. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 120 R. P. CROLL ET Figure 3. Aldehyde-induced fluorescence in pediveligers of Plaatpecten magellanicus and Mwiliis editlis. (A) A number of fluorescent cells in the foot of a 36-day-old P. maxellanicim pediveliger possess processes (arrow) that extend from subepithelial somata to the ventral surface of the foot. (B) At least some of these processes appear to bear long cilia (arrows). (C) A 36-day-old pediveliger of P. magellanicus with gills. Larger arrows indicate three cells in the velum, three cells in the mantle, an
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. 120 R. P. CROLL ET Figure 3. Aldehyde-induced fluorescence in pediveligers of Plaatpecten magellanicus and Mwiliis editlis. (A) A number of fluorescent cells in the foot of a 36-day-old P. maxellanicim pediveliger possess processes (arrow) that extend from subepithelial somata to the ventral surface of the foot. (B) At least some of these processes appear to bear long cilia (arrows). (C) A 36-day-old pediveliger of P. magellanicus with gills. Larger arrows indicate three cells in the velum, three cells in the mantle, and numerous cells in the foot. Smaller arrows indicate fluorescent fibers projecting to the pedal ganglia (not in focus). (D) Fluorescent somata (larger arrows) and fibers (smaller arrows) along the rim of the velum of a 31-day-old pediveliger of M. eilulis. (E) A 34-day-old veliger of M. edulis with a prominent eyespot (eye). Larger arrows indicate cells in two gills. Smaller arrows indicate fluorescent fibers connecting gills with abdominal ganglia (abdom. g.). Calibration bars equal about 21 fim in A and B. 38 fjm in C. about 30 ^m in D, and about 17 pm in E. from cells in the developing pedal ganglia. Varicose fibers innervating the mantle appeared to originate from the abdominal ganglia (Fig. 5F). Discussion The distribution of fluorescent cells described in this report is consistent with both chromatographic evidence (Coon and Bonar, 1986) indicating the presence of cate- cholamines in bivalve larvae and evidence from other stud- ies suggesting major roles for catecholamines in such im- portant functions as locomotion, feeding, and the triggering of settling behavior and metamorphosis (Bonar et ai. 1990; Beiras and Widdows, 1995a, b). However, although the presence of some catecholamine-containing cells may have been expected, the locations and relatively large numbers of neurons described in this study are surprising in light of the commonly held belief that the nervous s
Size: 2322px × 1076px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
