star fish

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Watercolor sea collection - blue shells, seahorse, sea star. Original hand drawn illustration in vintage style Royalty Free Stock Photo

Blue starfish isolated on white background Royalty Free Stock Photo

Sea poster with sea star fish phrase Hello summer, wave, seastar Vector typographic banner inspirational quote. Royalty Free Stock Photo

Starfish are marine invertebrates. They typically have a central disc and five arms, though some species have a larger number of arms. The aboral or upper surface may be smooth, granular or spiny, and is covered with overlapping plates. Many species are brightly coloured in various shades of red or orange, while others are blue, grey or brown. Starfish have tube feet operated by a hydraulic system and a mouth at the centre of the oral or lower surface. They are opportunistic feeders and are mostly predators on benthic invertebrates.