Abalone (also known as Ormer or Paua)
Phylum: Mollusca, Class: Gastropoda, Order: Vetigastropoda, Family: Haliotidae, Genus: Haliotis, Species: Haliotis tuberculata · Haliotidae (Abalone family) · Gastropod (univalve) whole shell, flattened ear-shaped morphology
Species
Haliotis tuberculata (Green Ormer)
Shell Type
Gastropod (univalve) whole shell, flattened ear-shaped morphology
Family
Haliotidae (Abalone family)
Size
Approximately 3 to 4 inches in length, which is average for an adult specimen of this species. Typical adults range between 2.5 and 4.5 inches.
Color & Pattern
The exterior surface shown is heavily weathered, bio-eroded, and covered in a layer of greenish algae and micro-borer holes, obscuring the natural reddish-brown to greenish mottled pattern. The inner nacre layer (mother-of-pearl) is hidden from view.
Rarity
Common within its natural rocky reef habitats, though finding intact, pristine specimens washed ashore is less common due to wave action and predators.
Habitat
Found primarily on rocky substrates in shallow subtidal and intertidal zones, often clinging tightly to rocks in areas with moderate to strong wave action where macroalgae (kelp and red algae) are abundant.
Geographic Range
Eastern Atlantic Ocean and Mediterranean Sea, ranging from the English Channel and the coast of the UK down to the Canary Islands, Azores, and the Mediterranean.
Description
This is a heavily worn and bio-eroded abalone shell, viewed from the dorsal exterior. The surface is densely pitted with microscopic and small boring sponge holes, giving it a porous, sponge-like texture overlaid with greenish marine growth. The characteristic ear shape is still clearly visible, though the respiratory pores along the margin are heavily obscured by the weathering.
Key Features
Flattened, ear-like shape (auriform), low-spired apex near the edge, and a row of respiratory holes (tremata) along the side which are typical of the Haliotidae family.
Collector Value
Very low collectible value due to the heavy weathering and erosion. Pristine specimens with clean interior nacre and intact exteriors are valued by collectors, but heavily encrusted beach-worn shells like this one hold little monetary value.
Condition Notes
Poor condition from a collector's perspective. The shell is severely eroded by bio-boring organisms, heavily encrusted with algae, and lacks its original lustrous coloration and nacreous interior visibility. Collectibility grade is Poor/Study grade.
Interesting Facts
Abalones are famous for their iridescent mother-of-pearl (nacre) interiors, which are widely used in jewelry and inlay work. They move using a massive muscular foot, allowing them to clamp down onto rocks with incredible force to resist predators and waves.
Ecological Role
Abalones are important herbivorous grazers in rocky reef ecosystems, feeding primarily on drift kelp and macroalgae. They serve as prey for sea otters, fish, crabs, and starfish, and play a crucial role in maintaining macroalgal balance.
Similar Species
Other Haliotis species such as Haliotis cracherodii (Black Abalone) or Haliotis rufescens (Red Abalone), distinguished primarily by geographic origin, overall size, and the number and elevation of the respiratory pores.
Beach Finding Tips
Look along rocky shores, tide pools, and pebble beaches at extremely low tide, particularly after storms. Scuba diving or snorkeling around rocky reefs in permitted areas is the most reliable way to encounter live or freshly deceased specimens.