Sperm of Doradidae (Teleostei: Siluriformes)

Abstract 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-c...

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Bibliographic Details
Published in:Tissue & cell 2011-02, Vol.43 (1), p.8-23
Main Authors: Quagio-Grassiotto, I, Ortiz, R.J, Pérez, M.H. Sabaj, Oliveira, C
Format: Article
Language:English
Subjects:
Advanced Basic Science
Animals
Ariidae
Aspredinidae
Auchenipteridae
Catfishes
Cetopsidae
Doradidae
Male
Pterodoras granulosus
Siluriformes
Siluroidei
Sperm ultrastructure
Spermatogenesis
Spermatogenesis - physiology
Spermatozoa - cytology
Spermatozoa - ultrastructure
Spermiogenesis
Teleostei
Thorny catfishes
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Summary:Abstract 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 III 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.
ISSN:0040-8166
1532-3072
DOI:10.1016/j.tice.2010.10.006