The embryonic value of the micromeres in Ilyanassa obsoleta, as determined by deletion experiments. I. The first quartet cells

@article{Clement1967TheEV,
  title={The embryonic value of the micromeres in Ilyanassa obsoleta, as determined by deletion experiments. I. The first quartet cells},
  author={A. C. Clement},
  journal={Journal of Experimental Zoology},
  year={1967},
  volume={166},
  pages={77-88}
}
  • A. C. Clement
  • Published 1967
  • Biology
  • Journal of Experimental Zoology
Each of the first quartet micromeres of Ilyanassa obsoleta has been removed at the 8-cell stage, and the effect of the loss observed in the larva. Removal of the 1a micromere resulted in all cases in absence of the left eye; a small reduction in size of the left lobe of the velum could frequently be detected also. In other observed details the larvae appeared complete. Absence of the 1b micromere resulted in a variable tendency toward synophthalmia, and some indication of… Expand
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. III. The third quartet cells and the mesentoblast cell, 4d
TLDR
Each third quartet micromere and the mesentoblast is judged to have a specific embryonic value and the generally good development of the main ectodermal derivatives of the body following removal of the mesENToblast do not suggest any role for it or its derivatives as the primary... Expand
The Role of the First Quartet Micromeres in the Development of the Polyclad Hoploplana inquilina
TLDR
It is indicated that the determination of embryonic axes leading to a larva with bilateral symmetry may involve micromere-macromere interactions, as has been shown in molluscan embryos with equal cleav... Expand
The morphogenetic significance of the first quartet micromeres for the development of the snailBithynia tentaculata
TLDR
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
Fate maps of the first quartet micromeres in the gastropod Ilyanassa obsoleta.
TLDR
First quartet lineage data are compared with results from previous cell ablation experiments and with lineage data from other species. Expand
Intermediate Stages in the Embryonic Development of the Gastropod Ilyanassa obsoleta: a Scanning Electron Microscope Study
TLDR
Scanning electron microscopy was used to study embryonic development of the mud snail, Ilyanassa obsoleta, from the fourth to the seventh day of development (70 to 165 hr post-trefoil at 20° C), with particular attention to shell field morphogenesis. Expand
Embryonic development of Bithynia tentaculata L. (Prosobranchia, Gastropoda). I: Cleavage
TLDR
The cell-lineage of Bithynia tentaculata L. has been studied through the formation of the fourth quartet of micromeres, i.e., the 81-cell stage, andilateral symmetry is established by theformation of the mesentoblast 4d at the future dorsal side. Expand
Regulative development in the pulmonate gastropod, Lymnaea palustris, as determined by blastomere deletion experiments
TLDR
It is proposed that the regulative ability of partial embryos depends on the rearrangement of cells relative to the D macromere before inductive activities begin at or after the 24-cell stage. Expand
Regulative development in a spiralian embryo as shown by cell deletion experiments on the Acoel, Childia.
  • B. Boyer
  • Biology, Medicine
  • The Journal of experimental zoology
  • 1971
TLDR
The regulative capacity of the acoel embryo suggests that this order lies near the ancestral line of the spiralia and represents an evolutionary stage where the very defined pattern of spiral cleavage is not yet associated with early programming of the cell's fate. Expand
Regulative and mosaic development of Ilyanassa obsoleta embryos lacking the A and C quadrants
TLDR
It is clear that the D quadrant is necessary for the normal development of bilateral organs, even though it does not directly contribute to them, and it can regulate the production of these organs when the A and C blastomeres are deleted. Expand
...
1
2
3
4
5
...