Studies of Parajulid Diplopods. No. II. The Micro-Anatomy of the Alimentary Canal of Parajulus impressus Say

Hefner, Robert A.

doi:10.2307/3222054

Cited by 9 publications

(3 citation statements)

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“…In diplopods, the mode of secretion can be apocrine, as observed in the present study and described by Fontanetti et al (2001) for the species P. setiger, by Fantazzini et al (2002) for R. padbergi, or merocrine as observed by Hefner (1929) for Parajulus impressus. The latter author also suggested that in other millipedes the type of secretion may be holocrine.…”

Section: Discussionsupporting

confidence: 83%

Midgut of the diplopod Urostreptus atrobrunneus: structure, function, and redefinition of hepatic cells

2017

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Diplopods are considered important macroarthropods the soil as part of its maintenance and balance. These animals usually do not occur in high densities, but population explosions caused by environmental disturbances, climate changes, and use of pesticides that eliminate possible competitors, have been reported. The millipede Urostreptus atrobrunneus Pierozzi and Fontanetti, 2006 have become a nuisance to humans in infestation sites in urban centers of the state of Sao Paulo, Brazil. As a contribution to the understanding of this potential pest, this study describes the histology, histochemistry, and ultrastructure of the U. atrobrunneus midgut, and presents the redefinition of hepatic cells somewhat controversial in the literature. The region of the midgut is characterized by the absence of a cuticular intima, and composed of a pseudostratified epithelium on a thick basal membrane, followed by a muscle layer, a layer of hepatic cells, lined by an external membrane. The morphology observed in U. atrobrunneus is similar to that reported for other species of diplopods. The hepatic cells have been previously described as randomly without forming a layer, however, the present results clearly demonstrate that these cells form a continuous layer over the whole midgut.Keywords: histology, histochemistry, ultrastructure, Diplopoda, digestive tract. Intestino médio do diplópodo Urostreptus atrobrunneus: estrutura, função e redefinição das células hepáticas ResumoDiplópodos são considerados importantes macro-artrópodes do solo, uma vez que participam de sua manutenção e equilíbrio. Comumente estes animais não apresentam população numerosa, porém há relatos de explosões populacionais ocasionadas por desequilíbrios ambientais, mudanças climáticas e utilização de pesticidas que eliminam possíveis competidores. O milípede Urostreptus atrobrunneus Pierozzi e Fontanetti, 2006, têm apresentado pontos de infestação em centros urbanos, do estado de São Paulo, Brasil, causando muitos transtornos à população humana. Com objetivo de contribuir para o conhecimento desta potencial praga, este trabalho apresenta a descrição histológica, histoquímica e ultra-estrutural do intestino médio do milípede U. atrobrunneus, bem como apresenta a redefinição das células hepáticas, um tanto controversa na literatura pertinente. A região do intestino médio é caracterizada pela ausência da íntima cuticular, sendo formado por um epitélio pseudoestratificado, apoiado por uma membrana basal espessa, seguido de uma camada muscular, uma camada de células hepáticas, revestido por uma membrana externa. A morfologia observada neste trabalho assemelha-se bastante com as descrições de outras espécies de diplópodos estudadas até o momento. As células hepáticas foram previamente descritas como dispostas aleatoriamente sem a formação de uma camada, contudo, os presentes resultados demonstram claramente que estas células formam uma camada contínua ao longo de todo o intestino médio.

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Section: Discussionsupporting

confidence: 83%

Midgut of the diplopod Urostreptus atrobrunneus: structure, function, and redefinition of hepatic cells

2017

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“…Despite their ecological importance, papers on the morphology of their alimentary tract are scarce and usually related to European and North American species (HEFNER, 1929;HOPKINS & READ, 1992;MILEY, 1930;NUNEZ & CRAWFORD, 1977). Recently some studies regarding two Neotropical species, Plusioporus setiger (Brolemann, 1901) and Rhinocricus padbergi Verhoeff, 1938 were conducted (FANTAZZINI et al, 1998(FANTAZZINI et al, , 2002FONTANETTI & CAMARGO-MATHIAS, 1997;FONTANETTI et al, 2001).…”

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confidence: 99%

Microspines in the pylorus of Pseudonannolene tricolor and Rhinocricus padbergi (Arthropoda, Diplopoda)

Miyoshi

Gabriel

Fantazzini

et al. 2005

Iheringia, Sér. Zool.

