Flea Ctenophthalmus: heterogeneous hexagonally organized layer in the midgut.
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.
D000818:Animals; D001485:Basement Membrane; D002462:Cell Membrane; D003238:Connective Tissue / Q000033:anatomy & histology*; D005753:Gastric Mucosa / Q000033:anatomy & histology*; D008854:Microscopy, Electron; D011196:Potassium Permanganate; D005423:Siphonaptera / Q000033:anatomy & histology*
D011196:Potassium Permanganate