hypostracum

hypostracum

[¦hī·pō¦strak·əm]
(invertebrate zoology)
The innermost layer of the cuticle of ticks lying above the hypodermis.
References in periodicals archive ?
The plates are composed of calcium carbonate and are composed of three layers, outer or dorsal tegmentum, articulamentum, and ventral hypostracum.
Some of the horizontal canals curve over the edge of the articulamentum layer and extend vertically to the ventral surface of the hypostracum layer (Fig.
10 arrow at contact of hypostracum and articulamentum layers).
No distinction could be seen between the thin tegmentum and thicker hypostracum layers based upon the preserved shell microstructure.