. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. A. GARM AND J. T. H0EG BCD. t= Figure 8. Rotation of a small particle (P) in a medial plan by the bases of maxilla 1 and maxilla 2 (Mxl bas, dark gray and Mx2 bas, light gray). View is ventro-anterior. Only left side is shown in B-G, and setae are shown only when in contact with P. Right and left side move in synchrony and in phase. Arrows indicate direction of movements. Dotted line indicates hidden structure. Mx2 basis makes circular movements; black dots indicate the positions of the appendages in the circle. (A. B) M
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. A. GARM AND J. T. H0EG BCD. t= Figure 8. Rotation of a small particle (P) in a medial plan by the bases of maxilla 1 and maxilla 2 (Mxl bas, dark gray and Mx2 bas, light gray). View is ventro-anterior. Only left side is shown in B-G, and setae are shown only when in contact with P. Right and left side move in synchrony and in phase. Arrows indicate direction of movements. Dotted line indicates hidden structure. Mx2 basis makes circular movements; black dots indicate the positions of the appendages in the circle. (A. B) MX 1 basis releases P. (C) Mx2 basis hits anterior edge of P from dorso-anterior, pushing it ventro-posteriorly. (D-F) Mxl basis hits posterior edge of P from ventro-posterior, pushing it dorso-anteriorly. Mx2 basis releases P. (G) Mx2 basis moves laterally and up; Mxl basis releases P. Process is ready to start again. Inc = incisorprocess, Mdp = mandibular palp, t = time in seconds (specific for series of pictures, not generalized). posterior direction and push it dorso-anteriorly. When cir- cling in the opposite direction, the Mx2 bases hit the particle from a dorso-anterior direction and push it ventro-posteri- orly. This causes the particle to be rotated around a point between the bases of Mxl and Mx2. In both cases, the Mxl bases are responsible for most of the rotation, and the animal has serrate and cuspidate setae in contact with the particle at all times. The Mxpl bases tend to make circular movements that push the particle toward the MX2 basis. Both during sediment sorting and when rotating a small particle, the Mxl, Mx2, and Mxpl bases normally circle with the same frequency. The normal order of contact with the particle is Mxl basis, Mx2 basis, Mxpl basis, Mxl basis, and so forth in a repeated way, as seen in Figure 6. However, the Mxpl bases occasionally per- form more complex movement patterns independent of the positions of the Mxl and Mx2 bases, as indicated in F
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
