Red Abalone (also known as Giant Abalone)
Phylum: Mollusca, Class: Gastropoda, Order: Vetigastropoda, Family: Haliotidae, Genus: Haliotis, Species: Haliotis rufescens · Haliotidae (Abalone family) · Gastropod (univalve), whole shell, flattened oval or ear-shaped shape
Species
Haliotis rufescens
Shell Type
Gastropod (univalve), whole shell, flattened oval or ear-shaped shape
Family
Haliotidae (Abalone family)
Size
Approximately 5-6 inches, which is medium-to-large for this species, though adults can grow up to 10-12 inches.
Color & Pattern
Rich reddish-brown exterior with subtle growth banding and lighter brownish-tan undertones. The surface appears polished or wet, displaying a natural warm luster with a series of distinct open respiratory pores along the margin.
Rarity
Uncommon to Rare depending on the specific location and local conservation regulations protecting wild populations.
Habitat
Found in shallow, cold subtidal waters adhering to rocky substrates, crevices, and kelp forests from the intertidal zone down to depths of about 50 feet.
Geographic Range
Northeastern Pacific Ocean, ranging primarily along the coast of California down into Baja California, Mexico.
Description
A magnificent ear-shaped univalve shell boasting a broad, rounded profile and a striking reddish-brown exterior. Prominent spiral growth lines wrap around the dorsal surface, punctuated by a characteristic row of raised respiratory holes that curve gracefully along the shell's side.
Key Features
Broad ear-shaped (auriform) morphology, a series of open respiratory holes (usually 3 to 4 open on this specimen), a large respiratory capacity, and a brick-red to brownish exterior coloration.
Collector Value
Moderately high collector value, heavily dependent on size, pristine nature of the shell, and whether it was legally and ethically sourced due to strict regional protection laws.
Condition Notes
Good condition. The exterior shows natural wear with several characteristic open respiratory pores, some minor pitting, and well-preserved structural integrity. Collectibility grade: Good to Fine.
Interesting Facts
Abalones are famous for their brilliant, iridescent mother-of-pearl (nacre) interior. They feed primarily on giant kelp using a rasping tongue called a radula, and their powerful muscular foot allows them to cling tightly to rocks against fierce wave action.
Ecological Role
Abalones are crucial herbivores in kelp forest ecosystems, helping maintain the balance of kelp populations. They serve as prey for sea otters, octopuses, and large fish, and are heavily managed and protected due to overfishing.
Similar Species
Black Abalone (Haliotis cracherodii) which is darker and typically has more pores, and Green Abalone (Haliotis fulgens) which features a more greenish-brown exterior and iridescent sheen.
Beach Finding Tips
Finding a whole abalone shell on the beach is quite rare since they generally inhabit rocky subtidal zones. Look in rocky tidal pools after major winter storms or check local reputable shell dealers.