Morphology and ultrastructure of possible integumentary sense organs in the estuarine crocodile (Crocodylus porosus)

@article{Jackson1996MorphologyAU,
  title={Morphology and ultrastructure of possible integumentary sense organs in the estuarine crocodile (Crocodylus porosus)},
  author={Kate Jackson and David Gordon Butler and John H. Youson},
  journal={Journal of Morphology},
  year={1996},
  volume={229}
}
The skins of crocodylids and gavialids can be distinguished from those of alligatorids by the presence of darkly pigmented pits, known as integumentary sense organs (ISOs), on the postcranial scales. The structure of ISOs, in Crocodylus porosus, was studied using light microscopy and scanning and transmission electron microscopy. The stratum corneum of the epidermis in the area of the ISO is thinner, while the stratum germinativum is thicker, relative to other regions of the integument. Beneath… 

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References

SHOWING 1-8 OF 8 REFERENCES

A comparison of the epidermis and pigment cells of the crocodile with those in two lizard species

The greater uniformity in histological structure and in distribution of chemical substances throughout the depth of the crocodile stratum corneum was in marked contrast to the lizards, which showed morphological differences, and differences in intensities of chemical reactions in the horny cells laid down early and late in each keratinization cycle.

Ultrastructural organization of avian stratum corneum lipids as the basis for facultative cutaneous waterproofing

It is concluded that birds, whose homeothermic control depends so much on CWL, cannot possess a permanent “good barrier,” as such would compromise the heat loss mechanism.

Morphological and biophysical identification of fibrous proteins in the amniote epidermis.

It has been found that morphologic and/or tinctorial properties are not good criteria for the identification of specific fibrous protein types in reptilian epidermal material.

Habitat and phylogeny influence salinity discrimination in crocodilians: implications for osmoregulatory physiology and historical biogeography

This study investigated whether the ability to discriminate between hyper- and hypo-osmotic salinities is determined by habitat, as it is in other normally freshwater reptiles, or whether, like morphological adaptations associated with estuarine life, it has a phylogenetic basis.

Species identification of commercial crocodilian skins

La peau et les productions cutankes

  • 1970

Sensory nerve endings of the skin and deeper structures

    Identification of crocodilian skins and products

    • Wildlife Management : Crocodiles and Alligators
    • 1987