Red Abalone (also known as Red Ormer)
Phylum: Mollusca, Class: Gastropoda, Order: Vetigastropoda, Family: Haliotidae, Genus: Haliotis, Species: H. rufescens · Haliotidae (Abalone family) · Gastropod univalve with an ear-shaped form and a row of respiratory holes, whole shell viewed from the interior side.
Species
Haliotis rufescens
Shell Type
Gastropod univalve with an ear-shaped form and a row of respiratory holes, whole shell viewed from the interior side.
Family
Haliotidae (Abalone family)
Size
Estimated at approximately 4-5 inches in length based on typical proportions, though the species can grow much larger up to 10-12 inches. This specimen represents a medium-sized or juvenile to sub-adult individual.
Color & Pattern
The interior surface displayed here is characterized by a brilliant, highly reflective nacre (mother-of-pearl) with iridescent plays of pink, silver, green, and copper tones, highlighted by natural brownish and muted dark patches. The exterior surface (not fully shown) typically features a brick-red or dull reddish-brown coloration.
Rarity
Common in specialized rocky marine habitats within its native range, but intact natural specimens in good condition require dedicated searching or diving due to conservation limits and coastal regulations.
Habitat
Found in marine environments clinging tightly to rocky substrates in the lower intertidal and shallow subtidal zones, typically down to depths of about 60 feet, often among kelp forests where drift algae is abundant.
Geographic Range
Northeastern Pacific Ocean, ranging primarily from British Columbia, Canada, down along the coast of California to Baja California, Mexico.
Description
An exquisite specimen of the Red Abalone, showing the smooth, deeply lustrous nacreous interior. The shell is auriform (ear-shaped) with a wide, open aperture and a characteristic curved row of open respiratory pores (trephines) running along the raised left margin, allowing water to pass out from the gills.
Key Features
Distinguished by its large, ear-shaped univalve structure, a series of open respiratory holes (typically 3 to 5 open holes visible in this view), a broad flattened body whorl, and a deeply iridescent mother-of-pearl interior lining.
Collector Value
Highly desirable for decorators, crafters, and shell collectors alike due to its stunning iridescent interior. Values vary widely based on size, origin, and whether the exterior has been polished, generally ranging from $10 to $50 for common commercial-grade specimens.
Condition Notes
Good to Fine condition. The interior nacre is well-preserved, smooth, and highly polished with minimal wear. The margins appear intact, and the respiratory pores are cleanly defined. Collector grade: Fine.
Interesting Facts
Abalones are famous for producing high-quality pearls and incredibly strong nacre, which is studied by engineers for its impact-resistant micro-architecture. The living snail uses a powerful muscular foot to grip rocks with incredible suction, and feeds by grazing on macroalgae and kelp.
Ecological Role
Abalones serve as vital herbivores in kelp forest ecosystems, controlling algae growth. They are prey for sea otters, octopuses, and large fish. Due to overfishing and disease, many abalone populations are heavily regulated or endangered, making conservation efforts crucial.
Similar Species
Can be confused with other abalone species such as the Green Abalone (Haliotis fulgens) or Black Abalone (Haliotis cracherodii). They are distinguished by the number and elevation of respiratory pores, exterior color, and the inner shape of the shell.
Beach Finding Tips
Finding a whole abalone shell on a beach is quite rare because they generally inhabit deep rocky subtidal zones. Most beach finds are fragments, though stormy weather or tidal shifts can occasionally wash up specimens near kelp-heavy rocky shores.