Journal of Marine Sciences / 2013 / Article / Fig 1

Research Article

Role of the Digestive Gland in Ink Production in Four Species of Sea Hares: An Ultrastructural Comparison

Figure 1

Digestive glands of Aplysia juliana ((a), (b)), Aplysia parvula (d), and Dolabrifera dolabrifera ((c), (e)–(h)). ((a) and (b)) Rhodoplast cell with mainly empty digestive vacuoles and adjacent medium osmophilic granules and large electron-dense granule (compare with [16] Figure 7(a, c)). (c) Rhodoplast digestive vacuole with phycobilisome sized particles (compare with [16] Figure 4(d)). (d) Rhodoplast cell with full digestive vacuoles. (e) Rhodoplast cells with adjacent calcium carbonate granules and (f) a portion of a calcium carbonate cell showing the location of the nucleus. (g) Mature and immature calcium cells with adjacent rhodoplast cells and (h) the whorled appearance of rhodoplasts in rhodoplast cell digestive vacuoles (compare with [16] Figure 4(b, d)) adjacent to a calcium carbonate deposit. cc: calcium cell; cg: calcium carbonate granule; cv: calcium vacuole; pb: phycobilisome; rp: rhodoplast; rpc: rhodoplast cell; rpv: rhodoplast vacuole; s: starch. Scale bars: (a), (d), (f), and (h) = 2 μm; (b) = 4 μm; (c) = 0.2 μm; (e) and (g) = 5 μm.
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