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Fig. 4. Three-dimensional kinematic model of the buccal mass during a biting cycle.
The I1/I3 muscles are shown as a continuous blue mesh, the odontophore is
shown as a continuous yellow mesh, and the radular stalk is shown as a red
solid. Views are shown in orthographic projection. (A) Right lateral views of
transition, protraction and retraction. The central panel shows a side view of
protraction; the arrows to the left indicate the contact between the posterior
I3 muscle and the posterior of the radula/odontophore. The arrow to the right
indicates a gap between the dorsal surface of the odontophore and the dorsal
portion of the anterior I3 muscle; compare the views shown in
Fig. 12D,E. (B) Dorso-ventral
views of transition, protraction and retraction. The lateral groove
(posteriormost edge of the I1/I3/jaw complex) has been rotated so that it is
vertical. (C) Antero-posterior views of transition, protraction and
retraction. The left, middle and right columns are based on frames 26, 34 and
39, respectively, of bite 3213. Compare with
fig. 11 of Neustadter et al.
(Neustadter et al.,
2002b).
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