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In decapods, spermatozoa are nonmotile, aflagellate cells that display an uncondensed nucleus and one or several appendages (re- ferred to as spikes or arms). The most dis- tinctive feature in the spermatozoa of brachyurans is the presence of multiple arms radiating from the sperm body and a con- spicuous acrosome (Brown, 1966; Pochon- Masson, 1968a; Hinsch, 1969, 1973, 1986, 1988; Reger, 1970; Jamieson, 1989a, b, 1991; Jamieson and Tudge, 1990; Felgen- hauer and Abele, 1991; Medina and Rod- riguez, 1992). Aside from light microscope descriptions of early researchers (Binford, 1913), detailed ultrastructural observations are available to understand the acrosome reaction and the way the sperm penetrate the egg investments (Brown, 1966; Pochon- Masson, 1968a; Hinsch, 1971; Goudeau, 1982). These previous accounts contributed substantially to understanding the processes of acrosome reaction and oocyte penetra- tion. However, the use of the transmission electron microscope (TEM) to investigate fertilization in brachyurans meets the dif- ficulty of the small sperm size (a few Am in diameter) in comparison to the large mature oocytes (a few hundred �m), so that the number of favorable sections is low. In con- trast, scanning electron microscope (SEM) samples allow the observation of numerous sperm at different
Journal of Crustacean Biology – Brill
Published: Jan 1, 1992
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