User:Old Dead Fish/sandbox

'''Palaeodontidae is an extinct family of thelodont vertebrate agnathans that lived during the Lower Ordovician. The dermal denticles of these thelodonts lack a neck or base and form simple orthodentine cones. Obruchev, D. V. "Fundamentals of Paleontology. Vol. 11, Agnatha, Pisces. Israel Program for Scientific Translations, Jerusalem, 1967." (1967): 825.