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American Zoologist 1981 21(2):345-357; doi:10.1093/icb/21.2.345
© 1981 by The Society for Integrative and Comparative Biology
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Cellular Organization of the Testis and Spermatogenesis in Fishes1

HARRY J. GRIER
Department of Biology, University of South Florida Tampa, Florida 33620

SYNOPSIS. Tubular structure of the teleost testis can be divided into two basic types distinguished from each other by the distribution of spermatogonia. In most teleosts, spermatogonia occur along the length of the tubules, but in atheriniform fishes they are confined to the terminus of the tubule. Variations in these testis-types are discussed particularly in light of modifications leading to the production of spermatozeugmata or spermatophores.

Teleost boundary cells are located immediately outside of the tubule basement membrane. Previous reports homologizing "lobule boundary cells" with Leydig or Sertoli cells are in error. Leydig cells have been described for species of teleosts wherein they have previously been thought to be absent and are a typical component of the interstitium.

Sperm morphology reflects mode of reproduction. Nuclear elongation, coupled with possible elongation of the sperm midpiece, is characteristic of most species wherein fertilization is internal. Teleost sperm lack an acrosome.


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