
Source: Wikimedia Commons
Amplexidiscus fenestrafer
The only species in its genus, a corallimorph reaching 40 cm across. It spreads a flexible disc set with cone-shaped tentacles and, when prey touches it, raises the lobed margin toward the centre to close into a ball. Colour is light beige to brown.
Amplexidiscus fenestrafer is the only species in its genus, a corallimorph of the tropical Indo-West Pacific. Related to the stony corals, it builds no calcareous skeleton. The visible part of the body is the oral region, which spreads into a flexible disc set with cone-shaped tentacles and can reach 40 cm across; colour is light beige to brown. It often forms small colonies on the upper reef between 5 and 25 m. Its diet is broad, ranging from the products of its zooxanthellae to benthic invertebrates, crustaceans, worms, echinoderms and even fish trapped by the oral disc. Once prey is caught and digestion begins, the lobed edges of the disc are raised toward the centre to form a ball. Because of this feeding behaviour it should be kept with care alongside small fish and shrimps. Having no skeleton, it is not covered by the CITES coral listings.
Source: Wikipedia (CC BY-SA 4.0)
The Giant Elephant Ear (Amplexidiscus) grows to Up to about 40 cm in diameter.
The ideal temperature for the Giant Elephant Ear (Amplexidiscus) is 24〜26℃.
Origin
Tropical Indo-West Pacific, often forming small colonies on the upper reef at depths of 5-25 m.
Size
Up to about 40 cm in diameter
Temperature
24〜26℃
Sources: LiveAquaria (Green Rhodactis Mushroom Coral) / LiveAquaria (Hairy Mushroom Coral) / WoRMS (World Register of Marine Species)
Edited & verified by: BreederDirect editorial team
The taxonomic, regulatory, and husbandry data on this page are compiled and verified against the authoritative primary sources below.
Accepted name: Amplexidiscus fenestrafer Dunn & Hamner, 1980
Authority databases: WoRMS
Nomenclature follows global taxonomic authority databases.
Sources: CITES Appendices (taxon not listed)
Regulations may change. Always verify the latest information with the relevant authorities.
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Nutrition from its zooxanthellae plus benthic invertebrates, crustaceans, worms, echinoderms and even fish that it traps.
LiveAquaria lists Rhodactis mushrooms as low to moderate light corals, and this species is kept the same way. It shrinks under strong light.
Place it on the bottom or low rockwork in low to moderate flow. It expands to 40 cm across, so keep other corals well away.
Water 24-26C, specific gravity 1.023-1.025 (salinity 33-35 ppt), pH 8.1-8.4, KH 8-12. Iodine and trace elements are recommended.
Its large disc makes it an efficient predator. Offer brine shrimp or chopped seafood near the mouth with tweezers; the disc closes into a ball after feeding.
It eats small fish and shrimps that touch the disc, and sleeping fish have been caught this way, so avoid siting it where fish rest at night. Having no skeleton, it is not covered by the CITES coral listings.
Beginner. This is a beginner-friendly species. No special equipment or experience is required, and it can be kept successfully with basic care setup.
The ideal temperature for Giant Elephant Ear (Amplexidiscus) is 24〜26℃. Avoid sudden temperature changes and maintain a stable environment.
Giant Elephant Ear (Amplexidiscus) typically reaches Up to about 40 cm in diameter as an adult. Size may vary depending on care conditions and individual genetics.
Giant Elephant Ear (Amplexidiscus) feeds on: Nutrition from its zooxanthellae plus benthic invertebrates, crustaceans, worms, echinoderms and even fish that it traps.. Aim for a balanced diet with appropriate feeding frequency.
The price of Giant Elephant Ear (Amplexidiscus) varies significantly depending on variety, size, and individual quality. Check our market price page for the latest pricing information.
Last updated: September 28, 2026