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|Morphology||Ecology and taphonomy||External Literature Search||Age range and collections|
Reptilia - Sauropterygia
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|Owen 1842||Characterised by unusual concavity of the terminal articular surfaces of the centrum. on making a section of two of thee vertebrae cemented by the matrix in their natural state of co-adaptation, the margins of the opposed articular surfaces were two lines apart, showing the thicknesss of the inter-articular connecting ligamentous substance at that part, while the middle of the articular surfaces left an interval of eleven lines, thus approaching the ichthyosaurian type of vertebral union. The following were the dimensions of the centrum of these cervicals: length, 1 inch, 9 lines, breadth of articular surfaces, 1 inch, ii lines, height of ditto, 1 inch, 10 lines. The inferior surface of the centrum showed a median convex longitudinal ridge between the two wide elliptical venous foramina. I named the species indicated by these vertebrae Plesiosaurus coelospondylus, in reference to the hollow terminal articular surfaces. i hope to have, at a future opportunity, further means of illustrating this species.|