Apical cytoplasm of several digestive cells (dc) in millipede midgut. A. E. pulchripes. Microvilli (mv), midgut lumen (l), cortical layer (c), cisterns of the rough endoplasmic reticulum (RER), filaments in cortical layer (star), mitochondria (m), spheres of reserve material (rm), spherites (sp), endosomes (arrows). Longitudinal section. TEM. Scale bar = 3.5 µm. B. U. transsilvanicus. Higher magnification of Fig. E. Endosomes (arrows). TEM. Scale bar = 0.8 µm. C. E. pulchripes. Cortical layer (c) in the digestive cells within apical cytoplasm with distinct roots of filaments (f). Midgut lumen (l), microvilli (mv), mitochondria (m), endosomes (arrows). Longitudinal section. TEM. Scale bar = 1.8 µm. D. P. angustus. Microvilli (mv), midgut lumen (l), cortical layer (c), smooth septate junctions (arrowheads), cisterns of the endoplasmic reticulum (ER), mitochondria (m), spheres of reserve material (rm), spherites (sp), differentiating cell (dfc) with microvilli (mv) protruding the extracellular space (star), holocrine secretion (arrow), digestive cells (dc). Longitudinal section. TEM. Scale bar = 1.2 µm. E. U. transsilvanicus. Microvilli (mv), midgut lumen (l), cortical layer (c), endosomes (arrows), smooth septate junctions (arrowheads), mitochondria (m), spherites (sp), autophagosomes (au), cisterns of the rough endoplasmic reticulum (RER). Transverse section. TEM. Scale bar = 1.7 µm. F. G. tetrasticha. Microvilli (mv), midgut lumen (l), cortical layer (c), smooth septate junctions (arrows), accumulation of glycogen granules (g), mitochondria (m), spherites (sp), cisterns of the rough endoplasmic reticulum (RER), microapocrine secretion (arrowheads), digestive cells (dc). Longitudinal section. TEM. Scale bar = 1.3 µm.

 
 
  Part of: Rost-Roszkowska MM, Vilimová J, Tajovský K, Šustr V, Ostróżka A, Kaszuba F (2021) Structure of the midgut epithelium in four diplopod species: histology, histochemistry and ultrastructure. Arthropod Systematics & Phylogeny 79: 295-308. https://doi.org/10.3897/asp.79.e67022