Guardian Nature School Team Contact Blog Project Noah Facebook Project Noah Twitter

A global community of nature enthusiasts
photographing and learning about wildlife

Join Project Noah!
nature school apple icon

Project Noah Nature School visit nature school

Urchin beak


A sea urchins mouth have lips of soft tissue that also have small bony pieces embedded inside. Their mouth is found on the underside part of the urchin (also called the oral side) They also have teeth. These teeth act like jaws. There are five teeth in most sea urchins and they are part of the organ called Aristotle's lantern. The Aristotle’s lantern is the organ that chews and ingests food. This complex structure is composed of five jaws made up of calcium plates. The plates are connected by muscles. Creatures use their Aristotle's lantern, or mouths, to scrape algae off rocks and other surfaces, as well as biting and chewing prey. References:


Found it laying in shallow water near the shoreline

Species ID Suggestions

Sign in to suggest organism ID


TajSALDO 2 years ago

I guess you are right @Machi, Thanks for letting me know. I'll be updating this spotting soon.

Machi 2 years ago

Definitely an urchin beak.

Gaia80 2 years ago

It could be the remains of a starfish or some kind of sea urchin, but I really have no clue otherwise.

Single D
Single D 2 years ago

I don't know what this is either but I sure do like your spotting.

Spotted by

Palawan, Philippines

Spotted on Jul 4, 2019
Submitted on Jul 9, 2019

Noah Guardians
Noah Sponsors

Join the Project Noah Team Join Project Noah Team