Thyreophora, Nopcsa, 1915 ANKYLOSAUROMORPHA Carpenter, 2001

Norman, David B, 2021, Scelidosaurus harrisonii (Dinosauria: Ornithischia) from the Early Jurassic of Dorset, England: biology and phylogenetic relationships, Zoological Journal of the Linnean Society 191 (1), pp. 1-86 : 69

Clade THYREOPHORA

S t e m -b a s e d d e f i n i t i o n: A l l t a x a m o r e c l o s e l y related to Euoplocephalus and Stegosaurus than to Hypsilophodon .

The possibly node-based definition: The common ancestor of Stegosauria (Stegosaurus) and Ankylosauria ( Euoplocephalus and Edmontonia ) and all of its descendants, is exclusive and risks leading to the generation of new taxonomic names for stem-lineage thyreophorans when they have been discovered – or currently known taxa are re-positioned there following revision/updating.]

Total characters under ACCTRAN 17, DELTRAN 12 – (see Supporting Information, Appendix S3 for details):

1. Anterior supraorbital (palpebral) bound to the anterodorsal orbital margin.

2. Postorbital (and posterodorsal orbit margin) obscured by osteoderm(s).

3. Mandibular condyles of the quadrate: medial condyle larger than the lateral.

4. Median vomeropterygoid keel is deep (approaching or touching snout roof).

5. Dorsal margin of the dentary in occlusal view mildly bowed medially.

6. Fourth trochanter positioned at midlength on the femoral shaft.

7. Transverse width of the distal femur greater than the depth of the medial condyle.

8. Osteoderms form parasagittal rows either side of the dorsal midline.

9. Osteoderms extend along the caudal series.