Nature Field Guide
Dunker’s Dosinia
- Spanish name
- Almeja Dosinia
- Scientific name
- Dosinia dunkeri
What Do Pico & Tati Think?
A rounded clam shell rewards a closer look at fine surface lines.
Species overview
About the Dunker’s Dosinia
Dosinia dunkeri is a venus clam recorded from the Gulf of Nicoya. Its pale, rounded shell has fine concentric sculpture. A round white shell alone is not enough to identify the species.
Explorer activity: Draw a curved surface line from a reference photograph. Compare it with a cockle’s outward-running ribs. Are the lines arranged in the same direction?
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 Dunker’s Dosinia
Rounded, pale valves.
Fine concentric lines curve around the raised area near the hinge.
Confirm with hinge details and an identified reference.
Habitat & range
Coastal sand-mud habitat.
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 a curved surface line from a reference photograph. Compare it with a cockle’s outward-running ribs. Are the lines arranged in the same direction?