Dinocephalosaurus is mostly closely compared with Tanystropheus, both being protorosaurs with necks twice as long as their bodies. While Tanystropheus's neck was composed of twelve elongated cervical vertebrae, Dinocephalosaurus's is from the addition of cervical vertebrae with a minimum of 25, giving the neck a length of ~1.7 m compared to a body length of about 1 m. The necks of both taxa are thought to have evolved convergently. The use of the long neck in Tanystropheus is not fully understood, but it was used for prey capture in Dinocephalosaurus. Dinocephalosaurus differed from all other protorosaurs in the fact that it was the only one that was fully aquatic, but is thought to have laid its eggs on land. Where most protorosaurs had ossified limbs adapted for terrestrial life, Dinocep
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| - Dinocephalosaurus is mostly closely compared with Tanystropheus, both being protorosaurs with necks twice as long as their bodies. While Tanystropheus's neck was composed of twelve elongated cervical vertebrae, Dinocephalosaurus's is from the addition of cervical vertebrae with a minimum of 25, giving the neck a length of ~1.7 m compared to a body length of about 1 m. The necks of both taxa are thought to have evolved convergently. The use of the long neck in Tanystropheus is not fully understood, but it was used for prey capture in Dinocephalosaurus. Dinocephalosaurus differed from all other protorosaurs in the fact that it was the only one that was fully aquatic, but is thought to have laid its eggs on land. Where most protorosaurs had ossified limbs adapted for terrestrial life, Dinocep
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| - Dinocephalosaurus is mostly closely compared with Tanystropheus, both being protorosaurs with necks twice as long as their bodies. While Tanystropheus's neck was composed of twelve elongated cervical vertebrae, Dinocephalosaurus's is from the addition of cervical vertebrae with a minimum of 25, giving the neck a length of ~1.7 m compared to a body length of about 1 m. The necks of both taxa are thought to have evolved convergently. The use of the long neck in Tanystropheus is not fully understood, but it was used for prey capture in Dinocephalosaurus. Dinocephalosaurus differed from all other protorosaurs in the fact that it was the only one that was fully aquatic, but is thought to have laid its eggs on land. Where most protorosaurs had ossified limbs adapted for terrestrial life, Dinocephalosaurus "retained juvenile characteristics in the adult stage, as in many other aquatic tetrapods".
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