Fragmented Murex or Rock Shell (possibly False Wing Murex)
Phylum: Mollusca; Class: Gastropoda; Order: Neogastropoda; Family: Muricidae; Genus: Pterochelus; Species: acanthopterus · Muricidae (Murex or Rock Snail family) · Gastropod (univalve); Fragmented specimen showing remnant of the labial varix (wing) and siphonal canal.
Species
Pterochelus acanthopterus (likely based on regional probability and remnant wing shape)
Shell Type
Gastropod (univalve); Fragmented specimen showing remnant of the labial varix (wing) and siphonal canal.
Family
Muricidae (Murex or Rock Snail family)
Size
Approximately 1.5 - 2 cm in current fragmented state. Original shell was likely 6-9 cm.
Color & Pattern
Solid chalky white with a porcelain-like luster. The color appears bleached by sun and tide action, which is typical for beach-cast fragments in the Brisbane region.
Rarity
Common as a fragment; Uncommon to find as a perfect, intact specimen on the beach at Sandgate due to high wave energy and tidal churning.
Habitat
Found in subtidal waters, typically on rocky reefs or muddy sand substrates at depths of 10-50 meters.
Geographic Range
Endemic to Australia; specifically common along the coastlines of Queensland (including Moreton Bay/Sandgate area) and Western Australia.
Description
This is a weathered fragment of a predatory sea snail. It displays a prominent, flattened projection which is part of the 'frilly' wing structure typical of the Pterochelus genus. The texture is dense and calcified, showing the internal whorl structure where the shell has broken away.
Key Features
Triangular wing-like varix, curved siphonal canal base, and thickened porcelainous texture characteristic of the Muricidae family.
Collector Value
Minimal financial value due to being a fragment; however, it serves as an excellent 'indicator shell' for the biodiversity of the Sandgate mudflats and reefs.
Condition Notes
Poor (fragment). This is a beach-worn shard, not a complete shell. It has significant erosion and breakage, likely tumbled in the surf of Moreton Bay for a long period.
Interesting Facts
The living animal is a predator that uses a specialized tongue (radula) to drill holes into other mollusks or barnacles to eat them. The 'wings' on the shell are thought to help stabilize the snail on soft sandy bottoms.
Ecological Role
Secondary consumer; helps control populations of bivalves and other grazing gastropods. In its current fragmented state, it eventually breaks down into calcium carbonate sand.
Similar Species
Pterynotus triformis (Three-winged Murex), which has more elongated wings, and various species of Chicoreus which have more branched spines.
Beach Finding Tips
Look along the high-tide line at Sandgate or Brighton after a storm or strong easterly winds. These heavy fragments often settle near shell banks or rocky outcrops.
Notes
Brighton Sandgate brisbane