Shore life · La Saladita, Guerrero
Needle Sea Urchin
Diadema mexicanum
Spanish: Erizo bandeado
Diadema mexicanum is a species of long-spined sea urchin belonging to the family Diadematidae. It is native to the Pacific coast of Mexico, Costa Rica, El Salvador, Nicaragua and Panama.
TaxonomyEchinoidea › Diadematoida › Diadematidae
Local records15 research-grade observations within about 50 km of La Saladita (the survey box also takes in Zihuatanejo, Ixtapa and Troncones)
Global records987 on iNaturalist
Most recent records2023 – 2026
Months of the 8 most recent records
JanFebMarAprMayJunJulAugSepOctNovDec
Recent local sightings
- 2026-01-23 — iNaturalist observation
- 2025-12-18 — iNaturalist observation
- 2025-11-09 — iNaturalist observation
- 2025-02-20 — iNaturalist observation
- 2025-01-21 — iNaturalist observation
- 2025-01-21 — iNaturalist observation
Interactive card with more photos, sounds and similar species Shore life guide iNaturalist Wikipedia
Cite as: “Needle Sea Urchin (Diadema mexicanum) at La Saladita”, La Saladita Field Guide, lasaladita.com/species/diadema-mexicanum/, updated 2026-11-08. 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.