Histochemical and fine structure observations of the intestinal epithelium ofTrichuris suis (Nematoda: Trichuroidea)

Jenkins, Trisha A.

doi:10.1007/bf02482635

Cited by 9 publications

(1 citation statement)

References 26 publications

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“…Similar spherites have also been observed in the midgut tissues of non-arthropod ecdysozoans (e.g. tardigrades [50], onychophorans [51], and nematodes [52]); consequently, it seems highly probable that they occurred in primitive arthropods like trilobites. The storage of CaPO 4 spherites has already been proposed as an explanation of the DS phosphatisation in Leanchoilia superlata and other arthropods from the Burgess Shale [4], [53], [54].…”

Section: Discussionsupporting

confidence: 59%

Controls on Gut Phosphatisation: The Trilobites from the Weeks Formation Lagerstätte (Cambrian; Utah)

Lerosey‐Aubril

Hegna

Kier³

et al. 2012

PLoS ONE

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Despite being internal organs, digestive structures are frequently preserved in Cambrian Lagerstätten. However, the reasons for their fossilisation and their biological implications remain to be thoroughly explored. This is particularly true with arthropods – typically the most diverse fossilised organisms in Cambrian ecosystems – where digestive structures represent an as-yet underexploited alternative to appendage morphology for inferences on their biology. Here we describe the phosphatised digestive structures of three trilobite species from the Cambrian Weeks Formation Lagerstätte (Utah). Their exquisite, three-dimensional preservation reveals unique details on trilobite internal anatomy, such as the position of the mouth and the absence of a differentiated crop. In addition, the presence of paired pygidial organs of an unknown function is reported for the first time. This exceptional material enables exploration of the relationships between gut phosphatisation and the biology of organisms. Indeed, soft-tissue preservation is unusual in these fossils as it is restricted to the digestive structures, which indicates that the gut played a central role in its own phosphatisation. We hypothesize that the gut provided a microenvironment where special conditions could develop and harboured a source of phosphorus. The fact that gut phosphatization has almost exclusively been observed in arthropods could be explained by their uncommon ability to store ions (including phosphorous) in their digestive tissues. However, in some specimens from the Weeks Formation, the phosphatisation extends to the entire digestive system, suggesting that trilobites might have had some biological particularities not observed in modern arthropods. We speculate that one of them might have been an increased capacity for ion storage in the gut tissues, related to the moulting of their heavily-mineralised carapace.

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Section: Discussionsupporting

confidence: 59%

Controls on Gut Phosphatisation: The Trilobites from the Weeks Formation Lagerstätte (Cambrian; Utah)

Lerosey‐Aubril

Hegna

Kier³

et al. 2012

PLoS ONE

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Some ultrastructural observations on the midgut epithelium of Isohypsibius augusti (Murray, 1907) (Eutardigrada)

Greven

1976

Cell Tissue Res.

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The midgut epithelial cells of the eutardigrade Isophypsibius augusti are organized into a convoluted monolayer. Only a single cell type could be distinguished although this cell type displayed considerable morphological variation. The midgut begins with crescent-shaped cells. More distally the cells are of variable height depending on the stored amount of nutritional material. No regenerative cells are present. Adjoining cells are held together by apical zonulae continuae. All the cells are characterized by a striated border, some basal infoldings, cytosis vesicles, numerous mitochondria, and abundant rough endoplasmic reticulum. Dictyosomes occur in small numbers. Ovoid or spherical inclusions (spherites), often concentrically laminated, are common. The cells, especially those along the middle part of the gut, are filled with large amounts of nutritional storage which includes polysaccharide material. The possible functions of the midgut in Tardigrada are discussed.

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Morphological and histochemical observations on the intestinal epithelium of Ascaridia galli (Nematoda: Ascaridida)

Parshad

Guraya

1978

Z. F. Parasitenkunde

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The intestinal epithelium of Ascardia galli has been studied with various cytological and cytochemical techniques. It consists of large epithelial cells resting on a thick collagenous basal lamina. Their luminal surface is provided with microvilli. The intestinal cells store considerable amounts of glycogen and neutral lipids. Some intracellular granular inclusions, which stain for proteins, phospholipids and lipoproteins, are distributed throughout the cytoplasm. The brush border is composed of microvilli whereas the outer surface coat consists of saliva resistant PAS-positive material. The detailed histochemical analysis of surface material has revealed that it is composed of nonacetylated acid mucopolysaccharides rich in hyaluronic acid with carboxylate polyanions. The brush border shows intense activities of acid phosphatase and glucose-6-phosphatase, moderate of ATPase, and lipase, weak of 5'-nucleotidase. Acid phosphatase-positive intracellular structures are seen in the intestinal epithelium which form distinct aggregations.

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Histochemical and fine structure observations of the intestinal epithelium ofTrichuris suis (Nematoda: Trichuroidea)

Cited by 9 publications

References 26 publications

Controls on Gut Phosphatisation: The Trilobites from the Weeks Formation Lagerstätte (Cambrian; Utah)

Controls on Gut Phosphatisation: The Trilobites from the Weeks Formation Lagerstätte (Cambrian; Utah)

Some ultrastructural observations on the midgut epithelium of Isohypsibius augusti (Murray, 1907) (Eutardigrada)

Morphological and histochemical observations on the intestinal epithelium of Ascaridia galli (Nematoda: Ascaridida)

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