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The ultrastructural features of the sperm were studied in the hermaphroditic teleost Satanoperca jurupari HECKEL, 1840 from Amazon River. Spermatocytes, spermatids and sperm develop in the testicular cysts among the different oocyte stages. Different stages of early spermatocyte development, mainly the ones with synaptonemal complexes were often observed. The mature spermatozoa belong to the introsperm type, with a short head (~ 3 mm long and 1.3 mum wide) without acrosome, short midpiece (~doi:10.1590/s1519-69842002000500014 pmid:12659036 fatcat:7ue3dxb2c5cxbnld7v6b5pfbpm