spermiogenesis and spermatozoon of the tapeworm ligula intestinalis (diphyllobothriidea): phylogenetic implications.using transmission electron microscopy, spermiogenesis and the spermatozoon ultrastructural organization are described in ligula intestinalis (linnaeus, 1758) (diphyllobothriidea), a parasite of the great crested grebe podiceps cristatus (linnaeus, 1758). spermiogenesis starts with the differentiation zone of 2 striated rootlets, 2 centrioles giving rise to 2 flagella, and an intercentriolar body. the latter is composed of 5 electron-dense layers separating 4 electron-lucent layers. in the early ...200918576887
long-term dynamics of ligula intestinalis and roach rutilus rutilus: a study of three epizootic cycles over thirty-one are presented on 2 full epizootic cycles and the start of a third of ligula intestinalis in roach rutilus rutilus in a small lake, and the relationships of these cycles to the densities of rudd, scardinius erythrophthalmus, and great crested grebes, podiceps cristatus, over 31 years. the parasite was introduced to the lake by p. cristatus in 1973 at a time when the roach population had increased in response to eutrophication to a level at which individual fish growth was stunted and the hit ...200111578089
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