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ABSTRACT. The aim of this paper is to report the morphology and distribution of microspines in diplopods pylorus, as these are important structures present along the alimentary tract of arthropods. The morphology of the internal surface of the pylorus of Pseudonannolene tricolor Brolemann, 1901 and Rhinocricus padbergi Verhoeff, 1938 was analyzed by SEM. Pseudonannolene tricolor presents two morphologically distinct pyloric regions: anterior and posterior. The first region is characterized by the presence of thin microspines that increase in number and size towards the posterior portion; the second region presents smaller and triangular-shaped microspines distributed throughout small plates. The pylorus of R. padbergi does not present differentiated regions; the anterior portion is characterized by microspines grouped in plates that decrease in number and increase in size towards the ileum. KEYWORDS.Alimentary canal, hindgut, morphology, scanning microscopy. RESUMO. Microespinhos no piloro dePseudonannolene tricolor e Rhinocricus padbergi (Arthropoda, Diplopoda). Este trabalho relata a morfologia e distribuição de microespinhos no piloro de diplópodos, uma vez que estas são estruturas importantes presentes ao longo do trato digestório dos artrópodos. A morfologia da superfície interna do piloro de Pseudonannolene tricolor Brolemann, 1901 e Rhinocricus padbergi Verhoeff, 1938 foi analisada por meio de MEV. Pseudonannolene tricolor apresenta duas regiões pilóricas morfologicamente distintas: anterior e posterior. A primeira região caracteriza-se pela presença de finos microespinhos que aumentam em número e tamanho em direção a porção posterior; a segunda região apresenta microespinhos pequenos, de formato triangular, distribuído em pequenas placas. O piloro de R. padbergi não apresenta regiões diferenciadas; a porção anterior caracteriza-se por microespinhos agrupados em placas, os quais decrescem em número e aumentam em tamanho, em direção ao íleo.

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“…According to the descriptions given by Nunez and Crawford (1977), the presence of the acellular peritrophic membrane is well-established in the digestive tube of the class Diplopoda, although it was observed neither in the foregut of the species Ptyoiulus impressus, described by Hefner (1929), nor in the foregut and hindgut of Orthoporus omatus (Nunez and Crawford, 1977). More recently, studies on the Brazilian species P. setiger (Fontanetti and Camargo-Mathias, 1997) and R. padbergi (Eantazzini et al, 1998(Eantazzini et al, , 2002 bave demonstrated tbat tbe peritropbic membrane is present tbrougbout tbe alimentary canal in tbese species.…”

Section: Resultsmentioning

confidence: 95%

Structure and function of the foregut and salivary glands of the synanthropic diplopod Urostreptus atrobrunneus (Spirostreptidae)

Sousa

Fontanetti

2012

Animal Biol

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Diplopods are considered to be important macro-arthropods of the soil because they are involved in maintaining the balance of the ecosystem. Normally, they do not maintain a large population, but population explosions may occur due to environmental imbalances, climate changes and the use of pesticides that can eliminate possible competitors. The millipede Urostreptus atrobrunneus Pierozzi and Fontanetti, 2006 has infested sites in urban centers of Sao Paulo State, causing various probletns for the human population; tbe lack of knowledge of this millipede's biology has hindered efforts to efficiently control the infestation. Because of this lack of knowledge, this study aims to contribute to the understanding of this pest, describing the morphology of the foregut and salivary glands of tbe millipede U. atrobrunneus, and relating them to their respective functions by histological and histochetnical analyses.

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Studies of Parajulid Diplopods. No. II. The Micro-Anatomy of the Alimentary Canal of Parajulus impressus Say

Cited by 9 publications

References 0 publications

Midgut of the diplopod Urostreptus atrobrunneus: structure, function, and redefinition of hepatic cells

Midgut of the diplopod Urostreptus atrobrunneus: structure, function, and redefinition of hepatic cells

Microspines in the pylorus of Pseudonannolene tricolor and Rhinocricus padbergi (Arthropoda, Diplopoda)

Structure and function of the foregut and salivary glands of the synanthropic diplopod Urostreptus atrobrunneus (Spirostreptidae)

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