## Isactinia citrina is a species of sea anemone found in the marine waters of the western Atlantic Ocean.
Description and Characteristics
Isactinia citrina, also known as the yellow sea anemone, is a small, solitary anemone with a cylindrical body. The column, or body, is typically yellow to orange in color and can reach a maximum size of about 2 cm in diameter. The oral disc, the top surface of the anemone, contains a single opening called the mouth, surrounded by tentacles. These tentacles are typically white or pale yellow and can be numerous, giving the anemone a striking appearance.
Habitat and Occurrence
Isactinia citrina is a common species in the western Atlantic Ocean, primarily inhabiting intertidal and shallow subtidal zones. It is often found attached to rocks, shells, and other hard substrates. The species is particularly prevalent in the neritic zone, the region of the ocean that extends from the shoreline to the edge of the continental shelf. This zone is characterized by its relatively shallow depth and abundant sunlight, providing ideal conditions for Isactinia citrina to thrive.
Taxonomy
Isactinia citrina is a member of the Actiniidae family, which comprises a diverse group of sea anemones. This family belongs to the Order Actiniaria, which includes a wide range of solitary and colonial anemones. Actiniaria is itself classified within the Class Hexacorallia, a group characterized by their possession of six or multiples of six tentacles. This classification reflects the evolutionary relationships among these marine invertebrates.
Feeding
Like most sea anemones, Isactinia citrina is a carnivore. It feeds primarily on small invertebrates, such as crustaceans, worms, and fish larvae. The anemone captures its prey using its stinging tentacles, which are covered in specialized stinging cells called nematocysts. The nematocysts release a toxin that paralyzes the prey, allowing the anemone to draw it into its mouth. The feeding habits of Isactinia citrina highlight its role in the marine ecosystem as a predator and a link in the food chain.
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