Hydrostatic skeleton
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A hydrostatic skeleton or hydroskeleton is a type of skeleton supported by hydrostatic fluid pressure or liquid, common among soft-bodied invertebrate animals colloquially referred to as "worms". Whil
The hemichordates are among the many marine animals with hydrostatic skeletons and peristaltic locomotion.
Endoskeleton
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An endoskeleton is a structural frame — usually composed of mineralized tissue — on the inside of an animal, overlaid by soft tissues. Endoskeletons serve as structural support against gravity and mec
Hydrostatic skeleton
…and tapir proboscises also utilize a muscular hydrostat. These structures are composed of longitudinal fibers surrounded by radial and helical fibers. Endoskeleton Exoskeleton…
Endoskeleton of a swordfish
A human skeleton on display at Booth Museum of Natural History
Fossilized skeleton of various dinosaurs
The skeleton of a kitefin shark, a cartilaginous fish