Summary
The gill epithelium of the Neoceratodus forsteri contains ce0lls which produce generations of dark vesicles. These vesicles move in waves towards the surface of the cells, break the cellular membranes and pour their content onto the cellular surfaces. This surface coat consists of threads and granules. The breaking of cell membranes by the densely situated vesicles leads to formation of processes, which join frequently to form a surface net: conversely the cytoplasm of the epithelial cells forms large invaginations penetrated by fluid. The reduction of cytoplasm and the mechanical loss of the cytoplasmic processes leads finally to the destruction of the cell.
A small number of granulated cells with long processes extending between other cells have also been observed. The border between the gill epithelium and the connective tissue is characterised by the presence of bundles of thin fibers penetrating the epithelium.
The above findings are discussed in relation to the differentiation of the epithelial cells, the facilitation of respiration in poorly oxygenated waters, the protection of gill surfaces against abrasion and with regard to the survival of the lung fish in different conditions.
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Tucker, R. Some functional and morphological adaptations in the gills of dipnoi. Z. Morph. Tiere 73, 279–296 (1972). https://doi.org/10.1007/BF00391924
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DOI: https://doi.org/10.1007/BF00391924