Abstract
IN the closely related salmonoid genera Opisthoproctus and Monacoa the ventral surface is formed as a flat sole reaching from under the head to the terminal or subterminal anus. Trewavas1 found an organ immediately under the skin of the sole which she regarded as a swim-bladder. The question why these fishes, in contrast to all other known bathy-pelagic fish, should have a flat ventral surface and presumably swim upside down called for an explanation.
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References
Trewavas, E., Proc. Zool. Soc. Lond., 601 (1933).
Haneda, Y., Palao Trop. Biol. Sta., 2, 29 (1940); Pacif. Sci., 4, 214 (1950).
Harms, J. W., Z. Wise. Zool., 131, 157 (1928).
Kato, K., Zool. Mag. Tokyo, 57, 195 (1947).
Yasahi, Y., and Haneda, Y., Proc. Imp. Acad. Jap., 12 (2), 55 (1935).
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BERTELSEN, E. A New Type of Light Organ in the Deep-Sea Fish Opisthoproctus . Nature 181, 862–863 (1958). https://doi.org/10.1038/181862b0
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DOI: https://doi.org/10.1038/181862b0
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