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PBS地球-动物趣

Either way, the Paleozoic Era continued to be dominated by the crinoids and other echinoderms.

无论哪种方式,古生代合和其他棘皮动物统治。

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PBS地球-动物趣

Paleontologists wonder whether the ability to move around might've helped starfishes fare better than the stationary crinoids did.

古生物学家想知道四处移动的能力是否比静止的合更能帮助星生存。

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If anything, the eocrinoids and crinoids with stalks were moving away from the low-profile body plan of a starfish.

如果说有什么不同的话,那就是带有茎的合和合正在远离星低调的体计划。

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PBS地球-动物趣

It looks like some of the crinoids might've taken a different approach to feeding - instead of staying face-up suspension feeders, they went face-down.

看起来有些合可能采取了不同的进食方式——它们不再是面朝上的悬浮式喂食器,而是面朝下。

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Modern starfishes move using their tube feet in a way that's similar to what crinoids do to waft food into their mouths.

现代星使用管脚移动,其方式类似于合将食物送入嘴中的方式。

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Crinoids became the most abundant echinoderms of the Ordovician, and some were the ancestors of today's stalkless feather stars and stalked sea lilies.

合成为奥陶纪最丰富的棘皮动物,有些是今天无柄羽星和有柄合的祖先。

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And crinoids are still around, too, but their species number in the 600s, in contrast to the 6000 known species that've lived throughout Earth's history.

合也仍然存在,但它们的物种数量只有 600 种,而地球历史上已知的物种数量为 6000 种。

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Sea levels were high, and the continents were surrounded by vast, shallow seas, full of exotic creatures like rugose corals, crinoids, and jawless fish.

平面很高,大陆被广阔的浅包围,充满了奇异的生物,如长皱纹珊瑚、合和无颌鱼。

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Including the similar-looking and closely related group - the crinoids, also called sea lilies - which showed up and diversified into many species with different suspension-feeding body types.

包括外观相似且密切相关的群体——合,也称为合——它们出现并多样化为许多具有不同悬浮喂养体型的物种。

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But we still need more fossil evidence to help us figure out whether Cantabrigiaster really was a transitional animal between crinoids and sea stars or not.

但是我们仍然需要更多的化石证据来帮助我们弄清楚 Cantabrigiaster 是否真的是合和星之间的过渡动​​物。

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But starfishes and their skinny-armed cousins called the brittle stars made it through, along with a few crinoids, sea cucumbers, and sea urchins – the groups we still see today.

但是星和它们被称为蛇尾的瘦臂表亲以及一些合、参和胆——这些我们今天仍然能看到的群体——成功了。

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So, as odd as the starfish body plan seems, something about it was successful -- from their ancient bilateral ancestors, to the radial crinoids with their upward-facing arms, to the predatory, downward-facing starfish.

因此, 尽管星的体计划看起来很奇怪,但它的某些方面是成功的——从它们古老的双侧祖先,到手臂朝上的放射状合,再到捕食性的、面朝下的星。

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