ABSTRACT
Accounts of chondrichthyan sperm ultrastructure are often fragmentary. They are not, therefore, separately reviewed for individual species. A combined account for Holocephali and Elasmobranchii is given below. It is chiefly drawn from accounts of the well-described sperm of two species, the holocephalan Hydrolagus colliei (Stanley 1983) and the elasmobranch Squalus suckleyi (Stanley 1971) and a study, in this chapter, of Chiloscyllium punctatum (Brown-banded Catshark), Oasyatis fluviorum (Estuary Stingray) and D. kuhlii (Blue-spotted Stingray), augmented from an analysis of six characters in 35 species by Tanaka et al. (1995). It is preceded by a brief account of spermiogenesis (see also Chapters 4 and 6 of this volume).
