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Wonderful paper here. Very in-depth discussion and description (more than in Yun 2017). However, it might be worth noting that "Teihivenator" is a nomen nudum as of yet since no Zoobank registry was made and it appears the paper does not publish paper copies (Marjanovic DML 2017).
It also appears as though you have not specifically designated a lectotype of "Teihivenator", which would probably be needed for future work. You imply that the tibia is the lectotype, but without specific mention, someone could decide that the ornithomimosaurian material is more distinct and could use the name "Teihivenator" for diagnosable ornithomimosaurian material (All of course considering that the name Teihivenator gets validly published).
Hi again Chase. I recently discovered that Yun (2017) copied some of my commentary on macropus from The Theropod Database without attribution in his paper- http://theropoddatabase.blogspot.com/2017/07/theropod-database-pilfered-again.html . I saw the specimens back in 2009 at the AMNH and have very high resolution photos (see example on that blog page and right click 'view image' and magnify) if you wish to use them in this publication, assuming your figures weren't just resized to be lower res for preprint purposes.
The statement in the abstract "This landmass, isolated from the western landmass Laramidia by a great inland sea known as the Western Interior Seaway, may have been a safe haven for dinosaur species which would be replaced on Appalachia’s western contemporary" is outdated because Farke and Phillips (2017) record a tooth from the Maastrichtian-age Owl Creek Formation of Mississippi. Therefore, it is clear that dinosaur clades that flourished in Laramidia during the latest Cretaceous migrated to Appalachia.
Farke AA, Phillips GE. (2017) The first reported ceratopsid dinosaur from eastern North America (Owl Creek Formation, Upper Cretaceous, Mississippi, USA) PeerJ 5:e3342 https://doi.org/10.7717/peerj.3342
I know you mentioned ornithomimosaur pedal phalanges from the Atlantic Coastal Plain that are more robust than AMNH 2551, 2552, and 2553, but Tsogtbaatar et al. (2018) note that recently discovered ornithomimosaur mani from the Nemegt Formation highlights a much higher ornithomimosaur diversity in the Nemegt, meaning that several ornithomimid mani from the Nemegt belong to taxa distinct from Anserimimus and Gallimimus. Therefore, since the Tsogtbaatar et al. paper offers another reason to suspect the presence of more than one ornithomimosaur in the Navesink, and if further study confirms that multiple ornithomimosaur species occur in the Navesink, it may be necessary to make the tibia AMNH 2550 the lectotype of Teihivenator macropus because macropus was originally described as a species of Dryptosaurus, it is unclear if AMNH 2551 belongs to Coelosaurus or another species due to its lack of overlap with ANSP 9222, and AMNH 2552 and 2553 are indeterminate beyond Tyrannoraptora.
Tsogtbaatar Chinzorig; Yoshitsugu Kobayashi; Khishigjav Tsogtbaatar; Philip J. Currie; Ryuji Takasaki; Tomonori Tanaka; Masaya Iijima; Rinchen Barsbold (2018). Ornithomimosaurs from the Nemegt Formation of Mongolia: manus morphological variation and diversity. Palaeogeography, Palaeoclimatology, Palaeoecology. in press. doi:10.1016/j.palaeo.2017.10.031.
Given that the Teihivenator syntype AMNH 2550 is recovered as a relative of Bistahieversor by Brownstein (in press), I think you might want to discuss how AMNH 2550 compares to Bistahieversor because this phylogenetic hypothesis would bolster the hypothesis that a number of tyrannosaurs from Laramidia immigrated to Appalachia as the Western Interior Seaway regressed during the terminal Cretaceous, and because an unnamed theropod from the Turonian Moreno Hill formation of New Mexico is reported as a basal tyrannosauroid by McDonald et al. (2010).
Chase D. Brownstein, in press. A tyrannosauroid tibia from the Navesink Formation of New Jersey and its biogeographic and evolutionary implications for North American tyrannosauroids. Cretaceous Research (advance online publication)
McDonald, Wolfe and Kirkland, 2010. A new basal hadrosauroid (Dinosauria: Ornithopoda) from the Turonian of New Mexico. Journal of Vertebrate Paleontology. 30(3), 799-812.