A comparison of the structure and function of the cerotegument in two species of Cryptostigmata (Acarina)

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Abstract
Cerotegument plastron structure and function are compared in two species of non-related Cryptostigmata from different families in two environments prone to flooding, namely soil and leaf litter, as represented by Euzetes globulus (Nicolet) (Euzetidae), and the intertidal zone by Ameronothrus marinus (Banks) (Ameronothridae). Differences in cerotegument structure reflect the degree of exposure to mechanical stresses and hydrostatic pressure encountered in these two environments. Cerotegument plastrons communicate with the tracheal system in heavily armoured species, e.g. E. globulus, but gas transfer may occur across the cuticle in those species having a lightly sclerotized leathery cuticle, e.g. A. marinus.