Genus: Haestasaurus UPCHURCH, MANNION & TAYLOR, 2015
Etymology: From "Haesta", the name of the putative pre-Roman chieftain whose people apparently settled the area of Hastings and gave the town its name and Greek, sauros, "reptile."

Species: becklesii (MANTELL, 1852) UPCHURCH, MANNION & TAYLOR, 2015
= ? becklesii MANTELL, 1852 (nomen dubium)
Etymology: In honor of Beckles.
= Pelorosaurus becklesi MANTELL, 1852
= Morosaurus becklesi (MANTELL, 1852) MARSH, 1889

Holotype: NHMUK (old BMNH) R1870, 1868

Locality: Exact locality unkown, on the coast near Hastings, East Sussex County, England, Southern United Kingdom.

Horizon: Hastings Beds Group (old Lower Wealden Formation).


Age: Upper Berriasian-Valanginin Stage, Lower Gallic Subepoch, Middle Early Cretaceous Epoch, Early Cretaceous.


NHMUK (old BMNH) R1870: Left humerus, left ulna and left radius.

NHMUK (old BMNH) R1868: Skin impressions.