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The mode of sex determination in dinophilus gyrociliatus archiannelida


, : The mode of sex determination in dinophilus gyrociliatus archiannelida. International Journal of Invertebrate Reproduction & Development 11(2): 159-172

The regular occurrence of a univalent sex chromosome in male meiosis but not in female meiosis was confirmed by light (orcein staining of squash preparations) and electron microscopical (3-D-reconstruction of serial sections) techniques. Therefore, male heterogamety, most probably of the XO-XX type, is present in Dinophilus. This seems to be in conflict with the obvious occurrence of two types of eggs, large ones and small ones, that normally give rise to females and males, respectively. The review of available data shows that the control of egg ratio and therefore of sex ratio in Dinophilus gyrociliatus is progamic and influenced by environmental as well as genetic conditions. Sex determination eventually is syngamic and brought about by selective fertilization of large eggs by female determining sperms and of small eggs by male determining sperms.

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Related references

von Traut, W., 1970: Zur sexualitat von Dinophilus gyrociliatus (Archiannelida) 2. Die geschlechtsbestimmung. Biol. Zbl.: 89: 137-161

Jennings, J.B.; Gelder, S.R., 1969: Feeding and digestion in Dinophilus gyrociliatus (Annelida: Archiannelida). Journal of Zoology London, 158: 441-451

Traut, W., 1969: Zur Sexualitat von Dinophilus gyrociliatus (Archiannelida). 2. Der Aufbau des Ovars und die Oogenese. Biologisches Zentralblatt, 88: 695-714

Traut W., 1969: On the sexuality of dinophilus gyrociliatus archiannelida part 2 structure of the ovary and oogenesis. Biologisches Zentralblatt 88(6): 695-714

Traut, W., 1966: A mutant of Dinophilus gyrociliatus (Archiannelida) with enlarged male type eggs. Experientia 22(4): 237-238

Traut W., 1968: Genetic analysis of 2 mutants of dinophilus gyrociliatus archiannelida with changed egg size. Helgolaender Wissenschaftliche Meeresuntersuchungen 18(3): 296-316

Traut, W., 1968: Genetische Analyse zweier Mutanten von Dinophilus gyrociliatus (Archiannelida) mit veranderter Eigrosse. Helgolander Wissenschaftliche Meeresuntersuchungen, 18: 296-316

Traut, W., 1969: Zur Sexualitat von Dinophilus gyrociliatus (Archiannelida). 1. Der Einfluss von aussenbedingungen und genetiachen Faktoren auf das Geschlechtsverhaltnis. Biologisches Zentralblatt, 88: 469-495

Traut W., 1969: On the sexuality of dinophilus gyrociliatus archiannelida part 1 the influence of external conditions and genetic factors on the sex ratio. Biologisches Zentralblatt: 469-495

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