Common Names: Hammer coral, Anchor coral, Wall Hammer coral
Scientific Name: Euphyllia ancora
Veron Corals of the World:
Characters: Colonies may form a continuous cover over the substrate many meters across although individual colonies are seldom over one meter across. Colonies have the same skeletal structure as Euphyllia divisa. Polyps have large tubular tentacles with few or no branchlets but with anchor, hammer or T-shaped tips Color: Blue-grey to orange, usually with pale cream or green outer borders to the tentacles. Similar species: Euphyllia paraancora. Habitat: Large colonies are usually found in shallow environments exposed to moderate wave action. Abundance: Seldom common, but may be a dominate species in protected horizontal substrates and on rock outcrops in high latitude locations.
E ancora can grow to be a large coral. Its skeleton grows in a continuous meandering fashion and is frequently referred to as the ‘wall’ hammer coral to differentiate it from the ‘branching’ hammer corals which have multiple heads that are separated by dead portions of the skeleton. The coral is most easily distinguished from the similar Torch or Frogspawn corals by the shape of the tips of its polyps which have a characteristic anchor, hammer or T-shape to them which gives it it’s common names.
The tentacles are most often a subtle but attractive green-brown to a cream color, but more striking colors such as bluish, neon green, orange, yellow and sometimes mottled with several different colors have recently been introduced into the hobby though they tend to be fairly rare and command a higher price.
Found over much of the Indo-Pacific region. They typically live in shallow reef environments where wave action is moderate.
E. ancora is a hearty coral once established in an aquarium. New specimens can sometimes be damaged during collection or transportation and those damaged areas are prone to an infection called brown-jelly infection. As the name implies, the area of infection turns into a brown jelly looking goo. Brown-jelly infection can spread swiftly, killing the coral. You should pass up any coral that shows signs of brown-jelly infection when shopping. If there is a damaged area which doesn’t look infected, the coral may recover fine, just keep a watchful eye on it.
Requires moderate to strong lighting.
Prefers moderate non-laminar water motion that gently waves their tentacles. They should not be exposed to strong water currents.
Very High. E. ancora can expand considerably from its skeleton and has sweeper tentacles that may extend another couple of inches further than the normal tentacles. The tentacles pack a powerful sting that will win in almost any altercation with another coral. In addition, E. ancora can grow fairly rapidly and to a large size, so it will tend to encroach upon any close neighbors over time. They can however usually be in direct contact with other members of the Euphyllia family such as Frog Spawn or Torch corals without incident.
E. ancora are photosynthetic which will take care of most or all of their nutritional needs. They will also take small meaty foods such as Mysis shrimp if offered during the day when the tentacles are extended and may benefit from an occasional feeding especially if lighting is marginal, but it is usually not required. It may be helpful to temporarily reduce the water motion during feeding so that the food can be more easily transported to the mouth.
Supplements & Water Chemistry:
Salinity should be maintained between sg 1.024 and 1.026.
Alkalinity should be maintained in the 8-12 dKH range
Calcium should be maintained in the 400-460ppm range
pH should be maintained between 8.0-8.4
Does well within a range of at least 74º to 82º F
Best positioning is on the rock work in a moderate water flow area of the tank where it can get strong lighting and has room around it to expand and grow.
Most E ancora Wall Hammer corals are imported from the wild as they are more difficult to propagate than Branching Hammer corals due to their skeletal structure.
Header picture courtesy of Nick Hobgood. All other photos by ReefCorner © All Rights Reserved