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In Hypsibius dujardini (Doyère, 1840), the endodermal region of the digestive system, which is called the midgut, spreads along the entire length of the body. Its wall is formed by a simple epithelium that is composed of digestive cells. In this paper, we present the first report on the presence of two groups of midgut regenerative cells that form two 'epithelial rings' - anterior and posterior. Additionally, we observed the proliferative abilities of the midgut regenerative cells, thus confirming the statement that they play the role of midgut stem cells. The precise ultrastructure of the digestive and regenerative cells was determined using transmission electron microscopy. Changes in the digestive and regenerative cells were correlated with the different stages of oogenesis. The process of oogenesis in H. dujardini took 4 days (at a temperature of 16 °C). Reserve material gradually accumulated in the cytoplasm of the digestive cells and histochemical staining showed that it primarily contained proteins, polysaccharides and a small quantity of lipids. The reserve material accumulated during vitellogenesis, and it began to decrease during choriogenesis. During the simplex stage, when the entire buccal-pharyngeal apparatus was expelled from the body, the stages of oogenesis were advanced, the midgut was much reduced, and the reserve material was exploited by the animal. [ABSTRACT FROM AUTHOR]

the article focuses on the three kinds of cell death that has been found in the midgut and hepatopancreas epithelium of the alimentary system of Neocaridina heteropoda including apoptosis, autophagy and necrosis.

The article studies the process of midgut epithelium formation during the development of Neocaridina heteropoda through the application of X-ray Microtomography (XMT).

The article focuses on the oogenesis in tardigrades belonging to the Parachela order, where germ cells goes through incomplete cytokinesis to form clustrer of cystocytes which are interconnected by cytoplasmic or intercellular bridges.

The article discusses about the ultrastructure of the midgut epithelium of Telodeinopus aoutii (Myriapoda, Diplopoda. Millipedes help in biodegradation and fragmentation of dead plants and other organic matter. The midgut of T. aoutii consists of layers of different cells separated from the body cavity by visceral muscles.

The article discusses a study aimed to examine the relationship between the oogenesis and storage bodies in Isophypsibius granulifer granulifer (Tardigrada: Eutardigrada), using transmission electron and light microscopy.

A conference paper about regeneration process of midgut epithelium in millipedes of the class Diplopoda and subphylum Myriapoda. The study used the easy to collect and easy to rear (under laboratory) species as materials and found cytoplasm of regenerative cells in the material species was poor in organelles, the article adds. Regenerative cells in this context also discussed in the article.