---
title: "Swamp Crab Spider"
description: "Xysticus ulmi — Owady i pająki. Xysticus ulmi, the swamp crab spider, is a European crab spider of the family Thomisidae which prefers damp habitats."
canonical: https://animalchecklist.com/pl/animal/swamp-crab-spider
last_updated: 2026-09-20
---

# Swamp Crab Spider

> Xysticus ulmi — Owady i pająki. Xysticus ulmi, the swamp crab spider, is a European crab spider of the family Thomisidae which prefers damp habitats.

- Scientific name: *Xysticus ulmi*
- Category: `insects` (Owady i pająki)
- Habitats: unknown
- iNaturalist observations: 4800
- Wikidata: [Q140543](https://www.wikidata.org/wiki/Q140543)
- iNaturalist taxon: [496641](https://www.inaturalist.org/taxa/496641)

## Names

- en: Swamp Crab Spider
- de: Sumpfkrabbenspinne
- nl: Moeraskrabspin

## Countries with the most observations

RU (973), DE (480), FR (351), PL (312), DK (264), FI (207), GB (193), AT (119), SE (105), BE (95), UA (80), LT (73)

## Summary

Xysticus ulmi, the swamp crab spider, is a European crab spider of the family Thomisidae which prefers damp habitats. It was first described by the German zoologist Carl Wilhelm Hahn in 1831.

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

## Photo

![Swamp Crab Spider](https://animalchecklist.com/img/animals/swamp-crab-spider/medium.jpg)

Photo: Liubov Ilminska · CC0 · inaturalist — https://www.inaturalist.org/observations/117733069

## Machine access

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