Cardiocorax is an extinct genus of elasmosaurid known from the Late Cretaceous (early Maastrichtian stage) Mocuio Formation of Namibe Province, southern Angola.

[1] Cardiocorax is known from the holotype MGUAN PA103 which consists of a complete pectoral and pelvic girdle, five neck and one back vertebrae, a partial forelimb including the humerus, radius bone, ulna and isolated phalanges, and several dorsal ribs.

They were collected from the Mocuio Formation of the Sāo Nicolau Group of Namibe Basin, dating to the early Maastrichtian stage of the Late Cretaceous, 71.40–71.64 million years ago.

Notably, it shows a reduced dorsal blade of the scapula, a feature unique among elasmosaurids, but convergent with the related cryptoclidid plesiosaurs.

[1] Thalassomedon haningtoni Terminonatator ponteixensis Callawayasaurus colombiensis Eromangasaurus australis Cardiocorax mukulu Styxosaurus snowii Hydrotherosaurus alexandrae Elasmosaurus platyurus Libonectes morgani