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

一 |     网友在青岛拍到海市蜃楼，“山川云雾笼，仙境如画中”。海市蜃楼是近地面层气温变化大，空气密度随高度强烈变化，光线在铅直方向密度不同的气层中，经过折射进入观测者眼帘造成的结果。　　温馨提示　　近期青岛天气多变，市民需关注天气预报，及时增添衣物。

二 |     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.。对于易感人群，建议减少户外活动，以免受到天气变化的影响。此外，由于未来一周内青岛的天气以多云、晴为主，市民可充分利用阳光进行户外活动，但需注意防晒和补水。　　根据未来7天的天气情况，青岛的天气整体较为适宜出行。市民在享受美好天气的同时，也需关注天气变化，做好相应的防护措施。建议市民随身携带雨具，以应对可能出现的降雨天气。同时，关注空气质量预报，合理安排户外活动时间，保障身体健康。

三 | 　　（图源网络 中国小康网综合观海新闻、齐鲁壹点）。

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