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Buccal capsule and intestine ultrastructure of the marine predatory nematode Sphaerolaimus balticus (Monhysterida: Sphaerolaimidae)статья
- Авторы: Tchesunov A.V., Fedyaeva M.A.
- Журнал: Nematology
- Год издания: 2019
- Издательство: BRILL ACADEMIC PUBLISHERS
- Местоположение издательства: PLANTIJNSTRAAT 2, P O BOX 9000,LEIDEN, NETHERLANDS, 2300 PA
- DOI: 10.1163/15685411-00003308
- Аннотация: The ultrastructural morphology of the buccal capsule and intestine (midgut) of the predatory marine nematode Sphaerolaimus balticus is investigated. Major part of the voluminous barrel-shaped buccal capsule is made up by strongly modified somatic cuticle and hence presents itself an intricately differentiated cheilostome. The latter consists of three compartments, i.e. 1) labial region, 2) striated region with six rows of fine longitudinal ribs, and 3) shagreen band penetrated by about ten projections of arcade tissue. Gymnostome and telostome are narrow and constitute together a small posterior portion of the buccal capsule. The mouth is evidently opening by contraction of anterior longitudinal somatic muscles. Intestine is characterized by very thin and homogenous basal lamina. Cytoplasm of the enterocytes contains lipid granules, large electron-light vacuoles, and rounded concentric inclusions in membranous vacuoles. Apical microvilli are separated from the lumen by dense three-layered glycocalyx resembling a peritrophic membrane in the intestine of arthropods. The glycocalyx is only a supportive structure of the midgut. The most peculiar feature of the intestine is the strong particular junctures connecting glycocalyx with cells. The junctures present cytoplasmic bundles attached to the dense glycocalyx layer by dint of hemidesmosomes.
- Добавил в систему: Чесунов Алексей Валерьевич