Sea Star

Asterias rubens

Sea stars, also known as starfish, are fascinating creatures found in oceans around the world. They have multiple arms and come in various colors like orange, red, and blue.

Habitat: Coastal areas

Appearance

The Sea Star has a distinctive five-arm radial shape, often vibrant red, orange, blue, or purple. Its body surface can be spiky or bumpy, differentiating it from smooth marine creatures. Many have intricate patterns.

KingdomAnimaliaPhylumEchinodermataClassAsteroideaOrderValvatidaFamilyAsterinidaeGenusAsterina

Sea Star

Interesting facts

Many sea stars have over 40 arms, making them look like a spiky pom-pom!

Sea stars use seawater, not blood, flowing through a special water vascular system!

Their skin has tiny pincers (pedicellariae) that keep them clean and protected!

Upside down? Sea stars use tube feet to slowly flip themselves right side up!

Special abilities

Sea Star can regrow lost arms because of specialized cells that help them recover from injury or predator attacks.

Sea Star can push its stomach out to digest food externally, helping them eat larger, shell-bound prey.

Sea Star has hundreds of tiny tube feet that help them powerfully grip surfaces and slowly move along the seafloor.

Sea Star has simple eye spots at the tip of each arm that help them detect light and dark, aiding navigation.

Measurements & details

Average Length: 10-30 cm
Average Weight: 0.1-0.5 kg
Average Lifespan: 5-10 years
Speed: 0.001-0.005 km/h
Habitat Depth: 0-200 m

Diet & Feeding

Sea stars are often hunters of shellfish, using their unique stomach to eat their meals.

Primary Foods

bivalves (clams, mussels)
gastropods (snails)
barnacles
detritus

Foraging Method

Foraging

Ecological connections

eaten by

Sea Otter

Enhydra lutris

A key predator in kelp forests, often consuming sea stars.

eats

Blue Mussel

Mytilus edulis

A primary food source, pried open and digested externally.

eats

Eastern Oyster

Crassostrea virginica

Feeds on this bivalve, sometimes impacting oyster beds.

eaten by

Red Rock Crab

Cancer productus

Larger crabs may prey on smaller or injured sea stars.

Traits

Filter Feeder

Discover amazing animals that filter their food right from the water! They have special ways to strain tiny bits of plants or other creatures to eat.

Ancient Lineage

These fascinating organisms carry echoes of the deep past, with ancestors that have roamed the Earth for an incredible span of time. They are living links to ancient worlds!

Coastal

Discover life found along the edges where land meets the sea! These habitats are always changing with the tides and waves, offering unique environments.

Carnivorous

Discover fierce hunters and clever predators that get all their energy from eating other animals. They play a vital role in keeping nature's balance.

Keystone Species

Discover the hidden heroes of nature! These special species play an incredibly important role in their habitat, holding the entire ecosystem together like a crucial piece of a puzzle.

Regenerative

Imagine if you could grow back a lost arm or tail! Some incredible creatures have the power to regrow body parts, making them truly amazing survivors in nature.

Marine

Dive into the vast, salty waters of the ocean, teeming with an incredible diversity of life, from tiny plankton to giant whales! It's a watery wonderland.