Lower premolar (p4) of <i>Arboroharamiya jenkinsi.</i>

<p>A, Lingual view of p4. B, Buccal view of p4. Abbreviations: <b>1–4</b>, cusps 1–4 on the heel of p4, ranging from the lingual to the buccal side of the tooth; <b>brd</b>, buccal ridge on the main cusp of p4; <b>lrd</b>, lingual ridge on the main cusp of p4. Note the lack of serrations on both sides of the tooth crown.