Species Name: Acetabularia crennulata

Authority: J.V. Lamouroux

Common Name: Mermaid’s Cup/Mermaid Wine Glass Alga

Natural Environment: Inhabits shallow backreef areas

Aquarium Suitability: About 2 inches (5 cm) high with a 0.5 inch (1 cm) cup. Each stem and cup is a single cell. Generally found in very shallow sheltered areas, usually attached to rocks and gravel/small stones. Difficult to maintain in aquaria, with a slightly higher than normal alkalinity and calcium level recommended if any level of success with this alga is to be had.

Potential Control Species: Fish: Zebrasoma desjardinii, Zebrasoma flavescens, Zebrasoma scopas, Zebrasoma veliferum, Zebrasoma xanthurum, Siganus corallinus, Siganus guttatus, Siganus magnifica, Siganus vulpinus

Sea Hares: Aplysia californica

Snails: Trochus niloticus, Strombus alatus, Strombus gigas

Urchins: Diadema setosum, Mespilia globulus