. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 9. A collage of videotape frames showing the capture of a 20 ^m diameter sphere by a bipinnaria (Dermasterias imbricala). Numbers and arrow as in Figure 5. For scale, the arrow is 89 ^m long. The larva is shown in ventral view, moving forward toward the top of each panel. The sphere approached the left anterior side of the larva ( s) and was swept directly into the larval mouth ( s) without close approach to any part of the ciliated band and without changing direction at the band. the mout
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 9. A collage of videotape frames showing the capture of a 20 ^m diameter sphere by a bipinnaria (Dermasterias imbricala). Numbers and arrow as in Figure 5. For scale, the arrow is 89 ^m long. The larva is shown in ventral view, moving forward toward the top of each panel. The sphere approached the left anterior side of the larva ( s) and was swept directly into the larval mouth ( s) without close approach to any part of the ciliated band and without changing direction at the band. the mouth) for both species. Spheres initially caught lateral to the mouth were captured fewer times before ingestion than were spheres caught either anterior, or posterior, to the mouth (comparison of mean capture numbers by analysis of variance and post hoc contrasts for Parasti- chopiis, ¥ = ; for Dermasterias, F = ; for both comparisons, P < ). Spheres caught initially on the anterior part of the ciliated band were also captured more times than those caught initially on the posterior end of the larva (for Parastichopus, F = , P < ; for Dermasterias, F = ; P = ). The mean (± one standard deviation) number of captures for all spheres was also greater for Parastichopus ( ± ) than for Dermasterias ( ± ) (compared by /-test, / = , P = ). These observations support the probable role of cilia on the circumoral field in trans- porting captured particles to the mouth. Spheres captured several hundred micrometers posterior to the mouth could be moved swiftly to the suboral pocket, in spite of the anterior direction of movement of the whole larva. In similar captures, larvae of Parastichopus, which lack cir- cumoral ciliation (Strathmann, 1971), retained captured spheres more often en route to the mouth (see above) than did asteroid larvae, whicrfjiave abundant circumoral cilia (Gemmill, 1914, 1916; Tattersall and Shepp
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
