Shedding light on an isolated skull: A new elasmosaur from the Late Cretaceous of Morocco

Dean Lomax (UK) The bodiless plesiosaur In 2011, a plesiosaur specimen, consisting of an isolated and crushed skull, was described. The collected skull sadly lacked any postcranial remains, but was identified as an elasmosaurid plesiosaur and considered to be something new. Therefore, it was given the name Zarafasaura oceanis. The skull was collected in the Sidi Daoui area, near the city of Oued Zem, situated within the Khouribga Province of the northeast Oulad Abdoun Basin in Morocco. There, the phosphates date to the Maastrichtian Stage of the Cretaceous, the last stage of the Mesozoic Era, famous for many fossils, such as Tyrannosaurus rex from the USA. The study suggested that Zarafasaura shared close connections with other elasmosaurids from the Late Cretaceous of North America and Japan. The elasmosaurs had the longest necks of any plesiosaurs and flourished during the Maastrichtian. It was hoped that future discoveries of more complete remains would shed light on the general appearance and understanding of Zarafasaura. Fig. 1. Mounted skeleton of Zarafasaura oceanis (WDC CMC-01) at the Wyoming Dinosaur Center. (Photograph by Dean Lomax.) ‘The body that fits the head’ In April 2004, seven years before the description of Z. oceanis, an almost complete plesiosaur skeleton was discovered in the Sidi Daoui area in Morocco, at the same location as the skull discussed previously. The specimen (museum number WDC CMC-01) was excavated by a small team and covered by five large plaster jackets (to protect the fragile bones). It was largely articulated, consisting of a … Read More

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