Sperm of Doradidae (Teleostei: Siluriformes)

Made available in DSpace on 2013-09-27T14:54:34Z (GMT). No. of bitstreams: 1 WOS000288637500002.pdf: 4001569 bytes, checksum: e51767abb616d45441648163a1275fea (MD5) Previous issue date: 2011-02-01 Made available in DSpace on 2013-09-30T18:39:54Z (GMT). No. of bitstreams: 1 WOS000288637500002.pdf: 4001569 bytes, checksum: e51767abb616d45441648163a1275fea (MD5) Previous issue date: 2011-02-01 Submitted by Vitor Silverio Rodrigues (vitorsrodrigues@reitoria.unesp.br) on 2014-05-20T13:52:32Z No. of bitstreams: 1 WOS000288637500002.pdf: 4001569 bytes, checksum: e51767abb616d45441648163a1275fea (MD5) Made available in DSpace on 2014-05-20T13:52:32Z (GMT). No. of bitstreams: 1 WOS000288637500002.pdf: 4001569 bytes, checksum: e51767abb616d45441648163a1275fea (MD5) Previous issue date: 2011-02-01 Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) Spermatic characteristics were studied in 10 species representing several distinct groups within the catfish family Doradidae. Interestingly, different types of spermatogenesis, spermiogenesis and spermatozoa are correlated with intrafamilial groups previously proposed for Doradidae. Semi-cystic spermatogenesis, modified Type Ill spermiogenesis, and biflagellate sperm appear to be unique within Doradidae to the subfamily Astrodoradinae. Other doradid species have sperm with a single flagellum, cystic spermatogenesis, and spermiogenesis of Type I (Pterodoras granulosus, Rhinodoras dorbignyi), Type I modified (Oxydoras kneri), or Type III (Trachydoras paraguayensis). Doradids have an external mode of fertilization, and share a few spermatic characteristics, such as cystic spermatogenesis, Type I spermiogenesis and uniflagellate sperm, with its sister group Auchenipteridae, a family exhibiting sperm modifications associated with insemination and internal fertilization. Semi-cystic spermatogenesis and biflagellate spermatozoa are also found in Aspredinidae, and corroborate recent proposals that Aspredinidae and Doradoidea (Doradidae + Auchenipteridae) are sister groups and that Astrodoradinae occupies a basal position within Doradidae. The co-occurrence in various catfish families of semi-cystic spermatogenesis and either biflagellate spermatozoa (Aspredinidae, Cetopsidae, Doradidae, Malapturidae, Nematogenyidae) or uniflagellate sperm with two axonemes (Ariidae) reinforces the suggestion that such characteristics are correlated. Semi-cystic spermatogenesis and biflagellate sperm may represent ancestral conditions for Loricarioidei and Siluroidei of Siluriformes as they occur in putatively basal members of each suborder, Nematogenyidae and Cetopsidae, respectively. However, if semi-cystic spermatogenesis and biflagellate sperm are ancestral for Siluriformes, cystic spermatogenesis and uniflagellate sperm have arisen independently in multiple lineages including Diplomystidae, sister group to Siluroidei. (C) 2010 Elsevier Ltd. All rights reserved. Univ Estadual Paulista, Dept Morfol, Inst Biociencias, BR-18618970 São Paulo, Brazil UNESP, Inst Biociencias Botucatu, Grad Program Zool, Botucatu, SP, Brazil Acad Nat Sci Philadelphia, Dept Ichthyol, Philadelphia, PA 19103 USA Univ Estadual Paulista, Dept Morfol, Inst Biociencias, BR-18618970 São Paulo, Brazil UNESP, Inst Biociencias Botucatu, Grad Program Zool, Botucatu, SP, Brazil