"Tanystropheus" and "Dinocephalosaurus" accomplished their extremely elongated necks in different ways. The neck of "Tanystropheus" is composed of 13 elongated cervical vertebrae, whereas the neck of "Dinocephalosaurus" is composed of at least 27 cervical vertebrae that are not as elongated. Among the 27 vertebrae of "Dinocephalosaurus", the longest is the nineteenth, which measures approximately long. By comparison, the longest vertebrae in a Chinese specimen of "Tanystropheus" are the ninth and tenth, which measure long. Additionally, the cervical vertebrae of "Dinocephalosaurus" are not hollow, unlike those of "Tanystropheus".