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f a pterosaur was found back in 1873 ferris jabr has posted a picture pterosaur wings share this share on facebook opens in new window facebook share on x opens in new window x email a link to a friend opens in new window email print opens in new window print more share on reddit opens in new window reddit like loading posted in evolution science tags fossils history of science leave a comment placoderms evolved penetrative sex december 11 2013 monado placoderms are an extinct class of armoured fishes containing several orders placoderm comes from greek words for plate and skin they are jawed fishes but so ancient that they precede both sharks rays and bony fishes some elements of the skeleton are cartilaginous while others are bony and there are bony elements in their skin armour yes bones and teeth are derived from skin tissue they appeared in the fossil record about 420 ma in the early silurian and by 400 ma in the devonian all major placoderm orders were present see australia the land where time began placoderms from wikipedia before placoderms all fertilization of eggs by sperm occurred outside the body as females released eggs and males released sperm into the water they might hover near each other but if sperm found egg it was partly by chance female fishes release their eggs through a cloaca an opening for both eggs and bodily wastes as the fish that were closest had the most success eventually males began to position themselves at the cloaca one group of placoderms the ptyctodontids have these external claspers to hold the female as do sharks the pelvic fin perhaps developed a tube shape to funnel the male s sperm into the female s cloaca some modern fish mate in this way what is known is that some placoderms gave birth to live young which means that that at the very least eggs were fertilized while still in the female in short these early fishes invented internal fertilization rhamphodopsis threiplandi a placoderm with claspers from wikipedia there are two pathways after internal fertilization one is ovivipary where eggs are retained and hatch inside the mother who then expels the young some sharks still do that in fact in some sharks the first young to hatch eat the other eggs to nourish themselves until birth females may develop areas of nourishing skin that the young can scrape off the other main path is for the young the female to cooperatively grow a placenta which attaches to the her and extracts nourishment from her blood placentas could not have happened without a retrovirus inserting itself into the genome but that s another topic at first scientists thought that young placoderms inside larger fossils could have been evidence of predation but at last a tiny fossil placoderm was found with a tiny umbilical cord still attached to the mother share this share on facebook opens in new window facebook share on x opens in new window x email a link to a friend opens in new window email print opens in new window print more share on reddit opens in new window reddit like loading posted in biology evolution science tags deep time evolution fishes fossils sex 3 comments pterosaurs over the sahara july 27 2012 monado i know i m mixing up times and environments here s the real news a fossil pterosaur has been found in the sahara desert it has a wingspan of about five metres the fossil comprises most of the bones of one wing and a number of long slender teeth which indicate a fish catching habit share this share on facebook opens in new window facebook share on x opens in new window x email a link to a friend opens in new window email print opens in new window print more share on reddit opens in new window reddit like loading posted in africa evolution science tags fossils new fossils leave a comment date of first walker pushed back 30 million years june 29 2012 monado a tiny trackway discovered in sedimentary rock has pushed back the date of the first organism capable of walking to 585 million years ago this proof is 30 million years older than previously known evidence it took two years to precisely date the trackway by radiometric dating of igneous rock that intruded into the sedimentary rock the fossil was found in uruguay the organism was about the size of a grain of rice a trackway like this shows that it had front and back ends and was bilaterally symmetrical with limbs that could move it forward we could call it first explorer see also study resets date of earliest animal life by 30 million years share this share on facebook opens in new window facebook share on x opens in new window x email a link to a friend opens in new window email print opens in new window print more share on reddit opens in new window reddit like loading posted in biology evolution science tags deep time evolution fossils invertebrates 2 comments transitional fossils halfway flat fish august 28 2011 monado national geographic s 2009 roundup of transitional fossils included a fish that is evolving to lie concealed on the ocean floor modern flatfish are born symmetrical with eyes an other side of their head but as they age one eye moves around to the other side so that the fish can watch for danger with both eyes while lying flat on the sea floor the lack of halfway forms has been used to argue against evolution now one has been found this one appears to have one eye just over the midline i wait for anti evolutionists to acknowledge that the theory of evolution has been confirmed once again amphistium