Keywords
egg-shell
ultraestructure
How to Cite
Abstract
The egg shells of Pseudemys scripta have two layers, one external of calcium salts and the internal of a proteic nature. The multishaped structures ("units") of the calcareous layer are bordered by groves that allow sorne expanssion when the egg becomes turgent. Those units are made of series of concentric lamellae, rich in thin or short needles. The proteic layer has two regions, the external one with fibers internall in several dirrctions; the internal layer is a thin invaginated film.References
Acuña M., R.A. 1980. Aspectos biológicos de la fase terrestre de la tortuga lora Lepidochelys olivacea. Tesis para optar al grado de Magister Scientiae en Biología. 115 p.
Acuña M., R.A. 1984. La ultraestructura superficial de la cáscara de huevo de la tonuga marina Lepidochelys olivacea Eschscholtz. Brenesia 22: 299- 308.
Acuña M., R.A. 1987. Comparación de la ullraeslructura de la cáscara del huevo de la tortuga Rhinoclemmys pulcherrima con la de los huevos de otros reptiles. Rev. Biol. Trop. 35(1), 41 - 48.
Ewert, M.A. 1979. The embryo and its egg: development and natural history, p. 333-413 In. M. Harless & M. Morlock (eds.). Turtles: Perspectives and Research. John Wiley and Sons, Nueva York.
Ewert, M. A., S.J. Firth & C.E. Nelson. 1984. Normal and multiple eggshells in batagurine turtles and their implications for dinosaurs and other reptiles. Can. 1. Zool. 62: 1834 - 1841.
Gans, C. 1985. Eggshells and their development, p. 79-91 In
Biology of the Reptilia, Vol. 14-A. John Wiley and Sons, Nueva York.
Hirsch, K.F. 1983. Contemporary and fossil chelonian eggshells. Copeia 1983 (2): 282-297.
Hirsch, K.F. 1985. Fossil crocodilian eggs from the Eocene of Colorado. J. Paleont. 59(3): 531-542.
Hirsch, K.F. & M.J. Packard. 1987. Review ofthe fossil eggs and their shell structure. Sean. Micr. 1(1): 383-400.
Lamb, T. & J.D. Congdon. 1985. Ash content: Relationship to flexible and rigid eggshell types of turtles. J. Herpetol. 19(4): 527-530.
Legler, J.M. 1966. Notes on the natural history of a rare CentralAmerica turtle. Kinosternon angustipons Legler. Herpetologica 22(2): 118-122.
Packard, M.J. 1980. Ultrastructural morphology of the shell and shell membrane of eggs of common snapping turtles (Chelydra serpentina). J. Morphol. 165: 187-204.
Packard, J.M. & G.C. Packard. 1979. Struture of the shell and tertiary membranes of eggs of softshell turtles (Trionyx spiniferus). J. Morphol. 159(1): 131-143.
Packard, M.J. & K.F Hirsch. 1986. Scanning electron microscopy of eggshells of contemporary reptiles. Scanning electron microscopy. 1986 (IV): 1581-1590.
Packard, J.J. & G.C. Packard. 1986. Efiecl of water balance on growth and calcium mobilization of embryonic painted turtles (Chrysemys picta). Physiol. Zool. 59 (4): 398-405.
Packard. M.J., G.C. Packard & T.J. Boardman. 1982. Structure of eggshells and water relations of reptilian eggs. Herpetologica. 5 (1982):137-154.
Packard, M.J., K.F. Hirsch & J.B. Iverson. 1984a. Structure of shells from eggs of kinostemid turtles. Journal of Morphology 181: 9-20.
Packard, J.J., J.B. Iverson & G.C. Packard. 1984b. Morphology of shell formation in eggs of the turtle Kinosternon flavercens. Journal of Morphology 181: 21-28.
Packard, G.C., T.L. Taigen, J.J. Boardman, M.J. Packard & C.R. Tracy 1979. Changes in mass of softshell turtle (Trionyx spiniferus ) eggs incubated on substrates differing in water potencial. Herpetologica 35(1): 78-86.
Packard, G.C; M.J. Packard; T.J. Boardman & D. Aschen. 1981 a. Possible adaptive value of water exchanges in flexibleshelled eggs of turtles. Science: 213: 471-473.
Packard, G.C.; T.L. Taigen, M.J. Packard & T.J. Boardman. 1981 b. Changes in mass oC eggs of softshell turtles (Trionyx spiniferus ) incubated under hydric conditions simulating those of natural nests. J. Zool. Lond. 1981 (193): 81-90.
Pritchard, P.C.H. 1979. Encylopedia of Turtles. T.F.H. Publ., Neptune, New Jersey. 895 pag.
Silyn-Roberts, H. & R.M. Sharp. 1985. Preferred orientation of calcite and aragonite in the reptilian eggshells. Proc. R. Soc. Lond. B 227-445-455.
Silyn-Roberts, H. & R.M. Sharp. 1986. Crystal growth and the role of the organic network in eggshell biomineralization. Proc. R. Soco Lond. B 227: 303-324.
Solomon, S.E. & Baird. 1979. Aspects of the biology of Chelonia mydas 1. Oceanogr. Mar. Biol. Ann. Rev. 17: 347-361.
Comments
This work is licensed under a Creative Commons Attribution 4.0 International License.
Copyright (c) 1989 Revista de Biología Tropical