Abstract
Striated microfilament bundles attaching to the plasma membrane of cytoplasmic bridges between spermatogenic cells are described in the
black snail, Semisulcospira libertina. The bundles were occasionally observed in bridges connecting spermatogonia, spermatocytes and typical
spermatids. Relations between bundles and centrioles could not be detected. The bundle had electron dense cross bands with a periodicity of
approximately 200 nm, and attached to the membrane with almost right angle at the cross linker level. Phalloidin cytochemistry revealed that
the bundle contained F-actin. In a case, a bundle connected two cytoplasmic bridges.
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