Figure 16. Jaw joint of polyodontids and representatives of three genera of Acipenseridae: The jaw joint is shown with anterior facing left.
The interhyal (ih) contacts the palatoquadrate (pq) in all extant acipenseriformes except Huso (c; Character 26) where contacting exten-
sions of the interhyal (ihpa, heavy arrows) and palatoquadrate are not present. The joint with the posterior ceratohyal (chp) is anterior in
Husoand polyodontids (arrows to left in a, b, c), but displaced posteriorly in acipenserines (arrows pointing right in d, e; Character 36).
h= hyomandibula,mk= Meckel’s cartilage.
martin jones
(Martin Jones)
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