. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 118 R. P. CROLL ET Figure 1. Wholemounted. 22-day-old Placopecten iiiuxt'lliiinciis veliger viewed at two focal planes. (A) The partially retracted velum is to the right, and the digestive gland (digest, , which exhibits red autofluorescence. lies toward the left, near the valve hinge. Aldehyde-induced, blue-green fluorescence is localized to two cells (arrows) and interconnecting fibers along the outer rim of the velum. (B) Single, blue-green fluorescent, flask-shaped cells (arrows) are also located on each side of
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 118 R. P. CROLL ET Figure 1. Wholemounted. 22-day-old Placopecten iiiuxt'lliiinciis veliger viewed at two focal planes. (A) The partially retracted velum is to the right, and the digestive gland (digest, , which exhibits red autofluorescence. lies toward the left, near the valve hinge. Aldehyde-induced, blue-green fluorescence is localized to two cells (arrows) and interconnecting fibers along the outer rim of the velum. (B) Single, blue-green fluorescent, flask-shaped cells (arrows) are also located on each side of the mouth. Velar retraction has displaced one of the cells slightly ventrally in this figure. The faint outlines of valve adductor muscles (adduct. muse.) and velar retractor muscle (retract, muse.) can also be seen. Calibration bars in A and B equal about 23 i^m. dorsolaterally from each of these cell bodies, and thin fibers running across the midline immediately ventral to the mouth interconnected the two somata. Generally, an- other single fiber could be seen running between the mouth region and an area directly behind the apical tuft at the very center of the velum (Fig. 2A; see Raineri, 1995). By 36 days of age, the larvae of P. magellaniciis (about 275 /jm shell length) possessed prominent feet and occa- sionally one or two gills. The general pattern of staining in the vela of these pediveligers was essentially the same as that seen in 22-day-old larvae, although the vela were smaller in such specimens (Fig. 3C). The foot of each pediveliger contained 15-20 fluorescent cells located pre- dominantly toward the tip and along the ventral side (sole) of the appendage (Fig. 3A-C). Distal processes from the subepithelial somata of at least some of these cells ap- peared to bear long cilia that projected from the surface of the foot (Fig. 3B). Axons from the fluorescent cells of the foot appeared to project centrally and converge upon the developing pedal ganglia (Fig 3C), alth
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
