Abstract
The sperm of species of Geryon are typical of brachyurans in having a complex acrosome, a membranous lamellar complex, uncondensed chromatin in the nucleus, and nuclear arms or spikes of varying lengths. There are no microtubular elements in the arms. The spermatophores are ellipsoidal or round and contain varying numbers of sperm. The wall of each spermatophore is two-layered and fairly impermeable to fixatives. Globules of seminal fluid surround the spermatophores in the vasa deferentia. The golden crab Geryonfenneri Manning and Holthuis, 1984, is a nonswimming brachyuran from deep water in the eastern Gulf of Mexico. Relatively little is known about the reproductive biology of the golden crab or a related species, the red crab G. quinquedens Smith, 1879. The golden crab is a recently described species (Manning and Holthuis, 1984) and supports a newly established commercial fishery. Though many studies have been made of the sperm of other brachyurans, no ultrastructural studies have been made of the sperm of the genus Geryon. In this study, the morphological structure of the sperm of G. fenneri and G. quinquedens is examined and compared with that of other crustaceans.
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