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Illustration of the skeletal anatomy of a Plesiosaurus dolichodeirus from Conybeare's 1824 paper that described an almost complete plesiosaur skeleton found by Mary Anning in 1823. Plesiosaurus was a moderately sized plesiosaur that grew to 2.87–3.5 m (9.4–11.5 ft) in length.
Generally, the parietal bones were very large, with a midline crest, while the squamosal bones typically formed an arch, excluding the parietals from the occiput. The eye sockets were large, in general pointing obliquely upwards; the pliosaurids had more sideways directed eyes.
The paired parietal is the hindmost bone of the skull roof. A dermal bone, it is located behind the frontals, and roofs the braincase. [25]: 38 [1]: 141 [20] parietal fenestrae The parietal fenestrae are a pair of window-like openings commonly found in the neck frills of ceratopsians.
Bones of Leptocleidus superstes: Yuzhoupliosaurus chengjiangensis. Bathonian [11] Bathonian [11] Bathonian [11] Brancasaurus brancai. Berriasian [5] Berriasian [5] Berriasian [5] Skeleton of Brancasaurus brancai: Muraenosaurus leedsi. Callovian [5] Callovian [5] Callovian [5] Life restoration of Muraenosaurus leedsi: Cryptoclidus richardsoni ...
Elasmosaurus differed from all other plesiosaurs by having 72 neck vertebrae; more may have been present but were later lost to erosion or after excavation. Only Albertonectes had more neck vertebrae, 76, and the two are the only plesiosaurs with a count higher than 70; more than 60 vertebrae is very derived (or "advanced") for plesiosaurs. [14 ...
In non-human vertebrates, the parietal bones typically form the rear or central part of the skull roof, lying behind the frontal bones. In many non-mammalian tetrapods , they are bordered to the rear by a pair of postparietal bones that may be solely in the roof of the skull, or slope downwards to contribute to the back of the skull, depending ...
The pterion is the region where the frontal, parietal, temporal, and sphenoid bones join. [1] It is located on the side of the skull, just behind the temple.It is also considered to be the weakest part of the skull, which makes it clinically significant, as if there is a fracture around the pterion it could be accompanied by an epidural hematoma.
Like all plesiosaurs, Polycotylus was a large marine reptile with a short tail, large flippers, and a broad body. It has a short neck and a long head, and was a medium-sized plesiosaur, with the type species (P. latipinnis) measuring 4.7–5.4 metres (15–18 ft) long. [4] [5] It has more neck vertebrae than other polycotylids, however.