---
title: "Fat Innkeeper Worm"
description: "Urechis caupo — Altri animali. Urechis caupo is a species of spoon worm in the family Urechidae, commonly known as the innkeeper echiuran, the fat innkeeper worm (because their tunnels often contain other animals), the innkeeper worm, or the penis fish."
canonical: https://animalchecklist.com/it/animal/fat-innkeeper-worm
last_updated: 2026-09-20
---

# Fat Innkeeper Worm

> Urechis caupo — Altri animali. Urechis caupo is a species of spoon worm in the family Urechidae, commonly known as the innkeeper echiuran, the fat innkeeper worm (because their tunnels often contain other animals), the innkeeper worm, or the penis fish.

- Scientific name: *Urechis caupo*
- Category: `other` (Altri animali)
- Habitats: `sea` (Mare e costa)
- iNaturalist observations: 191
- Wikidata: [Q2242916](https://www.wikidata.org/wiki/Q2242916)
- iNaturalist taxon: [117583](https://www.inaturalist.org/taxa/117583)

## Names

- en: Fat Innkeeper Worm
- de: Kalifornischer Igelwurm
- es: Gusano posadero

## Countries with the most observations

US (143)

## Summary

Urechis caupo is a species of spoon worm in the family Urechidae, commonly known as the innkeeper echiuran, the fat innkeeper worm (because their tunnels often contain other animals), the innkeeper worm, or the penis fish. It is found in shallow water on the west coast of North America, between southern Oregon and Baja California, where it forms a U-shaped burrow in the sediment and feeds on plankton using a mucus net.

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

## Photo

![Fat Innkeeper Worm](https://animalchecklist.com/img/animals/fat-innkeeper-worm/medium.jpg)

Photo: Alex Heyman · CC0 · inaturalist — https://www.inaturalist.org/observations/102639623

## Machine access

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