. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. NERVOUS CONTROL OF CILIARY ACTIVITY IN GASTROPOD LARVAE 183. vl op f FIGURE 1. Veliger larva of Mangclia. Abbreviations are f, foot; m, mouth; op, operculum; po, postoral ciliated band; pr, preoral ciliated band; s, shell; t, tentacle; vl, lobe of velum; scale, 100 /*. system in bivalve gills, currently the subject of active investigation in several laboratories (see reviews by Aiello, 1974; Jeirgenson, 1975). MATERIALS AND METHODS Several species of veliger larvae, including both prosobranch and opisthobranch genera were in
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. NERVOUS CONTROL OF CILIARY ACTIVITY IN GASTROPOD LARVAE 183. vl op f FIGURE 1. Veliger larva of Mangclia. Abbreviations are f, foot; m, mouth; op, operculum; po, postoral ciliated band; pr, preoral ciliated band; s, shell; t, tentacle; vl, lobe of velum; scale, 100 /*. system in bivalve gills, currently the subject of active investigation in several laboratories (see reviews by Aiello, 1974; Jeirgenson, 1975). MATERIALS AND METHODS Several species of veliger larvae, including both prosobranch and opisthobranch genera were investigated in this study, but the reported observations refer to Mangelia nebula (Montagu) and to the Mangclia sp. termed species C (Thiriot- Quievreux, 1969), which were convenient to study, being larger and less prone to retract into their shells than most other prosobranch species. Polytroch larvae of the gymnosome pteropod Pneumoderma atlanticnm (Oken) were also investigated. These post-veliger larvae lack a velum, but have three ciliated rings, one at the base of the head, one in the middle of the body and a third near the posterior end (Fol, 1875). The ciliated bands persist long after the appearance of adult organs and continue to serve for locomotion even after the wings are developed. The larvae were retrieved from freshly collected plankton hauls in the bay of Villefranche-sur-Mer during the period January to May 1975. They were isolated in clean water and used for experiments within a day or two of collection. Fine polyethylene tubes were used as suction holders, doubling as electrodes for stimulating and recording. Tubes of about 30^ internal tip diameter were chiefly used. Attachment of these electrodes stimulates the animal initially and causes contraction and ciliary arrest, but if the suction applied is not excessive, specimens soon relax and resume normal activity. For intracellular recordings, glass micro- electrodes of 40-50 megOhms resistance were used in co
Size: 2084px × 1199px
Photo credit: © Library Book Collection / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
