Purple Pigtoe
ExploreInvertebrate
Purple Pigtoe
pustulosa succissa
The Purple Pigtoe is a remarkable freshwater mussel native to the pristine rivers and streams of the southeastern United States. Like other unionid mussels, it plays a vital role as an environmental biofilter, actively cleaning the water in its river ecosystems. These unassuming bivalves spend most of their long lives partially buried in sandy or gravelly riverbeds, quietly performing the essential task of maintaining aquatic health. Their fascinating reproductive cycle relies on a clever parasitic stage where microscopic larvae hitch a ride on the gills of specific host fish. This intricate connection makes them highly sensitive indicators of overall river health; finding a healthy population of Purple Pigtoe mussels is a strong sign of a clean, stable, and ecologically diverse river system.
Habitat: Found in medium to large rivers with moderate currents, typically resting in substrates of sand, gravel, or muddy sand.
Appearance
This medium-sized freshwater mussel features a solid, somewhat rounded or subquadrate shell, typically reaching about 5 to 9 centimeters in length. The shell's exterior is yellowish-brown to dark brown, often adorned with characteristic pustules or bumps on the surface. Its most defining and beautiful feature is its striking nacre—the inner lining of the shell—which displays a deep purple, lavender, or iridescent violet hue, giving the species its evocative common name.
KingdomAnimaliaPhylumMolluscaClassBivalviaOrderUnionidaFamilyUnionidaeGenusPustulosa
Category
InvertebrateRarity
Common
Danger
1/5 · Very low
Snaps
Be the first to snap!
Interesting facts
The interior of the Purple Pigtoe's shell has a stunning, deep purple iridescent shine, which historically made it highly sought after for the pearl button industry.
These freshwater mussels can live for up to half a century, recording environmental and water quality changes within the growth rings of their shells.
To successfully reproduce, their microscopic larvae must attach to the gills of specific host fish to transform into juvenile mussels without harming the fish.
Special abilities
Ability
Benthic Anchoring
Uses a powerful, muscular foot to burrow deep into the riverbed, anchoring itself securely against swift currents and hiding from predators.
Ability
Biological Filtration
Possesses highly efficient siphon filtration, allowing it to process and clean several liters of river water every day.
Ability
Fish Hitchhiking
Produces specialized larval glochidia that temporarily cling to host fish gills to disperse upstream before settling to the riverbed.
Measurements & details
- Length
- 5-9 cm
- Weight
- 0.05-0.25 kg
- Lifespan
- 20-50 years
- Clutch Size
- 10000-90000
- Incubation
- 30-90 days
Diet & Feeding
Filters organic matter, bacteria, and microscopic algae directly from the water column through its siphons.
Age differences: Larvae absorb nutrients from host fish tissue, while adults filter feed on organic particles.
Primary Foods
- Phytoplankton
- Microscopic bacteria
- Organic detritus
- Unicellular algae
Foraging Method
- Filtering
Ecological connections
parasite
Blackbanded Darter
Percina nigrofasciata
Serves as a host fish for the mussel's larval stage (glochidia), enabling dispersal upstream.
eaten by
Muskrat
Ondatra zibethicus
Preys upon the adult mussels by crushing their shells to eat the soft inner body.
hunts
Green Algae
Chlamydomonas reinhardtii
Primary microscopic food source filtered from the water column.
Traits
No trait badges are assigned for this object yet.
Also known as
No aliases listed yet.
Collections
Collections for this object will appear here as more themes are added.
Safety
Danger
1/5 · Very low
No special safety notes yet.
Frequently Asked Questions
How to identify Purple Pigtoe?
The easiest way to identify Purple Pigtoe is to use the Snappit nature identifier app.
How long is Purple Pigtoe?
5-9 cm
How much does Purple Pigtoe weigh?
0.05-0.25 kg
How long does Purple Pigtoe live?
20-50 years
What does Purple Pigtoe eat?
Filters organic matter, bacteria, and microscopic algae directly from the water column through its siphons.
Where is Purple Pigtoe usually found?
Found in medium to large rivers with moderate currents, typically resting in substrates of sand, gravel, or muddy sand.
How does Purple Pigtoe hunt?
Filtering
How many eggs does Purple Pigtoe lay?
10000-90000
Snap Map
Zoom in to split clusters and explore where this object has been snapped.
Loading map…
Recent Snaps
Recent snaps will appear here as new observations are added.
