Common name: Lesser Sand Dollar

General information

The Lesser Sand Dollar, Brissus latecarinatus, is a species of burrowing sea urchins found in sandy substrates. Unlike their close relatives, the more familiar sand dollars of the genus Echinarachnius, Brissus latecarinatus is less commonly seen due to its burrowing habits. This species is characterized by its flattened, disk-like body and petaloid pattern on the upper surface, which is actually an arrangement of pores that facilitate gas exchange.

Care

In the aquarium, Brissus latecarinatus requires a tank with a deep sand bed to mimic its natural burrowing environment. The sand should be fine-grained and at least several inches deep to allow for natural behavior. They are detritivores, feeding on organic matter within the sand, so maintaining a clean substrate is crucial for their health. They are sensitive to water quality and require stable conditions with low nitrate levels.

Reproduction

Reproduction in Brissus latecarinatus is typically sexual with external fertilization. During spawning events, males and females release sperm and eggs into the water column, where fertilization occurs. The larvae are planktonic before settling to the bottom and metamorphosing into juvenile urchins.

Symbiosis

While Brissus latecarinatus does not have notable symbiotic relationships like clownfish with anemones, its burrowing behavior can play a role in aerating the substrate, which can indirectly benefit other tank inhabitants by promoting a healthy sand bed ecosystem.

Habitat

Brissus latecarinatus is found in tropical and subtropical seas, typically in areas with sandy bottoms where it can burrow. It is important for hobbyists to replicate this environment to ensure the well-being of the species in captivity.