Nature Field Guide
Smooth-ribbed Mangrove Cockle
- Spanish name
- Piangua o conchudo
- Scientific name
- Anadara similis
What Do Pico & Tati Think?
This mangrove cockle resembles its knobby relative, but details differ.
Species overview
About the Smooth-ribbed Mangrove Cockle
Anadara similis can look much like Anadara tuberculosa. Its shell is generally thinner, its dorsal outline rounder, and its outer covering lacks the bristles described for the other species. Identification should use several features.
Explorer activity: Make a side-by-side sketch of the two piangua species using the source photographs. Write one useful difference and one feature that might be hard to judge.
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 Smooth-ribbed Mangrove Cockle
Oval shell with many radial ribs.
Generally thinner shell and rounder upper outline than A. tuberculosa.
Compare rib structure and outer covering in identified photographs.
Habitat & range
Pacific mangrove-associated habitat.
Local observations
Pacific Costa Rica: Purruja mangrove, Golfo Dulce 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
Make a side-by-side sketch of the two piangua species using the source photographs. Write one useful difference and one feature that might be hard to judge.