Nature Field Guide
Apple Rocksnail
- Spanish name
- Caracol de roca
- Scientific name
- Vasula melones
What Do Pico & Tati Think?
An apple rocksnail lives among the rocks of the lower shore.
Species overview
About the Apple Rocksnail
This muricid is associated with low intertidal rocks. Older references may call it Thais melones. The two names can refer to the same species, an example of why scientific names sometimes change.
Explorer activity: Find both scientific names in the source labels. Add them to your notebook and explain why two different names do not always mean two different animals.
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 Apple Rocksnail
Coiled rocksnail shell.
Compare its broad outline, spire and opening with an identified reference.
Older labels may use the name Thais melones.
Habitat & range
Lower rocky intertidal zone.
Local observations
Pacific Costa Rica: Bahía Panamá and Guanacaste records. 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
Find both scientific names in the source labels. Add them to your notebook and explain why two different names do not always mean two different animals.