Indo-pacific Comb Star

Overview

The Indo-Pacific Comb Star is a widespread sea star recognized by the distinct, comb-like rows of sharp spines lining its five arms. Primarily nocturnal, this species is well-adapted for life on soft substrates, where it spends much of the daylight hours buried beneath the sediment.

Appearance

This sea star features a flattened body with a dark purple, brown, or greyish-green upper surface and a cream to deep orange underside. Its arms are relatively broad and fringed with prominent, sharp marginal spines. A key identifying feature is a noticeable gap in the spine series along the arms, typically caused by reduced plates near the base. Unlike many other sea stars, it possesses pointed, suckerless tube feet, which are specialized for efficient movement through sand rather than gripping hard surfaces.

Distribution & habitat

Found throughout the tropical Indo-Pacific region, this species ranges from the Red Sea and East Africa to Japan, Australia, and parts of the Pacific. It favors sandy or muddy bottoms in shallow estuaries, harbors, and continental shelf areas.

Feeding

As a predator, the Indo-Pacific Comb Star feeds on buried invertebrates such as bivalves and snails. Because it cannot evert its stomach to digest prey externally, it ingests smaller prey items whole and later discards any indigestible remains. It may also scavenge for organic matter within the sand.