Kentrosaurus
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| phylum | Chordata | Kentrosaurus fossils have been found only in the Tendaguru Formation of Tanzania, dated to the Kimmeridgian stage, between about 155.7 Ma and 150.8 Ma (million years ago). Apparently, all finds belong to one species, K. aethiopicus Hennig 1915. Often thought to be a primitive member of the Stegosauria, several recent cladistic analyses find it to be derived, and a close relative to Stegosaurus from the North American Morrison Formation. Kentrosaurus generally measured around 4.5 metres (15 ft) in length as an adult, probably had a double row of small plates and spikes running down its back, and could use its tail as a "thagomizer" for defense.
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| clade | Diapsida | |
| order | †Ornithischia | |
| Infraorder | †Thyreophora | |
| family | †Stegosauridae | |
| genus | †Kentrosaurus | |
| species | †K. aethiopicus | |
| Period | Late Jurassic |
