Gray Sea Star
ExploreAnimal
Gray Sea Star
luidia clathrata
The Gray Sea Star (Luidia clathrata) is an active and fascinating marine echinoderm native to the warm coastal waters of the western Atlantic. Unlike many of its slow-moving, rock-climbing relatives, this species is highly adapted for a dynamic life on soft, shifting sediments. Lacking the typical suction-cupped tube feet, it features pointed, agile tube feet that allow it to glide smoothly and rapidly across sandy and muddy sea floors, or quickly burrow beneath the surface to hide from predators or ambush prey.
Habitat: Found in shallow coastal waters, typically on soft sandy or muddy sea floors where it can easily burrow.
Appearance
This sea star typically features five long, flattened, tapering arms radiating from a relatively small central disc, reaching an overall diameter of 15 to 30 centimeters. Its coloration ranges from light bluish-gray to creamy gray or light brown, and it is easily recognized by a distinct, dark gray or blackish stripe running down the midline of the upper surface of each arm. The upper body is covered with tiny, table-like structures called paxillae that give it a finely granulated texture, while its underside reveals pale, pointed tube feet.
KingdomAnimaliaPhylumEchinodermataClassAsteroideaOrderPaxillosidaFamilyLuidiidaeGenusLuidia
Category
AnimalRarity
Common
Danger
1/5 · Very low
Snaps
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Interesting facts
It has the impressive ability to swallow small prey items, such as clams, completely whole; it then digests the soft tissues internally and spits the empty, clean shells back out.
The distinct dark line down the middle of its arms is formed by a precise biological alignment of its paxillae—tiny, umbrella-shaped skeletal plates that keep sand off its sensitive skin.
Unlike most sea stars that rely on suction cups to scale hard vertical rocks, the Gray Sea Star features pointed, claw-like tube feet uniquely adapted for scurrying over and tunneling into sand.
Special abilities
Ability
Rapid Sand Burrowing
Uses its specialized, pointed tube feet to quickly shovel sand aside, allowing it to sink beneath the sediment within seconds to avoid predators or search for food.
Ability
Autotomy and Regeneration
Can voluntarily shed an arm when threatened or seized by a predator, later regenerating a complete new arm over several months.
Ability
Suckerless Gliding
Moves surprisingly fast over soft substrates using coordinated, stilt-like walking motions of its pointed tube feet rather than suction-cup crawling.
Measurements & details
- Length
- 15+ cm
- Weight
- 0.05+ kg
- Lifespan
- 3+ years
Diet & Feeding
Primarily feeds on small, burrowing invertebrates such as bivalves, gastropods, and small crustaceans, which it swallows whole or digests externally.
Age differences: Juveniles feed on organic detritus and microscopic organisms in the sediment, while larger adults target shelled mollusks and active crustaceans.
Primary Foods
- Coquina Clams
- Dwarf Surfclams
- Amphipods
- Polychaete Worms
Foraging Method
- Foraging
Ecological connections
hunts
Coquina Clam
Donax variabilis
Preys heavily on this small, burrowing bivalve found in the same sandy littoral zones.
competitor
Beaded Sea Star
Astropecten articulatus
Competes for sandy benthic space and similar small infaunal invertebrate prey.
eaten by
Gag Grouper
Mycteroperca microlepis
This predatory fish occasionally feeds on juvenile and adult Gray Sea Stars.
Traits
No trait badges are assigned for this object yet.
Also known as
No aliases listed yet.
Collections
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Safety
Danger
1/5 · Very low
No special safety notes yet.
Frequently Asked Questions
How to identify Gray Sea Star?
The easiest way to identify Gray Sea Star is to use the Snappit nature identifier app.
How long is Gray Sea Star?
15+ cm
How much does Gray Sea Star weigh?
0.05+ kg
How long does Gray Sea Star live?
3+ years
What does Gray Sea Star eat?
Primarily feeds on small, burrowing invertebrates such as bivalves, gastropods, and small crustaceans, which it swallows whole or digests externally.
Where is Gray Sea Star usually found?
Found in shallow coastal waters, typically on soft sandy or muddy sea floors where it can easily burrow.
How does Gray Sea Star hunt?
Foraging
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