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Ichthyosaurus’ large eyes and robust skeletal structure suggest it was capable of deep diving. This trait allowed them to withstand the deep water pressure and exploit a range of ecological niches.

“We’ve been studying structure-function relationships in sponge skeletal systems for more than 20 years, and these species continue to surprise us,” says study author James Weaver.

A computer-generated Voronoi pattern had an 82 percent match with the pattern found in sea urchin skeletons. This arrangement, the team suspects, yields a strong yet lightweight skeletal structure.

Adult skeleton: Contains 206 bones Bone marrow: Red marrow makes blood cells. Yellow marrow stores fat Two types of bone: Dense compact bone and lightweight spongy bone ...

This article was originally published with the title “The Structure of the Skeleton in Invertebrate Animals” inSA Supplements Vol. 86 No. 2242supp(December 1918), p. 386doi:10.1038 ...