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Epicystis crucifer, also called the Rock Flower Anemone, is a tropical sea anemone valued for its colors and flower-like shape. Despite its English common name, it is not a fish but a marine cnidarian that lives attached to the substrate. Its oral disc often shows a contrasting center, short tentacles, and considerable color variation. This species is suitable for mature reef aquariums when provided with stable water, appropriate lighting, and enough room. Its beauty is nevertheless associated with a stinging behavior that must be considered when arranging the aquascape. With proper planning, it can become a striking feature of a marine display.

General species description

Epicystis crucifer is a solitary sea anemone in the order Actiniaria, generally found on rocky bottoms and hard surfaces in the tropical western Atlantic. It attaches itself with its adhesive pedal disc and can contract quickly when disturbed or when lighting decreases. Its appearance varies considerably among individuals and populations, which contributes to its appeal in reef aquaria. Like many anemones, it has stinging cells that help capture small prey and discourage some neighboring organisms. Its availability is moderate in the specialty trade, and supply is often less consistent than for the most commonly traded anemones.

Geographic origin and biotope

This species comes from the tropical western Atlantic, including the Caribbean Sea, the Gulf of Mexico, and coastal areas extending toward northern South America. Countries associated with its range include the United States, Mexico, Belize, Cuba, the Bahamas, several Caribbean countries, and coastal countries of northern South America. It inhabits shallow rocky reefs, crevices, limestone slabs, and areas with regular water movement. It is therefore not associated with freshwater rivers, but with tropical marine habitats providing stable salinity and good oxygenation.

Precise location and local name

Epicystis crucifer is reported from various areas of the Caribbean Sea, the Gulf of Mexico, and the tropical American Atlantic coast. Its distribution is not restricted to one island or one reef, and its local name may differ from one country to another. In Spanish-speaking regions, names expressing the idea of a rock flower anemone may be used. In the aquarium trade, Rock Flower Anemone and Rock Flower Anemones are much more widely used than regional names.

Appearance and physical characteristics

The oral disc is usually rounded, with short, closely arranged tentacles that create a flower-like appearance. Colors may include red, orange, pink, green, brown, blue, or strongly contrasting combinations. Many individuals show a radially marked center, sometimes surrounded by a darker or speckled margin. The pedal disc is usually hidden in a crack or beneath a rock, while the oral disc spreads across the surface. Size depends on the individual; a diameter of approximately 10 to 15 cm is often reached in aquaria, with variation according to husbandry conditions.

General diet

Epicystis crucifer can obtain part of its energy through photosynthesis performed by its symbiotic microalgae, but it also benefits from regular meaty feedings. Small portions of shrimp, mussel, mysis, or other marine foods can be offered with feeding tongs without overfeeding. Portions should match the anemone’s size to prevent leftovers and water-quality problems. Well-oxygenated water and suitable reef lighting support its metabolism. Avoid feeding large pieces directly, as they may remain trapped or contribute to aquarium pollution.

Essential data

• River of origin: none; marine species
• Local name used: regional names equivalent to rock flower anemone
• Origin of the scientific name: genus name Epicystis and specific epithet crucifer
• Meaning of the full name: crucifer means cross-bearing or cross-shaped, referring to radial markings; Epicystis is a genus name formed from Greek roots
• Common/vernacular names: Rock Flower Anemone, Rock Flower Anemones, rock flower anemone
• Family: Discosomidae
• Subfamily: not specified
• Name pronunciation: eh-pi-SIS-tis KROO-si-fer
• Discovery: Charles Alexandre Lesueur, 1817
• Maximum adult size: approximately 15 cm in diameter
• Water temperature and pH: 24 to 28 °C; pH 8.1 to 8.4
• Watercourse appearance and surrounding vegetation: rocky marine reef; algae and benthic organisms
• Typical tankmates: soft corals, stony corals, marine snails, small hermit crabs, cleaner shrimp, peaceful reef fish
• Temperament and behavior: generally stationary, but stinging and capable of moving
• Water depth: shallow to intermediate reef zones
• Sexual dimorphism: not obvious during routine observation
• Bottom structure and flow: rocky or calcareous substrate, with moderate flow and regular circulation

In your aquarium

To maintain Epicystis crucifer successfully, use a mature reef aquarium with stable salinity and a rock structure offering crevices where its pedal disc can attach. Flow should be moderate and indirect, with no powerful jet aimed directly at the oral disc. Leave a buffer zone because its tentacles may irritate nearby corals. Small meaty feedings, high water quality, and consistent reef lighting support long-term acclimation. Its beauty and moderate availability make it an appealing choice for aquarists able to respect its biological requirements and stinging behavior.