transitional fossil a half way flat fish amphistium a transitional fossil in flatfish evolution share this share on facebook opens in new window facebook share on x opens in new window x email a link to a friend opens in new window email print opens in new window print more share on reddit opens in new window reddit like loading posted in biology evolution pseudoscience science tags evolution fossils transitional fossils leave a comment even older fossils at 3 4 billion years august 23 2011 monado fossil bacteria fossil bacteria from 3 4 billion years ago are the world s oldest fossils the microfossils were found in a remote part of western australia called strelley pool they are very well preserved between the quartz sand grains of the oldest beach or shoreline known on earth in some of the oldest sedimentary rocks that can be found anywhere they are from a billion years before plants generated our oxygen atmosphere the fossils are very clearly preserved showing precise cell like structures all of a similar size they look like well known but much newer microfossils from 2 billion years ago and are not odd or strained in shape the fossils suggest biological like behaviour the cells are clustered in groups are only present in appropriate habitats and are found attached to sand grains and crucially they show biological metabolisms the chemical make up of the tiny fossilised structures is right and crystals of pyrite fool s gold associated with the microfossils are very likely to be by products of the sulphur metabolism of these ancient cells and bacteria update jerry coyne has more details and more photos about these fossils they may be primitive single celled organisms rather than bacteria newly found the world s oldest fossils larry moran explains the biochemistry that tells us these bacteria digested sulphur in the oldest cells share this share on facebook opens in new window facebook share on x opens in new window x email a link to a friend opens in new window email print opens in new window print more share on reddit opens in new window reddit like loading posted in biology evolution science tags fossils microbiology leave a comment adventures in science june 8 2011 monado sean b carroll s book remarkable creatures is about major discoveries in evolution he glides over a few details but it s very readable i d like to see each chapter done as a book about the exciting history of science for young people i m learning things i never knew that charles doolittle walcott in addition to discovering the burgess shale with its cambrian explosion fauna surveyed 25 000 vertical feet of geological strata over two seasons was one of the first 20 employees of the u s geological service found the first precambrian fossils consulted in the passing of the antiquities act to protect significant sites e g grand canyon and the founding of the national park service drafted the bill that created the national forest reserves secured a museum building to house the national museum later the smithsonian was a science adviser to several u s presidents raised the money from private donors to have 12 000 specimens from roosevelt s african expedition preserved and shipped back to the u s discovered hundreds of thousands of fossils during summer field expeditions with his family brought the wright brothers official recognition for their work and helped to found the national advisory committee for aeronautics which became nasa share this share on facebook opens in new window facebook share on x opens in new window x email a link to a friend opens in new window email print opens in new window print more share on reddit opens in new window reddit like loading posted in americas books evolution tags evolution fossils geology research u s leave a comment beautiful fossil in alberta march 31 2011 monado piece of ankylosaurus fossil a sharp eyed oil field worker noticed something odd about the rocks where he was clearing away soil in advance of construction he stopped his digging machine pictures were taken and sent to the royal tyrrell museum they sent an expert who identified the fossil as an ankylosaurus it s about 40 million years older than most alberta dinosaurs it might be the oldest most complete fossil ever found in alberta 113 myo perfect 3 d ankylosaurus update you can read more about the find at everything dinosaur share this share on facebook opens in new window facebook share on x opens in new window x email a link to a friend opens in new window email print opens in new window print more share on reddit opens in new window reddit like loading posted in americas evolution tags canada dinosaurs fossils leave a comment older posts proudly powered by wordpress search for the out campaign atheism is a religion like not collecting stamps is a hobby penn jillette if atheism is a religion then bald is a hair color mark schnitzius if atheism is a religion then health is a disease clark adams archives archives select month march 2025 1 october 2023 1 june 2017 1 march 2017 1 december 2016 1 july 2016 1 november 2015 1 october 2015 1 february 2015 2 january 2015 5 december 2014 5 november 2014 1 october 2014 2 september 2014 1 august 2014 1 july 2014 2 june 2014 3 january 2014 3 december 2013 3 november 2013 3 october 2013 1 september 2013 1 august 2013 1 july 2013 1 june 2013 1 may 2013 1 april 2013 1 march 2013 1 february 2013 1 january 2013 2 december 2012 2 november 2012 3 october 2012 3 september 2012 6 august 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