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Dwarf brittle star

Amphipholis squamata

Amphipholis squamata is a small brittle star, often found hiding under cobbles at the low shore. Unlike a starfish, the brittle star doesn't have organs in the arms, and its mouth and anus are just one orifice on the underside of the central disc. Brittle star locomotion is also different to starfish as A. squamata will use two of its five arms to pull itself along rather than using its tube feet (which it uses to bring food to the mouth). This hermaphroditic brittle star broods its eggs in slits near where the arm attaches to the disc - essentially its armpit!

Source 1: https://www.marlin.ac.uk/species/detail/2071
Source 2: https://www.sealifebase.ca/summary/Amphipholis-squamata.html