---
title: "California Sandcastle Worm"
description: "Phragmatopoma californica — Inne zwierzęta. Phragmatopoma californica, commonly known as the sandcastle worm, the honeycomb worm or the honeycomb tube worm, is a reef-forming marine polychaete worm belonging to the family Sabellarididae."
canonical: https://animalchecklist.com/pl/animal/california-sandcastle-worm
last_updated: 2026-09-20
---

# California Sandcastle Worm

> Phragmatopoma californica — Inne zwierzęta. Phragmatopoma californica, commonly known as the sandcastle worm, the honeycomb worm or the honeycomb tube worm, is a reef-forming marine polychaete worm belonging to the family Sabellarididae.

- Scientific name: *Phragmatopoma californica*
- Category: `other` (Inne zwierzęta)
- Habitats: `sea` (Morze i wybrzeże)
- iNaturalist observations: 3810
- Wikidata: [Q2520559](https://www.wikidata.org/wiki/Q2520559)
- iNaturalist taxon: [59635](https://www.inaturalist.org/taxa/59635)

## Names

- en: California Sandcastle Worm
- es: Gusano Castillo de Arena

## Countries with the most observations

US (3327), MX (45)

## Summary

Phragmatopoma californica, commonly known as the sandcastle worm, the honeycomb worm or the honeycomb tube worm, is a reef-forming marine polychaete worm belonging to the family Sabellarididae. It is dark brown in color with a crown of lavender tentacles and has a length of up to about 7.5 centimeters (3.0 in). The worm inhabits the Californian coast, from Sonoma County to northern Baja California.
Sandcastle worms live in colonies, building tube reefs somewhat similar to sandcastles (hence the name), which are often seen on rocky beaches at medium and low tide. The sandcastles, which have a honeycomb-like outward…

Text: Wikipedia (en), CC BY-SA 4.0 — https://en.wikipedia.org/wiki/Phragmatopoma_californica

## Photo

![California Sandcastle Worm](https://animalchecklist.com/img/animals/california-sandcastle-worm/medium.jpg)

Photo: Diego Blanco · CC0 · inaturalist — https://www.inaturalist.org/observations/268012611

## Machine access

`GET https://animalchecklist.com/api/v1/animals/california-sandcastle-worm?lang=pl` — see [openapi.json](https://animalchecklist.com/openapi.json).