Haestasaurus

An san Haestasaurus ne ta hanyar ƙashin hannu na sama (humerus), ƙashin gaban hannu (ulna), radius, da kuma alamar fata. Fatar ita ce fatar dinosaur ta farko da masana kimiyya suka gane.12

Masana kimiyya sun ƙirƙiri sabon sunan Haestasaurus a shekarar 2015 saboda tsohon sunan Pelorosaurus ana amfani da shi ne don wasu ƙasusuwan daban a binciken da aka yi a baya.1

Ƙasusuwan sun fito ne daga rukunin Hastings Beds, waɗanda suke da shekaru kusan 139 zuwa 133 miliyan (farkon zamanin Cretaceous).4

Haestasaurus yana da ƙashin gaban hannu (ulna) mai kauri da ƙarfi sosai, amma yana da ƙashin radius siriri a gefensa. Wannan haɗin da ba a saba gani ba yana taimaka wa masana kimiyya su bambanta shi da sauran sauropods.1

Ƙashin hannun na sama yana da wani ɓumbutu mai kama da ƙugiya a ƙasan kusurwarsa ta ciki. Wannan ɓumbutu wani abu ne na musamman da ba a gani a kowane irin sauropod ba.1

An rarraba Haestasaurus a matsayin macronarian, wani rukuni na sauropods wanda ya haɗa da manyan titanosaurs. Amma masana kimiyya ba su da tabbas ko ya kasance ɗan titanosaur na farko ko kuma wani dangi na kusa da su.1

Alamar fatar tana nuna ƙananan ƙwayoyin fata masu zagaye. Wannan ita ce shaida ta farko da ta nuna cewa sauropods suna da fatar ƙwayoyi, ba gashin tsuntsu ba.2