Asteroidea, commonly known as sea stars or starfish, are echinoderms found in oceans worldwide. They possess a central disc and typically five radiating arms, although some species have more. Sea stars have a unique water vascular system for movement and feeding, and they can regenerate lost arms.

Asteroidea, commonly known as starfish or sea stars, are widely distributed across the world's oceans. They are found in all major ocean basins, including the Atlantic, Pacific, Indian, Southern, and Arctic Oceans. Their natural range encompasses a variety of marine environments, from the intertidal zones to the abyssal depths.

Asteroidea inhabit a diverse range of marine environments. They are found in both tropical and temperate waters, from shallow tidal pools to deep-sea ecosystems. They typically reside on the ocean floor, preferring substrates such as sand, coral reefs, rocky outcrops, and seagrass meadows. The environmental conditions they thrive in vary widely depending on the species, ranging from warm, sunlit waters to cold, dark depths.

Asteroidea play a critical ecological role as both predators and scavengers. They are known for their ability to prey on bivalves, snails, and other small invertebrates. Some species are also opportunistic feeders, consuming detritus and decomposing organic matter. Their presence is vital for maintaining the balance of marine ecosystems, as they help control the population of their prey and contribute to nutrient cycling. Certain species have adapted to specific ecological niches, such as coral reefs or deep-sea environments, demonstrating a variety of feeding strategies and reproductive adaptations to suit their habitat.