[The organizational characteristics of the generative material and the the proliferative dynamics of trematode mother sporocysts].
Analysis of miracidia germinal material organization and proliferation dynamics of mother sporocysts enabled us to divide them into three well-defined groups. The first one includes species whose miracidia possess only differentiated (mature) generative cells and embryos of earlier stages of cleavage. In this case during parasite phase of development of maternal sporocysts the generative function is not performed. To the first group therefore trematode species with pedogenetic larvae could be attributed also. The next group embraces species whose miracidia as well as mature generated cells have some undifferentiated cells; thus the parasitic phase of mother sporocyst development acquires restricted proliferative capacity. The third group consists of species with higher trematodes dominating. They perform generative function exclusively at parasitic phase of mother sporocyst development. Representatives of more archaic and ancient species are the bases of the first two groups on the contrary. Such type of distribution can not occur occasionally and apparently reflects first steps of emergenes of parthenogenetic generations of trematodes.
Dobrovol'skiĭ
A A
AA
Galaktionov
K V
KV
Ataev
G L
GL
D000818:Animals; D007814:Larva / Q000145:classification / Q000254:growth & development; D008675:Metamorphosis, Biological / Q000502:physiology*; D012098:Reproduction / Q000502:physiology; D014200:Trematoda / Q000145:classification / Q000254:growth & development*