Abstract
Spermiogenesis inNeopolystoma spratti conforms to the basic pattern found in polyopisthocotylean monogeneans and in Trematoda Digenea and Trematoda Aspidogastrea. The zone of differentiation exhibits a complete ring of cortical microtubules, two initially free flagella with prominent striated rootlets and an intercentriolar body between them. Mitochondria and nucleus migrate into a median cytoplasmic process and flagella rotate and fuse with this process. Mitochondria fuse to form a single elongated mitochondrion and the nucleus moves to a distal location. Mature sperm have two incorporated axonemes for most of their length, a single elongate mitochondrion and a nucleus. Peripheral microtubules form an incomplete ring in the most proximal region and a complete ring in the adjacent region containing two axonemes and the mitochondrion. In the principal region (where the nucleus is present) they form an incomplete ring and are interpreted as originating from the dorsal and ventral faces of the median cytoplasmic process. Thus, although there are more microtubules in the principal region than at either end, the situation is essentially the same as that found in polyopisthocotylean monogeneans, digeneans and aspidogastreans, with no addition of extra lateral microtubules.
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References
Bekkouche Z, Fournier A, Peyriere M (1974) Différences ultrastructurales entre Monogènes Monopisthocotylea et Polyopisthocotylea, parasites d'Amphibiens. Proceedings, 3rd International Congress on Parasitology, 25–31 August, Munich, pp 416–417
Cable J, Tinsley RC (1993) The ultrastructure of spermatogenesis and spermatozoa inPseudodiplorchis americanus (Monogenea, Polystomatidae). Can J Zool 71:1609–1619
Fournier A (1980) Les Monogènes d'Amphibiens. Approche ultrastructurale des modifications adaptatives au cours du cycle et des relations phylétiques. Thèse d'État, Université de Perpignan. France
Jamieson BGM, Daddow LM (1982) The ultrastructure of the spermatozoon ofNeochasmus sp. (Cryptogonimidae, Digenea, Trematoda) and its phylogenetic significance. Int J Parasitol 12:547–559
Justine J-L (1985) Étude ultrastructurale comparée de la spermiogenèse des Digènes et des Monogènes (Platyhelminthes). Relations entre la morphologie du spermatozoïde, la biologie de la fécondation et la phylogénie. Thèse d'Etat. Université des Sciences et Techniques du Languedoc (Montpellier II), France
Justine J-L (1991a) Phylogeny of parasitic Platyhelminthes: a critical study of synapomorphies proposed from the ultrastructure of spermiogenesis and spermatozoa. Can J Zool 69:1421–1440
Justine J-L (1991b) Cladistic study in the Monogenea (Platyhelminthes), based upon a parsimony analysis of spermiogenetic and spermatozoal characters. Int J Parasitol 21:821–838
Justine J-L (1992) Ultrastructure of spermiogenesis, spermatozoa and the tegument inAtriaster sp. (Platyhelminthes, Monogenea, Polyopisthocotylea, Microcotylidae). Zool Scr 21:231–238
Justine J-L (1993a) Phylogénie des Monogènes basée sur une analyse de parcimonie des caractères de l'ultrastructure de la spermiogénèse et des spermatozoïdes incluant les résultats récents. Bull Fr Peche Piscic 328:137–155
Justine J-L (1993b) Ultrastructure of the Monogenea: lists of investigated species and organs. Bull Fr Pêche Piscic 328:156–188
Justine J-L, Mattei X (1985a) Particularités ultrastructurales des spermatozoïdes de quelques Monogènes Polyopisthocotylea. Ann Sci Nat Zool Biol Anim 7:143–152
Justine J-L, Mattei X (1985b) Ultrastructure du spermatozoïde de trois Monogènes Polyopisthocotylea:Cemocotyle, Heteraxine etHeteraxinoides. Ann Parasitol Hum Comp 60:659–663
Justine J-L, Le Brun N, Mattei X (1985) The aflagellate spermatozoon ofDiplozoon (Platyhelminthes: Monogenea: Polyopisthocotylea): a demonstrative case of relationship between sperm ultrastructure and biology of reproduction. J Ultrastruct Res 92:47–54
Lebedev BI (1988) Monogenea in the light of new evidence and their position among platyhelminths. Angew Parasitol 29:149–167
Pichelin S (1995) The taxonomy and biology of the Polystomatidae (Monogenea) in Australian freshwater turtles (Chelidae, Pleurodira). J Nat Hist (in press)
Rohde K, Watson NA (1994a) Spermiogenesis inGonoplasius sp. (Platyhelminthes, Monogenea, Polyopisthocotylea, Microcotylidae). Acta Parasitol 39:111–116
Rohde K, Watson NA (1994b) Ultrastructure of spermiogenesis and spermatozoa ofPolylabroides australis (Platyhelminthes, Monogenea, Polyopisthocotylea, Microcotylidae). Parasite 1:115–122
Schmahl G, Obiekezie A (1991) Fine structure of spermatogenesis in polyopisthocotylid monogeneans (Protomicrocotyle ivoriensis, Gastrocotyle sp.). Parasitol Res 77:115–122
Stitt AW, Fairweather I (1990) Spermatogenesis and the fine structure of the mature spermatozoon of the liver fluke,Fasciola hepatica (Trematoda: Digenea). Parasitology 101:395–407
Watson NA, Rohde K (1991) Ultrastructure of spermatogenesis and sperm ofMulticotyle purvisi (Trematoda, Aspidogastrea). Zoomorphology 110:347–356
Watson NA, Rohde K (1992) Ultrastructure of sperm and spermatogenesis ofRugogaster hydrolagi, Schell 1973 (Platyhelminthes, Trematoda, Aspidogastrea, Rugogastridae). Parasitol Res 78:516–524
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Watson, N.A., Rohde, K. Ultrastructure of spermiogenesis and spermatozoa ofNeopolystoma spratti (Platyhelminthes, Monogenea, Polystomatidae). Parasitol Res 81, 343–348 (1995). https://doi.org/10.1007/BF00931542
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DOI: https://doi.org/10.1007/BF00931542