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

A worldwide community photographing and learning about wildlife

Join Project Noah!
nature school apple icon

Project Noah Nature School visit nature school

Sandcastle worm colony

Phragmatopoma californica


These honeycombed structures are the result of the worms creating tubes that are glued together. A fascinating animal architecture. The worms are rarely seen and have a length of about 3 inches.


Spotted at the Point Loma Tide Pools in San Diego, California. The shore is rocky with sandstone cliffs nearby see pic 3. The worm inhabits the Californian coast, from Sonoma County to northern Baja California.

Species ID Suggestions

Sign in to suggest organism ID

No Comments

Spotted by

San Diego, California, United States

Spotted on Nov 18, 2021
Submitted on Nov 26, 2021

Nearby Spottings

California sea hare Giant spined star Golden snake cactus Spotting
Noah Guardians
Noah Sponsors
join Project Noah Team

Join the Project Noah Team