---
title: "Halloween Crab"
description: "Hartnollius quadratus — Andere dieren. Gecarcinus quadratus is a semi-terrestrial land crab from the family Gecarcinidae."
canonical: https://animalchecklist.com/nl/animal/halloween-crab
last_updated: 2026-09-20
---

# Halloween Crab

> Hartnollius quadratus — Andere dieren. Gecarcinus quadratus is a semi-terrestrial land crab from the family Gecarcinidae.

- Scientific name: *Hartnollius quadratus*
- Category: `other` (Andere dieren)
- Habitats: unknown
- iNaturalist observations: 3291
- Wikidata: [Q138194371](https://www.wikidata.org/wiki/Q138194371)
- iNaturalist taxon: [1632516](https://www.inaturalist.org/taxa/1632516)

## Names

- en: Halloween Crab
- de: Halloweenkrabbe
- es: Cangrejo de tierra de patas rojas
- fr: Crabe d’Halloween
- pl: Krab Halloween

## Countries with the most observations

CR (1726), MX (647), PA (262), NI (104), CO (64), SV (42), GT (30)

## Summary

Gecarcinus quadratus is a semi-terrestrial land crab from the family Gecarcinidae. Originally thought to be a subspecies of Gecarcinus lateralis, they are now recognized as separate species.
They are found in various locations across the Pacific and Atlantic coasts of the Americas.
Their unique colouration of oranges, yellows, purples, and black are one of the most notable features of G. quadratus, as well as the prominent markings along its carapace that help distinguish it from other crabs, specifically Gecarcinus lateralis. Usually ranging in sizes from around 2.7 to 5 cm (1 to 2 inches), females and males have…

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

## Photo

![Halloween Crab](https://animalchecklist.com/img/animals/halloween-crab/medium.jpg)

Photo: Scott Loarie · CC0 · inaturalist — https://www.inaturalist.org/observations/459988

## Machine access

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