also notes, despite having just one segment, the creature clearly had enough brain power to survive during the Cambrian explosion. They also note that the creature’s large eyes represent an intermediate evolutionary step between creatures with very simple eyes and those with eyes that are far more complex.The fossils were located at a site named Sirius Passet on the northern tip of Greenland. The researchers found them by canvassing shale plots on land and using hammers to crack apart layers of shale which had protected the fossils from the elements over millions of years, allowing for the preservation of the fossilize brains. The fossilized brains represent some of the oldest ever found. Journal information: Nature Communications More information: Tae-Yoon S. Park et al. Brain and eyes of Kerygmachela reveal protocerebral ancestry of the panarthropod head, Nature Communications (2018). DOI: 10.1038/s41467-018-03464-wAbstractRecent discoveries of fossil nervous tissue in Cambrian fossils have allowed researchers to trace the origin and evolution of the complex arthropod head and brain based on stem groups close to the origin of the clade, rather than on extant, highly derived members. Here we show that Kerygmachela from Sirius Passet, North Greenland, a primitive stem-group euarthropod, exhibits a diminutive (protocerebral) brain that innervates both the eyes and frontal appendages. It has been surmised, based on developmental evidence, that the ancestor of vertebrates and arthropods had a tripartite brain, which is refuted by the fossil evidence presented here. Furthermore, based on the discovery of eyes in Kerygmachela, we suggest that the complex compound eyes in arthropods evolved from simple ocelli, present in onychophorans and tardigrades, rather than through the incorporation of a set of modified limbs. This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only. Explore further Citation: Fossilized brains of ancient sea creatures found in northern Greenland (2018, March 19) retrieved 18 August 2019 from https://phys.org/news/2018-03-fossilized-brains-ancient-sea-creatures.html A team of researchers from Korea, the U.K. and Denmark has found fossilized brains of sea creatures that lived during the Cambrian explosion. In their paper published in the journal Nature Communications, the group describes features of the brains and why they believe their findings may overturn a commonly held belief about the ancestry of panarthropods and invertebrate panarthropods and also vertebrates. Reconstruction of Kerygmachela kierkegaardi. a Dorsal reconstruction of the head region with the central nervous system (orange), anterior neural projection (yellow), and muscular pharynx (blue). b Artistic reconstruction of K. kierkegaardi. el eye lobe, mo mouth opening, nap anterior neural projection, nb branching of nerve, nc nerve cord, nfa frontal appendage nervous tract, npc protocerebrum, nop optic nerve, phr pharynx. Artwork by Rebecca Gelernter (nearbirdstudios.com). Credit: Nature Communications (2018). DOI: 10.1038/s41467-018-03464-w