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Scientists Unveil Mystery Surrounding 500 Million-Year-Old Critter Without Anus_我的网站
A | 海上自衛隊呉資料館は2026年2月19日、ジャパンマリンユナイテッド（JMU）呉事業所にドック入りした護衛艦「かが」の写真を公式Xで公開しました。【画像】すごい迫力！これがドック入りした護衛艦「かが」です（潜水艦と大きさ比較も） 「かが」は、ヘリコプターを複数同時運用できる、いずも型護衛艦の2番艦として2017年に就役。 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.。海上自衛隊では最大級の戦闘艦艇で、広島県の呉を母港とする第4護衛隊群第4護衛隊に配備されています。
B | 2024年3月に第1回特別改造工事が完了し、ステルス戦闘機F-35Bを運用可能な軽空母となる予定です。改造前の「かが」の基準排水量は1万9500トン、全長248m、幅38m。
C | 公開された写真は、「かが」がドックにピッタリ収まった様子を捉えています。 海上自衛隊呉資料館は、過去に同じドックに入渠した潜水艦「あきしお」の写真も比較用に公開しており、「かが」と比べるとかなり小さいことがわかります。「あきしお」は基準排水量2300トン、全長76m、幅9.9mです。 ちなみに、JMU呉事業所は元々、史上最大の戦艦「大和」を建造した呉海軍工廠でした。「大和」は基準排水量6万4000トン、全長263m、幅38.9m。
D | 排水量（船の重さとほぼ同等）は「かが」の3倍以上あるものの、全長と幅はあまり変わりません。
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Published on:06:39:36