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The 15 pages that link to Sea urchin, each with the reason it gives.

• Kelp forestRelated: Dense urchin grazing can remove kelp and transform forest habitat.

• GastrulationRelated: Its gastrulation is a canonical example of archenteron formation by cell rearrangement and ingression.

• Sea otterRelated: Sea urchins are major sea otter prey and can overgraze kelp when predators are scarce.

• EchinodermBroader topic: Sea urchins graze algae and use a distinctive jaw apparatus called Aristotle’s lantern.

• Sea cucumberCompared with: Its hard test contrasts with the flexible, elongated sea cucumber body.

• GizzardBroader topic: Its complex chewing apparatus processes food before it reaches the digestive tract.

• KelpRelated: Large urchin populations can overgraze kelp and create persistent barrens.

• SeaweedRelated: Large urchin populations can overgraze kelp and transform coastal habitat.

• Brittle starCompared with: Its compact, spine-covered body contrasts with the brittle star's distinct disc and flexible arms.

• StarfishCompared with: Sea urchins share the echinoderm body plan but lack the starfish’s prominent arms.

• ParrotfishCompared with: Sea urchins also control reef algae, but graze with teeth arranged in Aristotle’s lantern.

• PorcupinefishRelated: Sea urchins are among the hard-bodied prey eaten by some porcupinefish.

• Tim HuntRelated: Hunt observed cyclin fluctuations in sea urchin eggs after fertilization.

• Strongylocentrotus purpuratusNarrower topic: S. purpuratus is one species within this group of spiny marine invertebrates.

• TestRelated: The animal’s test is the rigid case supporting its spines and body.