MCF-PVPH-74: Partial skeleton w/ skull material, including partial left
maxilla w/ tooth, dentaries, ventral braincase, 4 cervicals, 4 dorsal arches, 4 sacrals, 2 caudals & 10 caudal centra, nearly complete pectoral girdle & left forelimb, proximal end of right humerus, nearly complete left hindlimb w/ pes missing metatarsal I, and proximal right metatarsal III and metatarsal V Hypodigm APK:10/90: MCF-PVPH-75 headless partial skeleton including parts of 3 cervicals, 4 dorsals, one sacral centrum, and 8 caudals, both scapulae, distal end of right humerus, partial pelvic girdle, partial left and right hindlimbs; MCF-PVPH-76 incomplete postcrania including 3 sacral centra, 6 caudal centra, 4 fragmenary caudal neural arches, right scapula, left pelvis, partial right ilium, left & right femora, right tibia & fibula, proximal metatarsal II, phalanx; and MCF-PVPH-77, articulated tail, partial left scapula, humerus, tarsus; all in addition to holotype specimen

COMMENTS BY MICKEY MORTIMER

Material

 (MCF-PVPH-74, 75, 76, 77) (2 m) five individuals

Diagnosis

Scapula with very strong acromion process; flattened fifth metacarpal; preacetabular process more than 50% of total ilial length; preacetabular process extends anteriorly past prepubic process; ischiadic shaft proximally triangular and distally quadrangular in cross section; tarsus with fibular-astragalar contact.

Description

This species is known from at least five individuals, all about two meters long.

The prepubic process is flattened.  The obturator process is placed proximally.  Metatarsal I is still present with two phalanges, one of which is an ungual.

No further description is added as all additional released anatomical information can be found in the diagnosis and realtionships sections and no illustrations have been published.

Relationships

Coria places this species in the Iguanodontia based on- dentary with parellel margins; iliac blade with sinuous dorsal margin; femur with deep anterior intercondylar groove; a condylid slightly overlapping the posterior intercondylar groove.  He places it in the Euiguanodontia based on- strong promary ridges on maxillary teeth; well-developed brevis shelf; reduced metatarsal I.  It is a more derived euiguanodontian than Gasparinisaura based on- ischial shaft rounded in cross section and ischial foot present.  Whether this form is the sister group to dryomorphans, a dryosaurid or an ankylopollexian will have to wait until the description is published (Coria and Calvo in press).

References

Coria, R. A., 1999. Ornithopod dinosaurs from the Neuquén Group, Patagonia, Argentina: Phylogeny and biostratigraphy. in Tomida, Y., Rich, T. H. & Vickers-Rich, P., eds., 1999. Proceedings of the Second Gondwanan Dinosaur Symposium, National Science Museum Monographs #15, Tokyo: 47–60.