User:Daisysandpeaches/Yixianopterus/Bibliography

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Shun-Xing: description of the specimen found. Right forelimb- preserved in the Jingganshan bedding of Yixian formation. bedding typically associated with fish, ephemerid(mayfly), and plant fragments. there was an outline of the head preserved showing a dorsal inclination of the deltopectoral crest, a characteristic of Pteranodontoidea. Foot was almost completely preserved allowing ratios to be taken and analyzed. (Kellner et al. 2019) defined the ratio between metatarsal 3 and tibia as typical of Ornithocheiroidea. Teeth are triangular and labiolingually compressed (towards lips), a feature assigning specimen to Pteranodontoidea as well. Teeth have a vertical occlusal surface(fit together). First two teeth are notably more slender and longer. (Lu et al. 2006) noted the specimen teeth to be subequal, and diastema increasing posteriorly, as well as ratios between metacarpals, phalanx, and ulna.

Qin et al 2019: further information on Jingganshan bedding-uppermost layer of Yixian formation. Lower Cretaceous. Formation containing basalts with siliciclastic sediments. The specimen is a part of the Jehol Biota, the collection of all living organisms in North East China 133-120mya. It is a snapshot in time of the ecosystem of the lower Cretaceous preserved in the Yixian formation.