Flea Ctenophthalmus : Heterogeneous Hexagonally Organized Layer in the Midgut

Abstract
The ventriculus or midgut of adult fleas of the genus Ctenophthalmus (Hystricopsyllidae) is surrounded by a complex investment consisting of a "beaded layer," circumferential and longitudinal muscles, minute fibrils of the sort commonly called collagenous, and a granular layer at the boundary of the hemocoel. The beaded layer is remarkable in consisting of two types of short cylinders of greatly different diameters, each type arranged in a mixed hexagonal array.

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