Nature Field Guide
Rough Venus Clam
- Spanish name
- Almeja blanca
- Scientific name
- Leukoma asperrima
What Do Pico & Tati Think?
Fine crossing sculpture gives this small clam a textured surface.
Species overview
About the Rough Venus Clam
This venus clam appears in Gulf of Nicoya tidal-flat records. Radial ribs and finer crossing lines create a rough-looking surface. Older sources may use Protothaca asperrima for the same species.
Explorer activity: Draw an enlarged patch of the shell surface using a source photograph. Describe the pattern with words: crossing, curved, straight or raised. Do not use touch to test a living shell.
Your discovery notes: Record the date, place and habitat, then add a sketch or photograph. If you cannot confirm the species, label it “unidentified shell” and keep your observations.
Identification
Key Features of the Rough Venus Clam
Rounded to oval valves.
Radial ribs crossed by finer lines.
Compare intact shell sculpture and hinge with an identified reference.
Habitat & range
Documented on estuarine sand-mud flats at Punta Morales in the Gulf of Nicoya. The study supports the Puntarenas & the Gulf Islands browsing region; it does not establish a complete national range.
Local observations
Pacific Costa Rica: Punta Morales, Gulf of Nicoya field study. This supports regional inclusion, not a confirmed Tamarindo Beach sighting.
When to observe
Tides and conditions affect visibility. Let an adult or local guide choose a safe observation time; this card does not promise a seasonal sighting.
Conservation & care
Observe and photograph shells where they are. Leave living animals, occupied shells and empty shells in place. Do not pry animals from rocks, dig in mangroves or put fingers into shell openings. Explore with an adult or guide, follow site rules and stay clear of surf and slippery rocks.
Observation activity
Draw an enlarged patch of the shell surface using a source photograph. Describe the pattern with words: crossing, curved, straight or raised. Do not use touch to test a living shell.