Hike 26: カブトエビ Triops


最近の嵐で、色々な所に水溜りができています。「スノーキャニオン州立公園にカブトエビがいたよ。」とバンちゃんが教えてくれたので、早速連れて行ってもらいました。 The recent storms created many puddles throughout the red rock areas. “I found many Triops in several puddles at Snow Canyon State Park!” said Banchan. So we decided to go Triops hunting at the place he saw a few weeks before.

パドレ渓谷トレイルを少しそれると、幾つも水溜りができていました。そして、いた! We found many puddles off from the Padre Canyon trail. And… Yes! They were there!

カブトエビには無数の足の様なものがあります。 Triops have many layers of leg like things on the sides.

また、カブトエビには目が三つあります!以下の巨大拡大した写真を見ると、二つの眼の間に薄紫色の部分があります。そこが三つめの目です。Another interesting feature of Triops is that it has three eyes. See the below enlarged picture. You can see two eyes in black. In between of them, you also find a light purple colored section. That is the third eye.

3億年前の石炭期からほとんど進化していない形を保っているそうです。5億年まえに生きていた三葉虫に似てますが、三葉虫は絶滅しているので、全く関係はないというのが目下の説です。 Triops have kept the same shape for 300 million years. We know Trilobites, which lived 500 million years ago, are similarly shaped to Triops. However, scientists think there is no relationship between them.

孵化してから10日で卵を産み、その後、50日間生きて死んでいきます。 Triops lay eggs 10 days after hatching, then die in 50 days.

水溜りの底に産み付けられた卵は、水があれば2-3日で孵化するそうですが、水溜りがすっかり枯れてしまうと、休眠状態に入ります。温度が高くても低くても、何十年も休眠し続けることができます。これが3億年も前から氷河期も生き延びて来た理由だと言われています。まさに生きている化石です。 The eggs they laid at the bottom of the pool could hatch in 2-3 days as long as they are in water, but if the water dries out completely, the eggs enter into a dormant state. Regardless of the temperature, they can stay in dormant for many many years. And scientists say this is the key factor for why they could survive for 300 million years including through ice ages. They are indeed the living fossils.

以下、カブトエビのビデオです。 This is a video of Triops.

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