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Echinoderms

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 7000

Echinoderms are a diverse group of marine animals that include sea stars, sea urchins, feather stars, brittle stars, and sea cucumbers. Known for their radial symmetry and textured bodies, they are a common and fascinating sight for scuba divers and snorkelers across coral reefs, sandy bottoms, and rocky coastlines. These slow-moving invertebrates play important roles in ocean ecosystems—sea cucumbers recycle nutrients, urchins help control algae, and sea stars act as natural predators. You’ll often spot them clinging to rocks, crawling across reef flats, or hidden beneath ledges.

© Shutterstock-Ethan Daniels

Some species, like crown-of-thorns sea stars, are large and spiny, while others, such as feather stars, float gently with the current. Their vivid colors and strange forms make echinoderms a favorite among underwater photographers and macro enthusiasts. Next time you dive or snorkel in the tropics or temperate seas, take a closer look—echinoderms are everywhere, quietly shaping the seascape beneath the waves.

Animals in this Category

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 1900

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 950

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 600

The image shown is a representative illustration and does not depict every individual animal in this category.

Total number of species approx.: 1700

Dive Sites with This Animal