VU

Lobophyllia coral

Lobophyllia flabelliformis

Unknown

Overview

This large, fleshy stony coral forms colonies of thick, meandering ridges and valleys, with polyps that expand fleshy tissue lobes during the day, giving colonies a distinctive folded, brain-like or flower-like appearance in shades of green, brown, red, or cream. As a member of the family Lobophylliidae within the order Scleractinia, it builds calcium carbonate skeletons that contribute to reef framework, while its tissues host symbiotic zooxanthellae algae that supply the coral with energy through photosynthesis. It also feeds directly using extensible tentacles at night to capture zooplankton.

Like other reef-building corals, it provides structural habitat that supports fish and invertebrate communities.

The species is distributed across the Indo-Pacific, with confirmed populations in Australia, the Philippines, Thailand, Indonesia, Papua New Guinea, Japan, Malaysia, Palau, Saudi Arabia, Taiwan, and Vietnam. It inhabits shallow marine reef environments, typically on reef slopes and in lagoons where light penetration supports its symbiotic algae.

The species is classified as Vulnerable, with an unknown population trend. Its principal threats include ocean warming, which triggers coral bleaching by disrupting the coral-algae symbiosis, and ocean acidification, which impairs skeletal formation. Coastal development and associated sedimentation degrade water quality and smother colonies, while agricultural runoff introduces excess nutrients and pollutants.

Collection for the marine aquarium trade, driven by the species' ornamental appeal, adds further pressure to wild populations.

Conservation efforts include regulation of collection through international trade mechanisms, marine protected areas across parts of its range, and reef monitoring programs tracking bleaching events. Given the continuing intensification of climate-related stressors alongside localized pressures, the species' long-term outlook remains uncertain, contingent on global progress in mitigating ocean warming and acidification.

Lobophyllia flabelliformis coral faces serious danger from rising ocean temperatures that cause bleaching, as well as increasingly acidic seawater that weakens its skeleton. It's also harmed by coastal construction that muddies the water, runoff of farm chemicals and fertilizers, and collection by people supplying the aquarium fish trade. These combined pressures are ongoing and show no signs of letting up.

Threat summary

Habitat

This species inhabits shallow coral reef environments in the Indo-Pacific, typically found on reef slopes and lagoons at depths of 5-30 meters. It prefers areas with moderate water flow and clear water conditions, often forming large colonies on hard substrates in tropical marine ecosystems.

MARINE· major

Frequently asked questions

Why is Lobophyllia coral classified as Vulnerable?
Lobophyllia coral is classified as Vulnerable because the population is declining and the species faces a high risk of extinction in the medium-term future if current pressures continue. Lobophyllia flabelliformis coral faces serious danger from rising ocean temperatures that cause bleaching, as well as increasingly acidic seawater that weakens its skeleton. It's also harmed by coastal construction that muddies the water, runoff of farm chemicals and fertilizers, and collection by people supplying the aquarium fish trade. These combined pressures are ongoing and show no signs of letting up.
Where does Lobophyllia coral live?
Lobophyllia coral occurs in Australia, Indonesia, Japan, Malaysia, Palau, and Papua New Guinea (plus 5 other countries). Country-level distribution data is sourced from the IUCN Red List and cross-referenced with GBIF occurrences.
What are the main threats to Lobophyllia coral?
The main threats to Lobophyllia coral are ai-1, ai-2, ai-3, and ai-4. The full IUCN-classified threat record for this species is detailed on the species page.

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