Functional Histology and Ultrastructure of the Digestive Tract in Two Species of Chitons (Mollusca, Polyplacophora)

Detalhes bibliográficos
Autor(a) principal: Lobo-da-Cunha, Alexandre
Data de Publicação: 2022
Outros Autores: Alves, Ângela, Oliveira, Elsa, Calado, Gonçalo
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
Texto Completo: http://hdl.handle.net/10362/143550
Resumo: . Publisher Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
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spelling Functional Histology and Ultrastructure of the Digestive Tract in Two Species of Chitons (Mollusca, Polyplacophora)Electron microscopyHistochemistryIntestineOesophagusPolyplacophoraStomachCivil and Structural EngineeringWater Science and TechnologyOcean Engineering. Publisher Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.To continue the investigation on the digestive system of polyplacophoran molluscs, a histological and ultrastructural study of the oesophagus, stomach and intestine of Chaetopleura angulata and Acanthochitona fascicularis was carried out. Stomach content examination revealed an omnivorous diet. In both species the epithelium of the whole digestive tract consisted mostly of elongated absorptive cells with an apical border of microvilli. Cilia were also frequently present. Mitochondria and electron-dense lysosomes were the prominent organelles in the region above the nucleus. The basal region was characterised by an association of mitochondria, peroxisomes and lipid droplets. In general, glycogen deposits were also abundant in absorptive cells. The ultrastructural features indicate that the absorptive cells of the digestive tract epithelium are involved in endocytosis, intracellular digestion and storage of reserves. Histochemical techniques showed that the secretory cells of the digestive tract contained proteins and polysaccharides in their secretory vesicles. The secretory cells with vesicles of low electron density were classified as mucous cells, and the ones with electron-dense vesicles were designated basophilic cells due to their staining by basic dyes in light microscopy. Additionally, basal cells that seem to correspond to enteroendocrine cells containing oval electron-dense vesicles were found along the digestive tract epithelium of both species. The thin outer layer of the digestive tract wall consisted of muscle cells and nerves embedded in connective tissue.MARE - Centro de Ciências do Mar e do AmbienteRUNLobo-da-Cunha, AlexandreAlves, ÂngelaOliveira, ElsaCalado, Gonçalo2022-09-06T22:42:19Z2022-01-262022-01-26T00:00:00Zinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/article25application/pdfhttp://hdl.handle.net/10362/143550eng2077-1312PURE: 46288061https://doi.org/10.3390/jmse10020160info:eu-repo/semantics/openAccessreponame:Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)instname:Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãoinstacron:RCAAP2024-03-11T05:21:59Zoai:run.unl.pt:10362/143550Portal AgregadorONGhttps://www.rcaap.pt/oai/openaireopendoar:71602024-03-20T03:51:00.543452Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informaçãofalse
dc.title.none.fl_str_mv Functional Histology and Ultrastructure of the Digestive Tract in Two Species of Chitons (Mollusca, Polyplacophora)
title Functional Histology and Ultrastructure of the Digestive Tract in Two Species of Chitons (Mollusca, Polyplacophora)
spellingShingle Functional Histology and Ultrastructure of the Digestive Tract in Two Species of Chitons (Mollusca, Polyplacophora)
Lobo-da-Cunha, Alexandre
Electron microscopy
Histochemistry
Intestine
Oesophagus
Polyplacophora
Stomach
Civil and Structural Engineering
Water Science and Technology
Ocean Engineering
title_short Functional Histology and Ultrastructure of the Digestive Tract in Two Species of Chitons (Mollusca, Polyplacophora)
title_full Functional Histology and Ultrastructure of the Digestive Tract in Two Species of Chitons (Mollusca, Polyplacophora)
title_fullStr Functional Histology and Ultrastructure of the Digestive Tract in Two Species of Chitons (Mollusca, Polyplacophora)
title_full_unstemmed Functional Histology and Ultrastructure of the Digestive Tract in Two Species of Chitons (Mollusca, Polyplacophora)
title_sort Functional Histology and Ultrastructure of the Digestive Tract in Two Species of Chitons (Mollusca, Polyplacophora)
author Lobo-da-Cunha, Alexandre
author_facet Lobo-da-Cunha, Alexandre
Alves, Ângela
Oliveira, Elsa
Calado, Gonçalo
author_role author
author2 Alves, Ângela
Oliveira, Elsa
Calado, Gonçalo
author2_role author
author
author
dc.contributor.none.fl_str_mv MARE - Centro de Ciências do Mar e do Ambiente
RUN
dc.contributor.author.fl_str_mv Lobo-da-Cunha, Alexandre
Alves, Ângela
Oliveira, Elsa
Calado, Gonçalo
dc.subject.por.fl_str_mv Electron microscopy
Histochemistry
Intestine
Oesophagus
Polyplacophora
Stomach
Civil and Structural Engineering
Water Science and Technology
Ocean Engineering
topic Electron microscopy
Histochemistry
Intestine
Oesophagus
Polyplacophora
Stomach
Civil and Structural Engineering
Water Science and Technology
Ocean Engineering
description . Publisher Copyright: © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
publishDate 2022
dc.date.none.fl_str_mv 2022-09-06T22:42:19Z
2022-01-26
2022-01-26T00:00:00Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
dc.type.driver.fl_str_mv info:eu-repo/semantics/article
format article
status_str publishedVersion
dc.identifier.uri.fl_str_mv http://hdl.handle.net/10362/143550
url http://hdl.handle.net/10362/143550
dc.language.iso.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv 2077-1312
PURE: 46288061
https://doi.org/10.3390/jmse10020160
dc.rights.driver.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
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application/pdf
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instacron:RCAAP
instname_str Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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reponame_str Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
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repository.name.fl_str_mv Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos) - Agência para a Sociedade do Conhecimento (UMIC) - FCT - Sociedade da Informação
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