FIGURE 4 in Tooth enamel microstructure in North American Phytosauria (Diapsida:Archosauriformes): Implications for biogeography and ecology of a Late Triassic clade of crocodylian-like predators

FIGURE 4. SEM captures of Angistorhinus teeth from the Popo Agie Formation of Wyoming. 4A—NMMNH P-36190 type I tooth, transverse section across a denticle; 4B—NMMNH P-36190 type I tooth tangential view of enamel, polygonal columnar enamel packages evident on lower half of image; 4C—NMMNH P-36190 type I tooth enamel from labial margin of tooth; 4D—NMMNH P-36190 type I tooth enamel from lingual margin of tooth; 4E—NMMNH P-36192 type B tooth enamel preserves thin columnar packages; 4F—NMMNH P-36191 type B tooth with a few faint LIGs near OES. All scale bars equal 50 µm.