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Ultrastructure of spermiogenesis and the spermatozoon of Helicometra fasciata (Digenea, Opecoelidae), a parasite of Labrus merula (Pisces, Teleostei)

BiologySpermatogenesisDevelopmental BiologyPhylogeneticsFertilityEvolutionary BiologySperm BiologyGameteBiological Life CycleSemen AnalysisFertilisationReproductive BiologyLabrus MerulaPublic HealthMedicineHelicometra FasciataParasitologyEmbryology