. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 82 E. E. LlCLAIR AND M. C. L<\BARBERA. Figure 5. Enlarged photonegative of oral arm surface. Ophiocoma ccliiniila Borders of adjacent oral arm plates were used to measure intersegmental angles (W). op = oral plate. Digitizing technique To quantify the degree of intersegmental rotation, more than 1300 photographic negatives were digitized using BioScan OPTIMAS software (ver. ). The por- tions of the arm with the sharpest lateral curvature were visually selected from each frame. In the locomotion ex- periments, the regio
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 82 E. E. LlCLAIR AND M. C. L<\BARBERA. Figure 5. Enlarged photonegative of oral arm surface. Ophiocoma ccliiniila Borders of adjacent oral arm plates were used to measure intersegmental angles (W). op = oral plate. Digitizing technique To quantify the degree of intersegmental rotation, more than 1300 photographic negatives were digitized using BioScan OPTIMAS software (ver. ). The por- tions of the arm with the sharpest lateral curvature were visually selected from each frame. In the locomotion ex- periments, the region of sharpest curvature was selected from each arm participating in the locomotory "; These regions were generally in the middle third of the arm. where the segments were sharply bent to push against the substrate. In the coiling experiments, the re- gion of sharpest curvature was selected from the proxi- mal or middle portion of each arm that appeared tightly coiled. In this treatment, there were often several tight bends per arm, and most (but not necessarily all) of the arms were involved in this form of bending. From each selected region, line segments were digi- tized along the proximal borders of 10 adjacent oral plates, and the angles between adjacent plates were cal- culated (Fig. 5). Oral plate borders were used as land- marks for comparing segment rotations because these boundaries appeared sharpest on the photographic nega- tives. Because the oral arm plates are not rigidly con- nected to the vertebral ossicle series, we use the term "in- tersegmental angles" to refer to these data. Although we did not visualize the vertebral series directly, in adjacent segments the oral intersegmental angle and the underly- ing intervertebral angle are probably quite similar, as both series of ossicles must follow essentially the same overall arm curvature. Even if oral arm plates are free to move independently of the vertebral series, the angle between a
Size: 1732px × 1443px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
