---
title: "Giant Floater"
description: "Pyganodon grandis — Andere dieren. Pyganodon grandis, or the giant floater, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels."
canonical: https://animalchecklist.com/nl/animal/giant-floater
last_updated: 2026-09-20
---

# Giant Floater

> Pyganodon grandis — Andere dieren. Pyganodon grandis, or the giant floater, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels.

- Scientific name: *Pyganodon grandis*
- Category: `other` (Andere dieren)
- Habitats: `freshwater` (Meren en rivieren)
- iNaturalist observations: 9588
- Wikidata: [Q3795937](https://www.wikidata.org/wiki/Q3795937)
- iNaturalist taxon: [130983](https://www.inaturalist.org/taxa/130983)

## Names

- en: Giant Floater
- fr: Grand anodonte

## Countries with the most observations

US (6022), CA (2605)

## Summary

Pyganodon grandis, or the giant floater, is a species of freshwater mussel, an aquatic bivalve mollusk in the family Unionidae, the river mussels. This species is fast-growing, large, and has a short lifespan. It is variable and widespread across the United States and southeastern Canada. 
Original description (Say 1829): "Shell very large, subovate; disk unequally wrinkled and undulated transversely, dark yellowish brown; umbo elevated; beak slightly elevated, with generally, two or three small sinuous, acute undulations; hinge margin slightly arquated, sometimes nearly rectilinear, somewhat angulated at its anterior…

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

## Photo

![Giant Floater](https://animalchecklist.com/img/animals/giant-floater/medium.jpg)

Photo: Michael Naumoff · CC0 · inaturalist — https://www.inaturalist.org/observations/113158197

## Machine access

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