Paracrinoidea

Rarity: Common

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At a glance

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Knowledge cost

2

Influence

2

Resistance

4

In collections

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What Wikipedia says

Paracrinoidea is an extinct class of blastozoan echinoderms. They lived in shallow seas during the Early Ordovician through the Early Silurian. While blastozoans are usually characterized by types of respiratory structures present, it is not clear what types of respiratory structures paracrinoids likely had.

Excerpt from the Wikipedia article “Paracrinoidea”, under the CC BY-SA 4.0 license. Read the article on Wikipedia

Image: Jstuby at English Wikipedia, Public domain, via Wikimedia Commons.