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Wiggly squid or jellyfish with many tentacles.
A muscular hydrostat is a biological structure used to move its host
about, consisting of muscles with no skeletal support. It performs
its hydraulic movement without fluid in a separate compartment, as in
a hydrostatic skeleton.
https://en.wikipedia.org/wiki/Muscular_hydrostat
Written by Justin Windle and Jamie Zawinski; 2016.