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Pluteus larvae - The larva looks like a little pyramid or an arrow. This larval stage is called Pluteus. Note that larvae don't swim in the direction of the 'arrow' but with the mouth in front. The oral arms probably helps to conduct food towards the mouth | Der Pluteus ist eine Larvenform der Stachelhäuter (Echinodermata), die in der Individualentwicklung (Ontogenese) der Seeigel (Echinoida) sowie der Schlangensterne (Ophiuroida) auftritt.

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Solvin Zankl
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Pluteus larvae - The larva looks like a little pyramid or an arrow. This larval stage is called Pluteus. Note that larvae don't swim in the direction of the 'arrow' but with the mouth in front. The oral arms probably helps to conduct food towards the mouth | Der Pluteus ist eine Larvenform der Stachelhäuter (Echinodermata), die in der Individualentwicklung (Ontogenese) der Seeigel (Echinoida) sowie der Schlangensterne (Ophiuroida) auftritt.