The embryonic value of the micromeres in Ilyanassa obsoleta, as determined by deletion experiments. III. The third quartet cells and the mesentoblast cell, 4d

@article{Clement1986TheEV,
  title={The embryonic value of the micromeres in Ilyanassa obsoleta, as determined by deletion experiments. III. The third quartet cells and the mesentoblast cell, 4d},
  author={A. C. Clement},
  journal={International journal of invertebrate reproduction and development},
  year={1986},
  volume={9},
  pages={155-168}
}
  • A. C. Clement
  • Published 1986
  • Biology
  • International journal of invertebrate reproduction and development
Summary Each of the third quartet micromeres and the mesentoblast of the fourth quartet was removed and the effects on larval development analyzed. Removal of 3a resulted in a reduction in size of the left velar lobe. Removal of 3b resulted in a moderate reduction in size of the right velar lobe. Removal of 3c resulted in the absence of the right half of the foot and usually the right statocyst. Removal of 3d resulted in the absence of the left half of the foot and the left statocyst. Removal… Expand
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The role of unequal cleavage and the polar lobe in the segregation of developmental potential during first cleavage in the embryo of Chætopterus variopedatus
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The results indicate that the vegetal region of the CD cell of Chætopterus is analogous to polar lobes which have been studied in other species, and is therefore important in the specification of the D quadrant. Expand
Cell contact-dependent positioning of the D cleavage plane restricts eye development in the Ilyanassa embryo
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References

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The embryonic value of the micromeres in Ilyanassa obsoleta, as determined by deletion experiments. II. The second quartet cells
TLDR
Each second quartet micromere of Ilyanassa obsoleta is judged to have a different embryonic value on the basis of the deletion experiments. Expand
The embryonic value of the micromeres in Ilyanassa obsoleta, as determined by deletion experiments. I. The first quartet cells
TLDR
The Ilyanassa embryo shows both mosaic and regulative features, and the results are compared with deductions from cell lineage work on the related form Crepidula, and they are considered also from the standpoint of regulative capacity. Expand
The morphogenetic significance of the first quartet micromeres for the development of the snailBithynia tentaculata
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It is concluded that in these eggs dorsoventrality is determined by segregation of the polar lobe, and the capacity to form head structures is restricted to the first quartet of micromeres. Expand
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Since hyaline fragments may segment normally and may produce actively swimming dwarf larvae of nearly normal appearance, it seems probable that the basis of localization, cleavage-patterns, and differentiation must be sought in the apparently structureless hyoplasm or ground-substance. Expand
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TLDR
To determine the cell lineage of the shell gland in Ilyanassa, the 2d and 2c micromeres were marked with carbon granules, finding that any ectoderm-endoderm combination has the histogenetic ability to form shell material. Expand
Cell Determination and Organogenesis in Molluscan Development: A Reappraisal Based on Deletion Experiments in Ilyanassa
The vegetal region of the Ilyanassa egg, incorporated into the polar lobe and segregated to the D blastomere, appears to have an organizing influence in development. The results of deletingExpand
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