Scales and Tooth Whorls of Ancient Fishes Challenge Distinction between External and Oral `Teeth' Qu, Qingming ; Sanchez, Sophie ; Blom, Henning ; Tafforeau, Paul ; Ahlberg, Per Erik Abstract Publication: PLoS ONE Pub Date: August 2013 DOI: 10.1371/journal.pone.0071890 Bibcode: 2013PLoSO...871890Q