commonly known as the Rock-Boring Urchin or the West Indian Sea Egg, is a species of sea urchin found in the western Atlantic Ocean, particularly in the Caribbean region. Here is some information about Eucidaris metularia:

Fish Family: Eucidaris metularia belongs to the family Cidaridae, which includes species of sea urchins known for their robust bodies, long spines, and ability to bore into rock substrates.

Size: Eucidaris metularia can reach a size of about 10 to 15 centimeters (4 to 6 inches) in diameter. It has a spherical body covered in long, stout spines that can grow up to 5 centimeters (2 inches) in length.

Basic/Overall Shape/Features: Eucidaris metularia has a compact, globular body shape with prominent tubercles or bumps on its surface. It has long, sharp spines that radiate from its body, providing protection and aiding in locomotion. The spines are typically black or dark brown in color and may have lighter bands or tips.

Body Coloration/Pattern: Eucidaris metularia has a predominantly dark-colored body, with variations of black, brown, or reddish-brown. The spines are usually darker than the body, creating a contrast. The coloration and pattern may help the sea urchin blend with its rocky habitat.

Social Behavior: Eucidaris metularia is primarily a solitary species. It is a herbivorous sea urchin, feeding on algae and other marine vegetation. It can be found in rocky reef habitats and seagrass beds, where it uses its powerful jaws to scrape algae from surfaces.

Fashion: Eucidaris metularia does not exhibit fashion-related behaviors or adaptations. Its appearance is mainly characterized by the arrangement and coloration of its spines, which provide protection and aid in locomotion.

Eucidaris metularia plays an important ecological role as a grazier, controlling the growth of algae and contributing to the health and balance of reef ecosystems. It is also a valuable species for scientific research due to its ability to bore into rock substrates. However, like other marine organisms, Eucidaris metularia faces threats such as habitat degradation, pollution, and overfishing. Conservation measures, including the establishment of marine protected areas and sustainable fishing practices, are necessary to ensure the long-term survival of Eucidaris metularia and the preservation of its habitat.