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You are here: Home / Associated publications / Belgian Journal of Zoology / Bibliographic References / Differentiation of the epidermis of neck, tail and limbs in the embryo of the turtle Emydura macquarii (Gray, 1830)

L Alibardi (1999)

Differentiation of the epidermis of neck, tail and limbs in the embryo of the turtle Emydura macquarii (Gray, 1830)

BELGIAN JOURNAL OF ZOOLOGY, 129(2):391-404.

The development of the skin in turtles and the differentiation of the first keratinized layers are largely unknown processes. The histology and ultrastructure of the developing skin of neck, tail and limbs of the embryo of the turtle Emydura macquarii were studied. This study showed that three to four embryonic layers are initially formed from the basal layer. They contain scarce bundles of 8-12 nm-thick intermediate filaments of keratin, and many coarse 28-35 nm-thick filaments of unknown nature. The coarse filaments form reticulate bodies similar to those of lepidosaurian reptiles and birds, and form large aggregations within corneocytes of the embryonic epidermis. Embryonic layers also contain mucus and vesicular bodies, the latter associated with lipid droplets. Lipids and mucus are partly discharged into the amniotic fluid. Shortly before hatching, typical alpha-keratinocytes, containing keratin filaments and no coarse filaments, replace the embryonic epidermis. Mucus and lipids are, however, retained among alpha-keratinocytes after hatching. The loose dermis of early embryonic stages rapidly turns into a dense connective tissue that strengthens the delicate epidermis. Large collagen fibrils contact the basement membrane of the epidermis of the tail. Lipidic material is also stored in dermal fibroblasts.

turtle (Emydura macquarii); embryo; soft skin; ultrastructure
BJZ

ISSN 2295-0451 (online version)
ISSN 0777-6279 (printed version)
impact factor 2015: 0,87.

Editor-in-Chief:
Prof. Dr. Isa Schön
Royal Belgian Institute of Natural Sciences
Vautierstraat 29
1000 Brussels, Belgium

 



1863-1903
Annales de la Société malacologique de Belgique
 
1903-1923
​Annales de la Société royale malacologique et zoologique de Belgique
 
1923-1989
Annales de la Société Royale Zoologique de Belgique
 
1989-
Belgian Journal of Zoology