KnowraSea urchinLinked fromLinked fromThe 15 pages that link to Sea urchin, each with the reason it gives.All 15Broader topic 2Related 8Narrower topic 1Compared with 4EchinodermBroader topic: Sea urchins graze algae and use a distinctive jaw apparatus called Aristotle’s lantern.GizzardBroader topic: Its complex chewing apparatus processes food before it reaches the digestive tract.