Long-spined Sea Urchin

Diadema antillarum

Sighting evidence at The Maze, Sint Maarten / Saint-Martin

Long-spined black sea urchins have recovered at The Maze following the catastrophic Caribbean-wide die-off of the 1980s, with dense populations now grazing the reef algae and maintaining clear substrate for coral settlement. Their recovery is a sign of improved reef ecosystem function at this site.

Evidence at this site

No confirmed records on file at this site

Long-spined Sea Urchin is listed as a curated species here based on historical reports.

How is this calculated?

Sighting evidence is compiled from iNaturalist observation records within a set proximity radius, filtered for quality-grade observations. “Last confirmed” is the date of the most recent research-grade record. Record count covers a rolling 24-month window. Confidence reflects record count, recency, and consistency of seasonal signal.