English: Estimated size of the ankylosaur specimen ZPAL MgD I/113. ZPAL MgD I/113 are known from a mostly complete tail, sacral, presacral vertebrae and a slab of armour from its back. ZPAL MgD I/113 have been referred to Tarchia, thought this is questionable, as its morphology differ from other specimens attributed to the genus.^[1]

Due to its incompleteness, the exact size of ZPAL MgD I/113 are difficult to determine: a restoration from 2014 lead to a body length of roughly 9 meters,^[2] while a 2017 study gave an estimation of 5.8-6.7 meters. ^[3] My size comparison of ZPAL MgD I/113 are based on the size of the “handle” part of its tail (depicted above the human figure), consisting of fused vertebrae (about 190 cm., based on fig. 7 from Arbour & Evans (2017),^[4] while the tail as a whole measures 3.101 meters).^[1] The rest of the body is a generalised guess, based on other ankylosaurids.

References

1. ↑ ^{a b} Arbour V.M. et.al. (2013). "An ankylosaurid dinosaur from Mongolia with in situ armour and keratinous scale impressions". Acta Palaeontologica Polonica 58(1): p. 55-64
2. ↑ Arbour V.M. et.al. (2014). "Epidermal and Dermal Integumentary Structures of Ankylosaurian Dinosaurs". Journal of Morphology 275(1): p. 39-50. [1]
3. ↑ Arbour V.M. & Mallon J.C. (2017). "Unusual cranial and postcranial anatomy in the archetypal ankylosaur Ankylosaurus magniventris". FACETS 2: 764–794. DOI:[2]
4. ↑ Arbour W.M. & Evans D.C. (2017). "A new ankylosaurine dinosaur from the Judith River Formation of Montana, USA, based on an exceptional skeleton with soft tissue preservation". Royal Society Open Science 4(5): [3]