Table 2. Main differences among the three species of Nanhsiungchelys.

Character	Nanhsiungchelys yangi	N. wuchingensis	Nanhsiungchelys sp. (SNHM 1558)
Snout	triangular (in dorsal view)	trumpet shaped	unknown
Premaxilla	higher than wide	wider than high in lateral view and has an inverse Y-shape in ventral view	unknown
Maxilla	unseen in dorsal views; a small portion of the maxilla extends posterior and ventral of the orbit	visible in dorsal views; the maxilla is located entirely anterior to the orbit	unknown
Jugal	higher than wide	wider than high	unknown
Prefrontal	convex dorsally behind the naris	concave behind the naris	unknown
Parietal	bigger than the frontal	smaller than the frontal	unknown
Mandible	the middle and posterior parts of the mandible are more robust than the most anterior part in ventral view	nearly all parts of the mandible are equal in width	unknown
Entoplastron	the angle between the two anterior edges of the entoplastron is wide (∼110°)	the angle between the two anterior edges of the entoplastron is only ∼100°	unknown
Anterolateral processes	wide	wide	slender
References	This article	Tong & Li (2019)	Hirayama et al. (2009)