On the other hand, according to the relationships between the tail width and the caudal vertebra
width, the thickness of the tail variation was caused by the soft tissue around the caudal vertebrae (Figs.
Mateus (2005) referred this caudal vertebra to an indeterminate theropod.
One of the proposed autapomorphies for this taxon is the presence of a circular spinoprezygapophyseal fossa (sprf) on the anterior caudal vertebra, also described in Jobaria (Sereno et al., 1999).
Description: Partial middle caudal vertebra lacking the neural arch (Fig.
Anal-fin rays 26-33 (30), 7-12 (9) pterygiophores anterior to first caudal vertebra. Pectoral-fin rays 13-17 (15), rays 4-11 pigmented.
Anal-fin rays 30-33 (31), 10-13 (12) pterygiophores anterior to first caudal vertebra. Pectoral-fin rays 14-17 (15), rays 4-10 (7) pigmented.
MPZ 2001/130d is a caudal vertebra. It has transverse processes that are dorsoventrally flattened and ventrally deflected, fused to the centrum, and a tall and vertically oriented neural spine.
It has a chevron facet, which indicates that it is a caudal vertebra. Metriorhynchid material from the posterior axial column is scarce.
First caudal vertebra with two canals, a small proximal one at base of haemal arches, which fuse in midline briefly before diverging again to form posteriorly directed funnel-like second arch.
Abdominal/caudal vertebral pattern is Type B, but haemal arch of second caudal vertebra is somewhat enlarged.
Vertebral transition a modified Type A, with the tenth abdominal and first caudal vertebrae (only) with a small basal haemal canal, the main haemal arch of the first caudal vertebra expanded, that of the second about half the size of the first, remaining caudal haemal arches normal; swimbladder terminates at the haemal canal of second caudal vertebra.