Nature Field Guide
Knobby Mangrove Cockle
- Spanish name
- Piangua
- Scientific name
- Anadara tuberculosa
What Do Pico & Tati Think?
A ribbed mangrove shell has small bumps that help explain its name.
Species overview
About the Knobby Mangrove Cockle
This cockle is associated with Pacific mangroves. Its thick oval valves have prominent ribs and nodules. A dark outer covering can hide the shell color beneath, while worn valves may lose helpful details.
Explorer activity: Compare reference photographs of this species and Anadara similis. Draw a close view of one rib and mark whether you can see bumps or a covering.
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 Knobby Mangrove Cockle
Thick, oval valves with raised ribs.
Small nodules occur along the ribs.
A dark, sometimes bristly outer covering may remain on fresh shells.
Habitat & range
Mangrove-associated muddy 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
Compare reference photographs of this species and Anadara similis. Draw a close view of one rib and mark whether you can see bumps or a covering.