Before revision: Vertebrates are the predominant animal clade with endoskeletons (made of mostly bone and sometimes cartilage), although sponges also have evolved a mesh-like form of endoskeletons made of diffuse calcite/silica structural elements called spicules, and echinoderms have a dermal calcite endoskeleton known as ossicles.
After revision: invertebrates such asVertebrates are the predominant animal clade with endoskeletons (made of mostly bone and sometimes cartilage), although sponges also have evolved a mesh-like form of endoskeletons made of diffuse calcite/silica structural elements called spicules, and echinoderms have a dermal calcite endoskeleton known as ossicles.