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Why are cervical half rings considered all from left side and not the right side?
Were you unaware of are paper describing Europelta as a Early Cretaceous struthiosaurine nodosaurid relative to Struthiosaurus?
A little more details on why you interpreted the osteoderm locations as they appear here would be appreciated.
Osteoderm "E" may be in an incorrect location, or the unknown osteoderms around it may be incorrect. As per Jim Kirkland, Europelta, which is most likely a close relative of Struthiosaurus, as well as possibly Stegopelta show what appears to be a pelvic shield, which is also present in some basal ankylosaurian taxa. If Struthiosaurus was armoured similar to these relatives, the osteoderms with attached dermal ossicles (E and J) would have been part of these pelvic shields. As such, they would likely be surrounded completely be other fused dermal ossicles, not small keeled osteoderms as you show.
Also, since the neck is very incompletely known, I would recommend refraining from making statements about its flexibility with any implication of it being certain or probably correct.
Due to the description of Hungarosaurus and Struthiosaurus languedocensis, it's arguable whether all non-osteoderm, non-cranial material can be assigned to S. austriacus because of Bunzel and Seeley provided no quarry map showing spatial relationships of the Grunbach ankylosaur remains. In particular, the fibulae were originally described as part of the Rhadinosaurus alcinus hypodigm and because ankylosaur fibulae are non-diagnostic to genus or species-level, the R. alcinus fibulae might not belong to S. austriacus at all. Also, the best bet could be to designate one of the two scapulae originally included in the Danubiosaurus anceps hypodigm (PIUW 2349/A2) as the D. anceps lectotype and designate the other D. anceps syntype scapula (PIUW 2349/B9) in Nopcsa's 1929 catalog) as the lectotype of Crataeomus pawlowitschi, while designating PIUW 2349/1 as the lectotype of Crataeomus lepidophorus (effectively making all other C. lepidophorus syntypes paralectotypes) effectively avoiding nomenclatorial complications.