. The Biological bulletin. Biology; Zoology; Marine biology. THE EYE OF RIMICARIS SP. (CRUSTACEA) 105. Figure 6. Electron micrographs of the retina. (A) Lobulated nucleus (wn) surrounded by the vesicle- laden cytoplasm of white diffusing cells (w). The adjacent photoreceptor rhabdomeral segment contains an aggregate of lipid droplets (Id) and rhabdom (r). (B) Photoreceptor nucleus (pn) is surrounded by a very thin band of cytoplasm and processes of white diffusing cells. The screening pigment granules at lower right are in the axon of another photoreceptor. (C) Higher magnification micrograph
. The Biological bulletin. Biology; Zoology; Marine biology. THE EYE OF RIMICARIS SP. (CRUSTACEA) 105. Figure 6. Electron micrographs of the retina. (A) Lobulated nucleus (wn) surrounded by the vesicle- laden cytoplasm of white diffusing cells (w). The adjacent photoreceptor rhabdomeral segment contains an aggregate of lipid droplets (Id) and rhabdom (r). (B) Photoreceptor nucleus (pn) is surrounded by a very thin band of cytoplasm and processes of white diffusing cells. The screening pigment granules at lower right are in the axon of another photoreceptor. (C) Higher magnification micrograph of the limited photoreceptor cytoplasm (pc) surrounding the nucleus (pn). Disrupted mitochondria (m) are present. The vesicles of the white diffusing cells (w) are adjacent to the photoreceptor cytoplasm. The scale bar in (C) represents jim in (A), Mm in (B), and /xm in (C). No structures typically associated with membrane shed- ding, such as lamellar bodies or multivesicular bodies, are found anywhere in the photoreceptor cytoplasm, nor are they found in the surrounding white diifusing cells. The white diffusing cells have a complex shape with many long, thin branches. Sections show many small profiles with round vesicles in lucent cytoplasm. The white cell nucleus is prominently lobulated with distinct ag- glomerations of chromatin (Fig. 6A). Screening pigment cells are elliptical with cytoplasm replete with pigment granules and lobulated nuclei with aggregated chromatin. Summary Figure 7 is a summary drawing of the anatomy of the large dorsal eye of the bresiliid shrimp, Rimicaris sp. The paired wings are connected anteriorly by a thin strand that crosses the midline (Fig. 7B). The wings themselves have both a dorsal and lateral portion (Fig. 7C). The retina underlies a smooth, transparent cornea devoid of any dioptrics. The massive array of photosensitive membrane in the mosaic of photoreceptor R-segments sits on top of a layer of white diffusing cells that p
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Keywords: ., bookcentury1800, bookdecade1890, booksubjectb, booksubjectzoology
