The eutardigrade Thulinia stephaniae has an indeterminate development and the potential to regulate early blastomere ablations

@inproceedings{Hejnol2005TheET,
  title={The eutardigrade Thulinia stephaniae has an indeterminate development and the potential to regulate early blastomere ablations},
  author={Andreas Hejnol and Ralf Schnabel},
  booktitle={Development},
  year={2005}
}
We present a detailed analysis of the cell lineage of the tardigrade Thulinia stephaniae with a 4D-microscopy system (3D time-lapse recording). The recording, of the entire development from embryogenesis until hatching, allowed us to analyze the fate of single descendants from early blastomeres up to germ layer formation and tissue development. The embryo undergoes an irregular indeterminate cleavage pattern without early fate restriction. During gastrulation, mesodermal and endodermal… 

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References

SHOWING 1-10 OF 91 REFERENCES

Mesendoderm cell and archenteron formation in isolated blastomeres from the shrimp Sicyonia ingentis.

The results suggest that the mesendoderm cells are autonomously specified, possibly by cytoplasmic localization at the vegetal pole, and may also function as a signaling region to organize other developmental events.

Embryologische Untersuchungen an der holoblastischen Ontogenese vonPenaeus trisulcatus Leach (Crustacea, Decapoda)

Embryonic development of holoblastic Penaeidae to a free-swimming nauplius stage is completed within 12h overnight and clarifies some fundamental principles of arthropod development.

Development of the mesendoderm in the dendrobranchiate shrimp Sicyonia ingentis.

Cleavage and gastrulation in the shrimp Sicyonia ingentis: invagination is accompanied by oriented cell division.

The results showed that the mesendoderm cells which initiated gastrulation were derived from the vegetal 2-cell-stage blastomere, which could be distinguished by its slightly larger size and the location of the polar bodies.

Cell lineage in marine nematode Enoplus brevis.

It is suggested that a precise cell lineage is not a necessary attribute of nematode development and that the fates of the blastomeres of early E. brevis embryos, with the exception of the endoderm precursor, are not determined.

Cell lineage, axis formation, and the origin of germ layers in the amphipod crustacean Orchestia cavimana.

It is evident that the cleavage pattern and cell lineage of Orchestia cavimana are not of the spiral type, and the results of the labelling show many differences to cleavage patterns and cell lineages in other crustaceans, in particular, other Malacostraca.

Cell lineage analysis of the amphipod crustacean Parhyale hawaiensis reveals an early restriction of cell fates

These findings demonstrate for the first time a total cleavage pattern in an arthropod which results in an invariant cell fate of the blastomeres, but notably, the cell lineage pattern of Parhyale hawaiensis shows no clear resemblance to those found in spiralians, nematodes or deuterostomes.

The embryonic cell lineage of the nematode Caenorhabditis elegans.

Cleavage and gastrulation of the euphausiacean Meganyctiphanes norvegica (Crustacea, Malacostraca)

The cell lineage of early stages up to blastoderm formation of the euphausiacean Meganyctiphanes norvegica is reconstructed using recent methods of fluorescent staining and it is shown that the early cleavage pattern of M. norvesgica does not offer an example of a spiral cleavage within arthropods.
...