Pisaster giganteus

Pisaster giganteus

The Pacific sea star, or Pisaster giganteus, is a colorful starfish found in the ocean. It has five arms and can be purple, orange, or even yellow! These starfish love to cling to rocks and explore the tide pools.

Habitat: Coastal areas

Appearance

The Pisaster giganteus is a large sea star, typically purple, brown, or red, often adorned with prominent, blunt white spines that form a striking network across its dorsal surface. Its five robust arms radiate from a central disc.

KingdomAnimaliaPhylumEchinodermataClassAsteroideaOrderForcipulatidaFamilyAsteriidaeGenusPisaster
Pisaster giganteus
solitary trait badgecolorful trait badgefilter_feeder trait badgecoastal trait badge
Pisaster giganteus

Category

Invertebrate

Rarity

Common

Danger

1/5 · Very low

Snaps

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Interesting facts

Giant sea stars don't have a brain or blood, but they still thrive!

Some giant sea stars surprisingly have six or even seven arms!

Their entire body is covered in tiny, hard skeletal plates called ossicles.

They breathe using tiny, feathery skin gills all over their back!

Special abilities

Ability

Arm Regeneration

Pisaster giganteus can regrow lost arms because of specialized cells that helps them recover from injury.

Ability

Sticky Steps

Pisaster giganteus has hundreds of powerful tube feet that help them cling tightly to rocks and slowly crawl across the seafloor.

Ability

Stomach Flip

Pisaster giganteus can push its stomach outside its body to digest prey, which helps them eat large or shelled animals.

Ability

Sensory Search

Pisaster giganteus can sense chemicals in the water, which helps them detect prey like mussels from a distance.

Measurements & details

Length
10-30 cm
Weight
0.5-3 kg
Lifespan
10-20 years
Top Speed
0.01 km/h

Diet & Feeding

A slow but mighty hunter, this sea star feasts on shelled creatures like mussels and barnacles.

Primary Foods

  • mussels
  • barnacles
  • limpets
  • snails
  • tube worms

Foraging Method

  • Foraging

Ecological connections

eats

California mussel

Mytilus californianus

They are a favorite prey for this sea star.

eats

Acorn barnacle

Balanus glandula

These sea stars pry open and digest barnacles.

eaten by

Sea otter

Enhydra lutris

Sea otters sometimes prey on sea stars.

eaten by

Western gull

Larus occidentalis

Gulls may eat sea stars exposed at low tide.

Traits

Also known as

Giant Sea StarPacific Sea Star

Safety

Danger

1/5 · Very low

Don't touch sea stars without asking an adult, as they need to stay in their ocean home.

Frequently Asked Questions

How long is Pisaster giganteus?

10-30 cm

How much does Pisaster giganteus weigh?

0.5-3 kg

How long does Pisaster giganteus live?

10-20 years

How fast can Pisaster giganteus move?

0.01 km/h

What does Pisaster giganteus eat?

A slow but mighty hunter, this sea star feasts on shelled creatures like mussels and barnacles.

Where is Pisaster giganteus usually found?

Coastal areas

How does Pisaster giganteus hunt?

Foraging

Snap Map

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Recent Snaps

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Where to spot

More Invertebrate