|
| |
|
|
|
|
||||
| Home Help Feedback Subscriptions Archive Search Table of Contents | ||||
|
Fig. 10. Movements of the radular stalk relative to the odontophore during biting
versus swallowing. (A-D) Averaged rotation (A) and translation (C) of
the radular stalk (black lines are for biting, gray lines for swallowing).
Measurements were made of the rotation of the radular stalk relative to the
anterior border of muscle I6 (in B, the line of the radular stalk is
highlighted with a black line, and the anterior border of muscle I6 is
highlighted with a gray line), and the translation of the base of the radular
stalk relative to the dorso-ventral height of the odontophore (in D, the
distance from the base of the radular stalk to the base of the odontophore is
highlighted with a black line). In C, the horizontal gray line indicates when
the base of the radular stalk is exactly coincident with the base of the
odontophore. When the data lie above this line, the radular stalk has moved
towards the dorsal surface of the odontophore; when the data lie below this
line, the radula stalk is protruding ventrally out of the odontophore. Values
in A and C are means (solid lines) ± 1 s.d. (broken lines). (E,F) Model
outputs of the peak of swallowing (E, 7732, S3, frame 26) and the peak of
biting (F, 3213, S1, frame 34), to directly compare the positions of the
radular stalk near the peak of protraction. The outlines of the
radula/odontophore have been rotated so that the prow is straight, and lateral
views are shown. Note that the radular stalk is closer to the top of the
radula/odontophore at the peak protraction of biting (F) than at the peak
protraction of swallowing (E).
|
