. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ANNELID LARVAL FEEDING MECHANISMS 21. Figure 7. Videorecorded capture of a 40-fxm sphere by a Urechis caupo larva. Time is in seconds in the lower left-hand comer. The sphere is near the metatrochal cilia at the posterior lip of the mouth at 0 s and moves over this band of cilia toward the mouth at and s. It is just entering the mouth at s. The anterior end is toward the upper right. At 0 s the larva is 300-^im wide at the base of the prototrochal cilia. the mouth stopped beating as the particle moved post
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. ANNELID LARVAL FEEDING MECHANISMS 21. Figure 7. Videorecorded capture of a 40-fxm sphere by a Urechis caupo larva. Time is in seconds in the lower left-hand comer. The sphere is near the metatrochal cilia at the posterior lip of the mouth at 0 s and moves over this band of cilia toward the mouth at and s. It is just entering the mouth at s. The anterior end is toward the upper right. At 0 s the larva is 300-^im wide at the base of the prototrochal cilia. the mouth stopped beating as the particle moved posteriorly down the body (Fig. 3). Metatrochal cilia at the mouth of larvae of Urechis caupo must also have altered beat during particle rejection, because large particles moved posteriorly over the lower lip and down the neurotroch during rejection (Fig. 8). in contrast to their posterior-to-anterior path over the lip during ingestion (Fig. 7). For larvae ofArmandia h rev is. prototroch circumference and prototrochal eilium length increased with number of setigerous segments (Fig. 9A. B). Larval volume increased exponentially with number of setigers (Fig. 9C). Particle velocities increased slightly with number of se- tigers for larvae of A. hrevis with 6-7. 11-12. and 15-16 setigers (H = 9) (Fig. 10). Increased particle velocities and eilium lengths resulted in a 30% increase in the area of water per prototrochal slice moved per second between larvae with 6-7 and 11-12 setigers and a 22% increase between larvae with 11-12 and 15-16 setigers (Table III). Maximum particle velocities were within the distal third of the eilium length (estimated for each size class from Fig. 9B). consistent with our expectations (Emlet and Strath- mann. 1994). Although Strathmann et al. (1993) suggested that eilium lengths might be underestimated from videore- cordings, our results indicate that this was not the case. In addition, our measurements agree with the eilium length of approximately 35 /im r
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
