commonly known as the Collector Urchin or Black Sea Urchin, is a species of sea urchin found in tropical and subtropical regions of the Indo-Pacific. Here is some information about Tripneustes gratilla:

Fish Family: Tripneustes gratilla belongs to the family Toxopneustidae, which includes species of sea urchins with toxic spines.

Size: Tripneustes gratilla can reach a size of about 10 to 15 centimeters (3.9 to 5.9 inches) in diameter. It has a round body covered with long, hollow spines that can grow up to 10 centimeters (3.9 inches) in length.

Basic/Overall Shape/Features: Tripneustes gratilla has a spherical body covered with long, black spines. The body is typically dark-colored, ranging from black to brown, providing camouflage in rocky or coral reef habitats. The spines are sharp and can be venomous, containing toxins that can cause painful stings.

Body Coloration/Pattern: The body of Tripneustes gratilla is usually dark-colored, while the spines are black. The combination of the dark body and long black spines gives the urchin its common name, the Black Sea Urchin.

Social Behavior: Tripneustes gratilla is primarily a solitary species, but it can aggregate in large numbers in certain areas. It is a herbivorous grazer, feeding on algae and detritus. The urchin plays an important role in controlling algal growth and maintaining the balance of benthic communities in coral reef ecosystems.

Fashion: Tripneustes gratilla 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.

Tripneustes gratilla is an ecologically important species in coral reef ecosystems. It helps control algal overgrowth and promotes the growth of corals and other benthic organisms. However, overfishing and habitat degradation pose threats to its population. The removal of sea urchins from coral reef ecosystems can disrupt the ecological balance and lead to negative impacts on reef health. Conservation efforts, including the establishment of marine protected areas and sustainable fishing practices, are crucial for the preservation of Tripneustes gratilla and the overall health of coral reef ecosystems.