. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 118 S. M. BAKER ET AL the inhalent siphon, any movement of the OIT resulted in the cessation of feeding. And when the pallial cavity was entered through the pedal gape, the foot usually touched the OIT, coating it with mucus. Results were based on the examination of 21 mussels. Particle velocities on feeding structures were determined from the number of video frames required for a particle to traverse a known distance. Distances were calibrated ac- cording to Ward (1996): the pallial organs were dis- sected from severa
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 118 S. M. BAKER ET AL the inhalent siphon, any movement of the OIT resulted in the cessation of feeding. And when the pallial cavity was entered through the pedal gape, the foot usually touched the OIT, coating it with mucus. Results were based on the examination of 21 mussels. Particle velocities on feeding structures were determined from the number of video frames required for a particle to traverse a known distance. Distances were calibrated ac- cording to Ward (1996): the pallial organs were dis- sected from several mussels, and the widths of the ctenidial filaments, palp ridges, and marginal grooves were measured with a compound microscope equipped with a calibrated Ant iPL ocular micrometer. Velocities means ± 1 standard deviation. Results s~') are presented as When observed by endoscopy, the positions of the ctenidia within the pallial cavity are different from those that might be expected from dissected specimens (Fig. 1). The demibranchs are held curved towards the visceral mass, and the ventral margin of the outer demibranchs is partic- ularly bent inward (Fig. 2). These gill postures are main- tained despite variation in the overall orientation of the mussels. Through the relatively transparent ciliated epithelia of the ctenidia. we observed internal bands of muscular cross- struts (Medler and Silverman, 1997) that are perpendicular to the ctenidial filaments and 60-80 /xm apart. Ostia, lo- cated in the epithelium of the interfilamentary spaces, are lacking directly above the struts (Medler and Silverman. 1997). The inhalent flow of suspended particles sometimes stops, or even reverses momentarily, especially under high particle concentrations. In addition, the ctenidia often con- tract during active feeding; the interfilamentary spaces. where the ostia are located, alternately flare and close at a rate of 1 cycle s '. The extension of the mantle and siphons. often used as an ind
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
