Abstract
AbstractThe ultrastructure of the spermatozoon of Ascidia nigra is described. The head of this sperm contains an elongated nucleus flanked and surrounded by a single large mitochondrion. No other mitochondria are present. An acrosome is seen to extend over a large portion of the nucleus. The tail shows the typical 9 + 2 arrangement of fibrils, and in some region carries fins.
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