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
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
Echinoderm
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An echinoderm is any animal of the phylum Echinodermata, which includes starfish, brittle stars, sea urchins, sand dollars and sea cucumbers, as well as the sessile sea lilies or "stone lilies". While
A brittle star, Ophionereis reticulata
A sea cucumber, Stichopus chloronotus, from Malaysia
Starfish of varied colours