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The general sperm structure of the investigated clupeoids possess an oliviform head with a distinct deep nuclear fossa, a midpiece with one mitochondrion and a posterior flagellum. They are characterized by two apomorphies: an annular or C-shaped mitochondrion and ITDs (intratubular differentiation) in the A tubules of the axonemal doublets. The fine structure of the spermatozoa of blue sprat, Spratelloides...
The mature spermatozoa of two Taiwan protandrous hermaphrodite Sparidae Acanthopagrus berda and Acanthopagrus australis are investigated and compared with those of other two Sparidae (Lagodon rhomboids and Archosargus probatocephus) from the Western hemisphere. Ultrastructurally the spermatozoon of these four species has a spherical, homogeneously electron-dense nucleus with an axial nuclear fossa...
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