This report describes the articulating neural arch
in three adult males recovered in Europe and raises awareness that this condition, depending on the diagnostic imaging modality utilized, could be confused with spondylolysis.
Material: Three dorsal vertebra fragments (MG 8809) including a transverse process and a partial neural arch
preserving the prezygapophysis.
Two to five neural arches
are visible in 5 DPH specimens, 15 are present at 7 DPH and 18 by 9 DPH.
angulatus Cope mainly in being smaller with distinctly higher neural arches
. They differ from C.
SEKI-20181 and Diadophis have an acute posterior notch of the neural arch
(versus obtuse for Tantilla).
After soaking in silver nitrate, each neural arch
was rinsed with distilled water to remove any excess solution.
harteri) based on a more elongated vertebral shape; longer, lower neural spine; a more depressed neural arch
; and in having a shorter, more posteriorly directed hypapophysis.
The neural arch
is formed by two pedicles that project posteriorly from the posterior and posterolateral aspect of the body where they join the laminae.
Both vertebrae in UPUAM 14702a present the neural arch
and the dorsal portion of the centrum (Fig.
Therefore, changes are related to enlargement/reduction and consequent deformation of the neural arch
and spine, without marked changes at the vertebral bodies.
Though non-distinguishable, these vertebrae (FS 114, FS 1224.1, FS 566.1, FS 685.1, and FS 1218.1) exhibit the following characters typical of these genera: general shape long and constricted medially; well developed epizygapophyseal spines; thin, long neural spine; thin, relatively uniform in width hemal keel; strong posterior neural spine overhang; and high, domed neural arch
. Masticophis/Coluber vertebrae are the most common elements recovered at the sites.
Vertebral body involvement is not frequent; however, when present, it is usually associated with an already existing neural arch