Shore life · La Saladita, Guerrero
slate pencil urchin
Eucidaris thouarsii
Spanish: Erizo punta de lapiz
The slate pencil urchin, Eucidaris thouarsii, is a species of cidaroid sea urchins that inhabits littoral regions of the East Pacific Ocean.
TaxonomyEchinoidea › Cidaroida › Cidaridae
Local records20 research-grade observations within about 50 km of La Saladita (the survey box also takes in Zihuatanejo, Ixtapa and Troncones)
Global records759 on iNaturalist
Most recent records2025 – 2026
Months of the 8 most recent records
JanFebMarAprMayJunJulAugSepOctNovDec
Recent local sightings
- 2026-03-21 — observation by santiago_miguel_alva
- 2026-01-21 — observation by zihuadean
- 2025-11-12 — observation by zihuadean
- 2025-08-06 — observation by dani1212
- 2025-07-31 — observation by sirenadelmanglar
- 2025-04-03 — observation by biologizing
Interactive card with more photos, sounds and similar species Shore life guide iNaturalist Wikipedia
Cite as: “slate pencil urchin (Eucidaris thouarsii) at La Saladita”, La Saladita Field Guide, lasaladita.com/species/eucidaris-thouarsii/, updated 2026-09-26. Observation counts and months come from iNaturalist research-grade records within about 50 km of 17.8375°N, 101.7606°W (the survey box also takes in Zihuatanejo, Ixtapa and Troncones); summary text from Wikipedia where present.