Checkered Nerite, Bleached Nerite (Set of 3 Cabo beach shells)
Phylum: Mollusca, Class: Gastropoda, Order: Cycloneritida, Family: Neritidae, Genus: Nerita, Species: Nerita tessellata (referring to the primary gastropod) · Neritidae (Nerite family), Arcidae (Ark family - middle shell), Balanidae (Barnacle - top shell) · Gastropod (Nerite), Bivalve (Ark clam valve), and Sessile Crustacean (Barnacle fragment). All are beach-worn specimens.
Species
Nerita tessellata (Likely identification for the small gastropod; confidence 85%)
Shell Type
Gastropod (Nerite), Bivalve (Ark clam valve), and Sessile Crustacean (Barnacle fragment). All are beach-worn specimens.
Family
Neritidae (Nerite family), Arcidae (Ark family - middle shell), Balanidae (Barnacle - top shell)
Size
Miniature; approx 0.5 to 0.75 inches (12-20mm). This is typical for juvenile or beach-washed specimens of these species.
Color & Pattern
The Nerite is heavily sun-bleached to a flat white; it likely originally featured black and white checkered patterns. The Ark shell is off-white to cream. The barnacle is tan-pink. All show heavy calcification and loss of original pigment due to wave action and UV exposure.
Rarity
Very Common. These are the most frequent 'beach-finds' in the Cabo region, often appearing in drift lines.
Habitat
Intertidal zone, typically found on rocky shores, coral rubble, and tide pools in subtropical to tropical marine environments.
Geographic Range
Commonly found throughout the Panamic province, including the Gulf of California (Cabo San Lucas/Baja) and reaching down to Peru.
Description
A collection of three common beach-washed items: A small, globose Gastropod (Nerite) with a thick shell and low spire; a single valve of a Bivalve (likely a juvenile Ark clam) with fine radial ribs; and a heavily eroded Acorn Barnacle base showing the internal cavity.
Key Features
Nerite: Hemispherical shape and thick outer lip. Ark: Hinge line with numerous small teeth (though worn) and prominent ribs. Barnacle: Volcano-like structure and rough, plate-like texture.
Collector Value
Minimal monetary value (less than $1). They hold high sentimental value as beach souvenirs but are too worn for high-end professional collections. They are perfect for resin crafts or shadow boxes.
Condition Notes
Fair to Poor. These are 'beach-worn' specimens. They exhibit significant erosion of the sculptural details, sun-bleaching (loss of color), and mechanical damage from being tossed in the surf. Collectibility grade: Fair.
Interesting Facts
Neritas are known for their incredibly strong shells and opercula, which allow them to withstand high-energy surf and deter predators like crabs. They are 'social' mollusks, often huddling together in rock crevices to retain moisture during low tide.
Ecological Role
Nerites are important grazers that control algae growth on coastal rocks. The empty shells later provide homes for very small hermit crabs.
Similar Species
Nerita fulgurans (distinguished by stronger ridges) and various small Arcidae species which are difficult to differentiate when worn to this degree.
Beach Finding Tips
Look in 'shell hash' lines during low tide, particularly near rocky outcroppings or jetty walls where the tide deposits smaller heavy shells.
Notes
Cabo