Abstract:
:The fine structure of midgut cells in two species of Cladocera (Crustacea: Branchiopoda) has unique features when it is compared to that in the midguts of other arthropods. Features which suggest that food is absorbed in digested form are: the presence of the peritrophic membrane, the glycocalyx, the almost complete absence of pinocytotic vesicles, and the large surface area of a great number of microvilli. Digested products presumably pass into the hemolymph through the network of extracellular canals and cisterns surrounding the basal ends of intestinal epithelial cells. Cells of the midgut in Cladocera differ from those of other arthropods in the simplicity of their basal plasma membranes, which are not highly folded. The small number of membrane invaginations suggests that water reabsorption is very slight, as is the usual condition in aquatic animals. The origin and evolution of peculiar structures we call "multivesicular-like bodies" have been investigated. These display a variety of different morphological features. Some contain acid phosphatase activity and are considered as specialized lysosomes.
journal_name
J Morpholjournal_title
Journal of morphologyauthors
Quaglia A,Sabelli B,Villani Ldoi
10.1002/jmor.1051500306subject
Has Abstractpub_date
1976-11-01 00:00:00pages
711-725issue
3eissn
0362-2525issn
1097-4687journal_volume
150pub_type
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journal_title:Journal of morphology
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