Red-knobbed starfish

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Red-knobbed starfish
Scientific classification
Kingdom: Animalia
Phylum: Echinodermata
Class: Asteroidea
Order: Valvatida
Family: Oreasteridae
Genus: Protoreaster
Species: P. linckii
Binomial name
Protoreaster linckii
(Blainville, 1834)

The red-knobbed starfish (Protoreaster linckii), also known as the red spine star, African sea star,[1] and the African red knob sea star,[2] is a species of starfish from the Indo-Pacific.[3][4]


P. linckii grows to a maximum diameter of 12 in (30 cm). It has numerous tubercles located along its five arms. These tubercles are bright red and extend upward from the arms. It has a gray body with stripes that connect the tubercles. This creates an appearance of a grid made of interconnecting wires.[5]

The skeleton is composed of many calcareous ossicles and spicules. They are located inside the layer of connective tissue. This skeleton supports the large disk.[6]

It is distributed in the Indo-Pacific region[7][8] in locations ranging from shallow tidal pools to reefs up to 100 m (330 ft) deep.[9]

Behaviour and diet[edit]

Underside of Protoreaster linckii

P. linckii is active in the daytime.[10] It is a popular aquarium specimen, but is considered incompatible with many other invertebrates, as it will eat soft corals, sponges, tube worms, clams, other starfish, and alike.[11]


External links[edit]