Skip to main content
SpringerLink
Log in

On gastrulation in chelonia

Geœmyda trijuga coronata Anderson andLissemys punctata granosa Schoepff

  • Published:
Proceedings / Indian Academy of Sciences

Summary

Gastrulation inGeœmyda trijuga coronata andLissemys punctata granosa begins with distinctinvagination followed by a process ofinvolution andcell migration. The archenteric pouch is not co-extensive with the epiblastic embryonic shield and hence cell proliferation and migration are important factors in the formation of the primary germinal layers. The invagination of the endoderm cells is the first event in the initial process of gastrulation. It is only after the endoderm material has completely invaginated that the presumptive notochordal cells migrate backwards preceded by the prechordal plate cells. A prechordal plate is seen in the mature gastrula at the anterior end of the notochordal band in which position it lies below the anterior end of the neural plate area. The mesoderm arises by involution of cells at the lateral lips of the blastopore and also by cell proliferation from the median notochordo-endodermal band. Posteriorly mesoderm is proliferated from the primitive plate. It is possible that the mesoderm of the prechordal plate is proliferated from the primary endoderm.

This is a preview of subscription content, log in via an institution to check access.

Access this article

Log in via an institution

Price excludes VAT (USA)
Tax calculation will be finalised during checkout.

Instant access to the full article PDF.

Institutional subscriptions

Similar content being viewed by others

Abbreviations

a.p. :

Area pellucida

ao. :

Area opaca

ach. :

Archenteron (Notochordal canal)

blp. :

blastopore

ch. hy. :

Chorda hypoblast

d.l. :

Dorsal lip of the blastopore

en. :

Primary endoderm

e.p. :

Epibast

e.s. :

Embryonic shield

l.lp. :

Lateral lip of the blastopore

p.p. :

Primitive plate

pch. :

Prechordal plate

v.o. :

Ventral (internal) opening of the blastopore

y.k. :

Yolk

References

  1. Agassiz, L... “Embryology of the Turtle,”Cont. Nat. Hist. Uni. St., Boston, 1857, 1 and 2, 451–643.

    Google Scholar 

  2. Mitsukuri, K. and Ishikawa, C. “On the formation of the germinal layers of Chelonia,”Quart. Jour. Micr. Sci., London, 1887,27.

  3. Mehnert, E. .. “Gastrulation and Keimblatterbildung der Emys lutaria taurica,”Morphol. Arbeiten, 1891,Bd. 1, Heft 3.

  4. Mitsukuri, K... “Further studies on the formation of the germinal layers in Chelonia,”J. Col. Sci. Imp. Uni., Japan, 1893,5, 35–52.

    Google Scholar 

  5. —————.. “On the process of gastrulation in Chelonia,” Ibid., 1894,6, 227–77.

    Google Scholar 

  6. Kerr J. Graham..Text Book of Embryology, Vol. II. Vertebrata with the exception of Mammalia. Macmillan and Company, London, 1919.

    Google Scholar 

  7. Jenkinson..Vertebrate Embryology. Oxford University Press, London, 1925.

    Google Scholar 

  8. Pasteels.. “Etudes sur la gastrulation des vertebres meroblastiques. II. Reptiles,”Archives de Biologie, Paris, 1937,48, 105.

    Google Scholar 

  9. Nelson ..Comparative Embryology of the Vertebrates, London, 1953.

Download references

Author information

Authors and Affiliations

  1. Department of Zoology, Sanatana Dharma College, Sanatanapuram, Alleppey

    M. Chandrasekharan Nayar M.Sc. (Government of India Research Scholar)

Authors
  1. M. Chandrasekharan Nayar M.Sc.
    View author publications

    You can also search for this author in PubMed Google Scholar

Additional information

Communicated by Dr. C. S. Venkateswaran,f.a.sc.

Rights and permissions

Reprints and permissions

About this article

Cite this article

Chandrasekharan Nayar, M. On gastrulation in chelonia. Proc. Indian Acad. Sci. 49, 402–407 (1959). https://doi.org/10.1007/BF03053876

Download citation

  • Received:

  • Issue Date:

  • DOI: https://doi.org/10.1007/BF03053876

Keywords

Search

Navigation