The composite mesoglea of jellyfish and sea anemones provides structural support using collagen fibers in a complex gel matrix.

References

"Then there's the jelly of jellyfish and sea anemones (mesoglea), made up of sparse collagen fibers in a complex gel matrix." (Vogel 2003:305)

Book
Comparative Biomechanics: Life's Physical World, Second EditionPrinceton University PressFebruary 26, 2017
Steven Vogel