Stoma and intestine ultrastructure of the marine free-living nematode Odontophora deconincki (Nematoda: Araeolaimida: Axonolaimidae)

Fedyaeva, M.A.; Tchesunov, A.V.

Авторы: Fedyaeva Maria A., Tchesunov Alexei V.
Журнал: Nematology
Год издания: 2021
Издательство: BRILL ACADEMIC PUBLISHERS
Местоположение издательства: PLANTIJNSTRAAT 2, P O BOX 9000,LEIDEN, NETHERLANDS, 2300 PA
Первая страница: 1
Последняя страница: 18
DOI: 10.1163/15685411-bja10114
Аннотация: The fine morphology of the buccal capsule and intestine (midgut) of the marine free-living nematode Odontophoradeconincki was investigated. The cheilostome is armed with six equal claw-like odontia that can evert radially by opening the mouth.Light-refracting accessory buccal structures within the cheilostomatal cuticle alternate with odontia and consist of two elements:anterior armilloids and posterior granular armilliths. The buccal cavity (pharyngostome) is surrounded by a complex of longitudinaland oblique muscles partially attached to the cheilostome cuticle at the sites of the accessory buccal structures and enabling a wideopening of the mouth. With the described stoma condition, the nematode probably scrapes food particles from the substrate surface.In cross-section, the midgut consists of 5-7 cells that appear uniform throughout its length. An extracellular matrix (glycocalyx) overthe microvillar brush varies in thickness and stratification depending on presence or absence of food content in the lumen. Abundantspherocrystals (globular inclusions with concentric striations) were present in all gut cells. No indication of endocytosis or digestivevacuoles was observed in the gut cells and extracellular digestion predominates. Most specimens had a gut content formed from along cylinder of compressed flocculent material with some barely identifiable components and few spherocrystals expelled from theenterocytes. We assume that the nematode diet comprises a wide range of objects, mainly eukariotic epigrowth organisms, which areshorn off and scraped from the surface of sand grains and then ingested.
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Stoma and intestine ultrastructure of the marine free-living nematode Odontophora deconincki (Nematoda: Araeolaimida: Axonolaimidae)статья

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