51813_Sturgeon biodioversity an.PDF

Figure 3.Jugal of representatives of all genera of Acipenseridae: The jugal defines the posteroventral margin of the orbit (top in black).
Illustrations include lateral and ventral views for each genus. The anterior process of the jugal (atp, Character 3) extends anterolaterally
beneath the orbit and lacks any portion of the infraorbital canal. The canal extends anteromedially within the canal process of the jugal
(cnp) before entering a series of tube bones in all acipenserids except Pseudoscaphirhynchus(Character57)(brb = border rostral bones).