{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,25]],"date-time":"2026-03-25T19:41:42Z","timestamp":1774467702758,"version":"3.50.1"},"reference-count":17,"publisher":"FapUNIFESP (SciELO)","issue":"4b","content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Braz. J. Biol."],"published-print":{"date-parts":[[2002,11]]},"abstract":"<jats:p>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 (~ 1.2 mum long and 1.8 mum wide) containing several mitochondria surrounding two centrioles and forming a mitochondrial collar. They have two flagella (each ~15 mum long) each of which has a common 9 + 2 microtubular pattern. Each flagellum has two opposite lateral cytoplasmic extensions that begin about 3 mum the midpiece still close to the end piece of flagellum.<\/jats:p>","DOI":"10.1590\/s1519-69842002000500014","type":"journal-article","created":{"date-parts":[[2005,4,18]],"date-time":"2005-04-18T11:05:50Z","timestamp":1113822350000},"page":"847-852","source":"Crossref","is-referenced-by-count":16,"title":["Biflagellate spermatozoon structure of the hermaphrodite fish Satanoperca jurupari (Heckel, 1840) (Teleostei, Cichlidae) from the Amazon River"],"prefix":"10.1590","volume":"62","author":[{"given":"E.","family":"MATOS","sequence":"first","affiliation":[{"name":"Faculdade de Ci\u00eancias Agr\u00e1rias do Par\u00e1,  Brazil"}]},{"given":"M. N. S.","family":"SANTOS","sequence":"additional","affiliation":[{"name":"Universidade Federal do Par\u00e1,  Brazil"}]},{"given":"C.","family":"AZEVEDO","sequence":"additional","affiliation":[{"name":"University of Oporto"}]}],"member":"530","reference":[{"key":"ref1","series-title":"The biology of the sperm cell","first-page":"1","author":"BACCETTI B.","year":"1976"},{"key":"ref2","doi-asserted-by":"crossref","first-page":"373","DOI":"10.1002\/mrd.1120100405","article-title":"Fish germinal cells: I. 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Pathol."},{"key":"ref6","doi-asserted-by":"crossref","first-page":"21","DOI":"10.2307\/1351292","article-title":"Gonads, spermatic ducts, and spermatogenesis in the reproductive system of male toadfish, Opsanus tau","volume":"4","author":"HOFFMAN R. A.","year":"1963","journal-title":"Chesapeake Sc."},{"key":"ref7","series-title":"Fish evolution and systematics: evidence from spermatozoa","first-page":"319","author":"JAMIESON B. G. M.","year":"1991"},{"key":"ref8","first-page":"67","article-title":"Ultrastructural study of the spermatogenesis of Lepidosiren paradoxa (Pisces, Dipnoi) in Amazon region","volume":"6","author":"MATOS E.","year":"1989","journal-title":"Rev. Bras. Ci\u00ean. Morfo"},{"key":"ref9","doi-asserted-by":"crossref","first-page":"223","DOI":"10.1016\/S0022-5320(84)90120-5","article-title":"Spermatozoides biflagell\u00e9s chez un poisson t\u00e9l\u00e9ost\u00e9en de la famille des Apogonides","volume":"88","author":"MATTEI C.","year":"1984","journal-title":"J. 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(Maldanidae), with definition of sperm types in relation to reproductive biology","volume":"19","author":"ROUSE G. W.","year":"1987","journal-title":"J. Submicrosc. Cytol."},{"key":"ref14","first-page":"477","article-title":"Electron microscopic observations on the biflagellate spermatids the teleost fish Porichtys notatus","volume":"151","author":"STANLEY H. P.","year":"1965","journal-title":"Anat. Rec."},{"key":"ref15","first-page":"305","author":"STOSS J.","year":"1983"},{"key":"ref16","doi-asserted-by":"crossref","first-page":"58","DOI":"10.1002\/mrd.1080420108","article-title":"Ultrastructure of the spermatozoa and eggs of the ocean Pout (Macrozoarces americanus L.), an internally fertilizing marine fish","volume":"42","author":"YAO Z.","year":"1995","journal-title":"Molecular Reproduction and Develop."},{"key":"ref17","first-page":"343","article-title":"Electron microscope study of the fish spermiogenesis","volume":"22","author":"YASUZUMY F.","year":"1971","journal-title":"J. Nara Med. Ass."}],"container-title":["Brazilian Journal of Biology"],"original-title":[],"link":[{"URL":"http:\/\/www.scielo.br\/pdf\/bjb\/v62n4b\/a14v624b.pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2017,5,24]],"date-time":"2017-05-24T22:36:55Z","timestamp":1495665415000},"score":1,"resource":{"primary":{"URL":"http:\/\/www.scielo.br\/scielo.php?script=sci_arttext&pid=S1519-69842002000500014&lng=en&tlng=en"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2002,11]]},"references-count":17,"journal-issue":{"issue":"4b","published-print":{"date-parts":[[2002,11]]}},"alternative-id":["S1519-69842002000500014"],"URL":"https:\/\/doi.org\/10.1590\/s1519-69842002000500014","relation":{},"ISSN":["1519-6984"],"issn-type":[{"value":"1519-6984","type":"electronic"}],"subject":[],"published":{"date-parts":[[2002,11]]}}}