Description: This vertebra probably corresponds to a subadult individual because the neural arch and the caudal ribs are not fully fused (Fig.
Nevertheless, the absence of the neural arch in MG 4800 prevents us from testing the presence of this feature in this specimen.
The widths between bands were asymmetrical along the whole edge of the neural arch.
The number of bands per neural arch increased with total length of the shark, suggesting their potential for age determination.
6-11] In general, cervical vertebrae have a small body in comparison to a larger
neural arch.
The overall shape (squareness), robustness, and low
neural arch of the vertebra are characteristic of the genus Crotalus.
The parapophyses are located entirely on the neural arch, together with the diapophyses, forming a step-like prominence on the anterior edge of the transverse process, as in other metriorhynchids (Andrews, 1913; Wilkinson et al.
MPZ 2001/130 c would be at least the second dorsal vertebra: the parapophyses and diapophyses together form the transverse process and are wholly on the neural arch.
Delapparentia is the only taxon among the iguanodonts and basal ornithopods so that the height of the axial neural spine from the base of the postzygapophysis is clearly greater than half the length of the
neural arch (Fig.
The
neural arch is high and the neural spine, almost complete, is a subrectangular lamina in lateral view, dorsocaudally directed.
The two vertebrae (12531) are similar to specimens of the genus Thamnophis and differ from those of Nerodia and Regina in being more gracile, narrower through the
neural arch region, and in having narrower, more posteriorly directed hypapophyses (Parmley, 1988b).
First, the ratio of the
neural arch height (measured from the top of the centrum to the base of the prezygapophyses) to the neural canal height is approximately 2.
