| Cartilage too forms flexible parts of the endoskeletal system of vertebrates, such as between articulating bones and forming sections of ribs. |
| The skeleton of the primitive fin consists of a series of endoskeletal rods, each of which undergoes subdivision into a series of three or four pieces. |
| Connective-tissue fibres form substantial endoskeletal units in arthropods. |
| The skeletal structures found in Balanoglossus are all endoskeletal. |
| In tailed amphibians, such as newts and salamanders, the dermal elements of the pectoral girdle have been completely lost, and only the endoskeletal parts remain, mainly in the form of cartilaginous bars. |
| The neural and costal plates of the dorsal disk form as the outgrowths of these endoskeletal bones on inside the dermis. |
