Abstract
Histological examination showed that the deep-sea amphipod Eurythenes gryllus possesses a unique tissue area around the afferent blood vessel of the gill, which exhibits well-developed infoldings of the basolateral cell membrane with many mitochondria. The location (i.e., around the afferent blood vessel) and the above ultrastructural characteristics indicate that this unique tissue is homologous with a type of osmoregulatory tissue which was described for the patchlike area of gills in two estuarine amphipods Grandidierella japonica and Melita setiflagella. We review the presence/absence of this specialized tissue for 12 species (including the above 3 species) belonging to 8 genera collected from deep-sea, coastal, brackish, supralittoral, and fresh-water areas. All but Sternomoera japonica, the distribution of which is limited to fresh-water seepage flows in forests, possessed the tissue. The discovery of the specialized tissue in E. gryllus confirms the widespread occurrence of the tissue in amphipod species.
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