Nature Field Guide
Polished Tagelus Clam
- Spanish name
- Almeja Tagelus
- Scientific name
- Tagelus politus
What Do Pico & Tati Think?
This tidal-flat clam demonstrates how a scientific name can be updated.
Species overview
About the Polished Tagelus Clam
The Gulf of Nicoya study recorded this clam as Tagelus bourgeoisae. WoRMS now treats that name as a synonym of Tagelus politus. Keeping both names in your notes helps connect older research with the current guide.
Explorer activity: Make a notebook label with the current name on top and the older name below. Measure the proportions of a reference photograph rather than digging for an animal.
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 Polished Tagelus Clam
A bivalve rather than a coiled snail shell.
Record length, height and hinge position in a reference photograph.
Compare with Tagelus politus, including references labeled T. bourgeoisae.
Habitat & range
Estuarine sand-mud flats.
Local observations
Pacific Costa Rica: Punta Morales record under Tagelus bourgeoisae. 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 notebook label with the current name on top and the older name below. Measure the proportions of a reference photograph rather than digging for an animal.