The Diadema Urchin, Black Longspine Urchin, Porcupine Sea Urchin – Diadema setosum is a species of sea urchin known for its distinctive long, black spines. This species is a common sight in tropical and subtropical waters around the world, contributing to the vibrant biodiversity of these marine environments.
Description & Characteristics
The Diadema setosum is easily recognizable by its long, slender spines that can reach up to 10 cm in length. These spines are typically black, although they may have a slight purple or brown hue. The test, or shell, of the urchin is usually dark grey or black, and it is covered in short, dense spines. The Diadema setosum can grow to a maximum size of about 10 cm in diameter.
Habitat and Occurrence
The Diadema setosum is found in a variety of habitats, including coral reefs, seagrass beds, and rocky shores. This species is typically found in shallow waters, but it can also be found in deeper waters, up to 40 m. This urchin is commonly found in tropical and subtropical waters around the world, making it a prevalent presence in these aquatic ecosystems.
Taxonomy
The species Diadema setosum belongs to the Class: Echinoidea, Order: Diadematoida, and Family: Diadematidae. The family Diadematidae encompasses a variety of sea urchins characterized by their long, slender spines and distinctive test shape.
Feeding
The Diadema setosum is a herbivore, primarily feeding on algae. Its diet includes a variety of algae, such as red algae, green algae, and brown algae. It plays an important role in maintaining the health of coral reefs by grazing on algae and preventing it from overgrowing.
Image References