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Scientists Unveil Mystery Surrounding 500 Million-Year-Old Critter Without Anus_我的网站

A |     Researchers from China and the UK have solved the mystery surrounding Saccorhytus coronaries – a millimeter-long spiny creature that was found in 2017 and believed to have inhabited oceans 500 million years ago. The veil of mystery over the critter persisted for years, as the scientists could not locate the creature’s anus. Turns out – they should not have even tried.,The critter was originally determined to be a member of a deuterostomes group of animals - the ancestors to the modern vertebrates (including humans). However, scientists' latest research suggests that it actually belongs to another group called ecdysozoans – the predecessors of the modern spiders and various insects. As it turned out, the whole mishap happened over the creature's anus – or rather lack thereof.,Ecdysozoans normally have an anus and hence the critter was initially ruled not to belong to them. But, upon closer discovery using x-rays, scientists saw it resembles ecdysozoans internally more than the ancestors of the vertebrates.,Like them, Saccorhytus has a large mouth and also features tiny holes around it that served as bases for spines that kept the critter anchored in one place. Those holes also served as a source of confusion as they were originally believed to be gills – another mark of the proto-vertebrates.,'Ugliest I've Ever Seen': Fisherman Shares Pic of Mysterious Creature He Found in Australia29 June, 13:17 GMT,As to Saccorhytus' absence of anus, scientists are yet to find out what happened to it. One theory suggests that there was an even earlier representative of ecdysozoans that has not been discovered, but did not have an anus.,Another theory goes that Saccorhytus did not actually need one.,"It could be that it lost it during its own evolution - perhaps it didn't need one because it could just sit in one spot with one opening for everything," Emily Carlisle, one of the researchers, said.。    昨天上午，杭州市城管局发布消息：为方便有需要的车主停车避险，目前，杭州市范围内的城市道路公共停车泊位实施免费停放，恢复收费时间另行通知。需要提醒的是，台风影响期间，请大家将车辆优先停至地势高处，或封闭的室内停车场库，远离大树、广告牌、墙体下方、电线杆；停车时远离低洼路段、地下车库出入口、河道岸边、排水不畅区域，防止车辆被积水浸泡、淹没；停车时遇积水上涨、树木倒伏等险情，立即转移车辆；车辆停好后务必关好车窗天窗，拆除车外吸盘挂件，避免漆面受损。此外，全市景观照明设施（含表演类亮灯，不含功能性作用的景观灯）做临时停运关闭处理。待应急响应等级调整后，再行恢复。

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