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
Sea cucumber
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Sea cucumbers are echinoderms from the class Holothuroidea. They are benthic marine animals found on the sea floor worldwide, and the number of known holothuroid species worldwide is about 1,786, with
Endoskeleton
…ways such as the chewing organ in sea urchins called "Aristotle's lantern", the supportive stalks of crinoids, and the structural "lime ring" of sea cucumbers. The poriferan "skeleton" consists of mesh-like network of microscopic spicules. The soft connective tissues of sponges are composed of gelatinous…
Thelenota ananas, a giant sea cucumber from the Indo-Pacific tropics
Details of the mouth with its tentacles.
Synaptula lamperti lives on sponges (here in Indonesia).
Synapta maculata, the longest known sea cucumber (Apodida).