. Die biologische Bulletin. Biologie; Zoologie; Biologie; Meeresbiologie. Abbildung 18. Licht photomicrograph eines live Searlesia dim frühen veliger in einer Lösung von FITC getränkt worden war - chromoendoskopie Eiklar für 3h. Abbildung 19. Epifluorescence photomicrograph des gleichen veliger in Abbildung 18 zu sehen, die die hellen aufnahmefähigen Zellen, die das Fluorescein-markiertem Protein akkumuliert. Maßstabsbalken stellt 100 ^m; ac. absorbierende Zelle; EG, ektoderm; f, Fuß; ne, schluckte Krankenschwester Eier; v, velum. Andere und die gleichen ultrastructures sie in 5 entwickeln. dim. Präsenz ofahsor/nive Zellen in di/fercnt Gastropode

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. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. Figure 18. Light photomicrograph of a live Searlesia dim early veliger that had been soaked in a solution of FITC-capsular albumen for 3 h. Figure 19. Epifluorescence photomicrograph of the same veliger seen in Figure 18, showing the bright absorptive cells that accumulated the fluorescein-labelled protein. Scale bar represents 100 ^m; ac. absorptive cell; ec, ectoderm; f, foot; ne, swallowed nurse eggs; v, velum. other and develop the same ultrastructures they do in 5. dim. Presence ofahsor/nive cells in di/fercnt gastropod spe- cies. Embryos and some larvae from the three gastropod subclasses were tested for the presence of larval kidney absorptive cells. The species examined normally hatch either as veligers or postmetamorphic juveniles. Embryos were removed from their capsules, rinsed in seawater and placed in an FITC-BSA solution for at least I h before being examined under UV epi-illumination. Posthatching veligers of several species were obtained from cultures for testing. In all seven prosobranch species tested that hatch as veligers, paired absorptive cells were found in prehatching stages (Table I). After hatching, veligers lost their absorp- tive cells within two or three days. Crystal cells were also detected in Oenopota levidensis veligers with polarized light. These cells were no longer detectable after the ab- sorptive cells were resorbed during the second to third day after hatching. Of the twelve prosobranch species tested that hatch as juveniles, only ten had embryos possessing paired ab- sorptive cells (Table I). In these species, the absorptive cells were resorbed or at least did not protrude from the embryos after intracapsular metamorphosis. Littorinu sitkanu and Petaloconchus moniereyensis embryos were the only prosobranchs that did not show absorptive cells at some stage. The capsules of L. silkana contain albumen, but those of P. nn >ntereyensis possess little or none a

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• booksubjectzoology
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• buchsubjektbiologie