Common name: Green Cactus Algae

General information

Neomeris annulata, commonly known as Green Cactus Algae or Segmented Halimeda, is a species of calcareous green algae found in tropical marine environments. It is characterized by its segmented, cylindrical branches that resemble a cactus, and its bright green coloration. This alga is part of the Halimedaceae family and is known for its ability to contribute to the formation of reef structures by depositing calcium carbonate within its tissues.

Care

Green Cactus Algae requires a stable marine aquarium with strong lighting and moderate to high water flow. It is important to maintain calcium levels as this alga uses calcium to build its calcareous structure. It can be a beneficial addition to a reef tank as it helps maintain water quality by absorbing nutrients like nitrates and phosphates.

Symbiosis

While Neomeris annulata does not have any well-known symbiotic relationships like those seen in corals and anemones, it does provide a microhabitat for small invertebrates and can contribute to the overall biodiversity of the reef aquarium.

Habitat

Neomeris annulata is typically found in shallow reef environments, often growing on rock or dead coral substrates. It is distributed across the Indo-Pacific region, including the Red Sea, the Indian Ocean, and the central and western Pacific Ocean.