Hercules Club Whelk (also known as the Hercules Creeper or Club Mudwhelk)
Phylum: Mollusca, Class: Gastropoda, Order: Sorbeoconcha, Family: Batillariidae, Genus: Pyrazus, Species: P. ebeninus · Batillariidae (Mudwhelk or Creeper family) · Gastropod (univalve snail); whole shell with a spiral, turreted, and heavily nodulose shape.
Species
Pyrazus ebeninus
Shell Type
Gastropod (univalve snail); whole shell with a spiral, turreted, and heavily nodulose shape.
Family
Batillariidae (Mudwhelk or Creeper family)
Size
Based on the image, approximately 60-80mm in length. This is a mid-sized adult; the species typically reaches up to 100mm.
Color & Pattern
Naturally a dark brownish-black to charcoal grey. This specimen shows significant environmental encrustation including greenish algae and greyish mineral deposits. The underlying dark banding is visible toward the apex. It appears weathered rather than sun-bleached.
Rarity
Very Common. This is one of the most ubiquitous shells found in the intertidal zones of Brisbane's bayside suburbs like Sandgate and Brighton.
Habitat
Intertidal mudflats, mangrove swamps, and sandy-mud estuaries. They are often found in large colonies partially submerged in silt at low tide.
Geographic Range
Common along the eastern coast of Australia, specifically from Queensland (including Brisbane's Moreton Bay) down to New South Wales.
Description
A heavy, robust shell characterized by a thick set of spiral cords and prominent, blunt nodules on the shoulder of each whorl. The shell is roughly conical and tapering toward the apex. The surface is coarse, designed to withstand the abrasive nature of muddy environments.
Key Features
Large size for a mudwhelk, heavy calcification, and distinctive blunt knobs (nodules) encircling the upper part of the whorls. The aperture (though not fully visible) typically features a flared outer lip and a dark columella.
Collector Value
Low monetary value ($1-$5 USD) due to its abundance. Its value is primarily educational or for those building a representative regional collection of East Australian marine life.
Condition Notes
Fair. The shell is intact but heavily weathered with significant 'ocean wear.' The apex is slightly eroded and the exterior is obscured by biological growth and staining. Not a 'gem' specimen, but a typical representative beach find.
Interesting Facts
These snails are essential 'ecosystem engineers' of the mudflats. They are long-lived and their empty shells provide critical homes for large hermit crabs in Australian estuaries. Historically, they were a significant food source for Indigenous Australians.
Ecological Role
Dethritivore/Grazer. They feed on algae and organic matter in the mud, helping to recycle nutrients. They are a primary prey item for large mud crabs and stingrays.
Similar Species
Telescopium telescopium (Telescope Snail), which is more strictly conical and lacks the large blunt nodules, and Batillaria australis, which is much smaller.
Beach Finding Tips
Visit Brighton or Sandgate at low tide. Look for them in the soft mud near mangrove roots or along the muddy-sand transition line. They are often so numerous you have to be careful not to step on them.
Notes
Brighton beach Sandgate Brisbane