Cup Coral

Tubastraea coccinea

Sighting evidence at The Crevice, Guam, Mariana Islands (Guam & Saipan)

Photo: Marisa Agarwal · CC BY-NC

Orange cup corals carpet every square centimetre of the Crevice's shaded walls, their polyps extending at night into brilliant orange stars that transform the interior from a quiet gold encrustation by day into a luminescent orange gallery after dark. Unlike photosynthetic corals, cup corals are entirely carnivorous and their density here reflects the particle-laden current that pulses through the slot on tidal cycles.

Evidence at this site

1 record within 25 km

Confidence: low

Last confirmed May 2025

Seasonality

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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.

Cup Coral

Evidence at this site

Seasonality

Also seen at other sites