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Fig. 4. (A-F) Transmission electron micrographs of Carcinus maenas
epithelial gill cells in zoea IV(A), megalopa (B), juvenile crab I (C-E) and
adult (F). (A) Two epithelial cells of gill buds with central nuclei
surrounded by a few mitochondria. (B) Marginal tip of a posterior gill
filament in megalopal stage. The development of basolateral infoldings is
visible around the hemolymph lacuna, and numerous vesicles are located within
the cytoplasm of the epithelial cells. (C) Apical cell part of an ionocyte
with mitochondria in close contact to apical microvilli, note endocuticle
detached from epidermal layer. (D) High magnification of apical microvilli
showing a band desmosome connection (arrow) between two neighbouring cells.
(E) Basal cell part of an ionocyte with deep basolateral infoldings of the
cytoplasmic membrane. Numerous elongated mitochondria are visible in close
contact with basolateral infoldings. (F) Epithelial ionocyte of a posterior
gill filament with apical microvilli and numerous mitochondria in close
contact with basolateral infoldings of the cytoplasmic membrane. Vesicles are
noticeable at apical and basal cell poles. Bm, basal membrane; cu, cuticle;
hl, hemolymph lacuna; mi, mitochondrium; mv, microvilli; nu, nucleus; ve,
vesicle. Bars, 2 µm (A,B); 1 µm (C-F); 0.2 µm (D).
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