Function-Related Structural Characters and Their Modifications in the Hindgut Epithelium of Two Terrestrial Isopods, &lt;i&gt;Armadillidium vulgare &lt;/i&gt;and &lt;i&gt;Oniscus asellus&lt;/i&gt;

Coruzzi, Laura; Witkus, R.; Vernon, G. M.

doi:10.1159/000163151

Cited by 3 publications

(5 citation statements)

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“…In the papillate region both the apical and the basal surfaces of epithelial cells are greatly amplified and associated with mitochondria. This indicates intensive material exchange with both the hindgut lumen and the haemocoel, which is consistent with transepithelial transport of ions and water in the papillate region (Vernon et al 1974, Coruzzi et al 1982, Palackal et al 1984). Transepithelial transport of ions and water in the papillate region can drive osmoregulatory processes, such as ion sequestration in the hindgut during dehydration (Wright et al 1997) or salt excretion with faeces in supralittoral and littoral genera Ligia and Tylos (Wright et al 2003).…”

Section: Discussionsupporting

confidence: 58%

“…Posteriorly directed cuticular spines are present at the surface of epicuticle (Vernon et al 1974, Palackal et al 1984, Storch and Štrus 1989, Mrak et al 2015). The main ultrastructural characteristics of hindgut epithelial cells are the extensively infolded apical and basal plasma membranes, numerous mitochondria associated with membrane infoldings, abundant apico-basally oriented microtubules, and extensive septate junctions (Vernon et al 1974, Coruzzi et al 1982, Palackal et al 1984, Storch and Štrus 1989). Previous ultrastructural studies have provided knowledge concerning the general ultrastructure of hindgut epithelial cells in isopods.…”

Section: Introductionmentioning

confidence: 99%

“…The epithelium of the anterior chamber was reported to function in the absorption of food material in addition to the hepatopancreas, which represents the main site of food absorption (Hryniewiecka-Szyfter and Storch 1986, Hames and Hopkin 1989). Extensively infolded apical and basal plasma membranes associated with numerous mitochondria, abundant microtubular network and extensive septate junctions indicate the involvement of papillate region epithelium in ion and water transport and thus in osmoregulation (Vernon et al 1974, Coruzzi et al 1982, Palackal et al 1984). Ultracytochemical localisation of Na + /K + -ATPase activity in the hindgut of Armadilloofficinalis has shown Na + /K + -ATPase activity in the apical or basolateral plasma membrane infoldings (Warburg and Rosenberg 1989).…”

Section: Introductionmentioning

confidence: 99%

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Comparative ultrastructure of cells and cuticle in the anterior chamber and papillate region of Porcellio scaber (Crustacea, Isopoda) hindgut

Bogataj¹,

Praznik²,

Mrak³

et al. 2018

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Isopod hindgut consists of two anatomical and functional parts, the anterior chamber, and the papillate region. This study provides a detailed ultrastructural comparison of epithelial cells in the anterior chamber and the papillate region with focus on cuticle ultrastructure, apical and basal plasma membrane labyrinths, and cell junctions. Na+/K+-ATPase activity in the hindgut epithelial cells was demonstrated by cytochemical localisation. The main difference in cuticle ultrastructure is in the thickness of epicuticle which is almost as thick as the procuticle in the papillate region and only about one sixth of the thickness of procuticle in the anterior chamber. The apical plasma membrane in both hindgut regions forms an apical plasma membrane labyrinth of cytoplasmic strands and extracellular spaces. In the papillate region the membranous infoldings are deeper and the extracellular spaces are wider. The basal plasma membrane is extensively infolded and associated with numerous mitochondria in the papillate region, while it forms relatively scarce basal infoldings in the anterior chamber. The junctional complex in both hindgut regions consists of adherens and septate junctions. Septate junctions are more extensive in the papillate region. Na+/K+-ATPase was located mostly in the apical plasma membranes in both hindgut regions. The ultrastructural features of hindgut cuticle are discussed in comparison to exoskeletal cuticle and to cuticles of other arthropod transporting epithelia from the perspective of their mechanical properties and permeability. The morphology of apical and basal plasma membranes and localisation of Na+/K+-ATPase are compared with other arthropod-transporting epithelia according to different functions of the anterior chamber and the papillate region.

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Section: Discussionsupporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Comparative ultrastructure of cells and cuticle in the anterior chamber and papillate region of Porcellio scaber (Crustacea, Isopoda) hindgut

Bogataj¹,

Praznik²,

Mrak³

et al. 2018

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“…No obvious histological differentiation of the cells in the hind-gut compared to rest of gut was found (confirming similar results in tyroglyphids -Oboussier 1939). The endodermic hind-gut epithelium appeared and behaved just like the mid-gut epithelium-there being no evidence of hind-gut specialisation as found in terrestrial isopods (Coruzzi et al 1982) either. A very thin flat epithelium, confirming its partial endodermic origin (Legendre 1968) was present in the rectal vesicle (as in the rectum of tyroglyphids -Oboussier 1939).…”

Section: Resultssupporting

confidence: 80%

The gut epithelium from feeding to fasting in the predatory soil mite Pergamasus longicornis (Mesostigmata: Parasitidae): one tissue, two roles

Bowman

2019

Exp Appl Acarol

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A review of acarine gut physiology based on published narratives dispersed over the historical international literature is given. Then, in an experimental study of the free-living predatory soil mite Pergamasus longicornis (Berlese), quantitative micro-anatomical changes in the gut epithelium are critically assessed from a temporal series of histological sections during and after feeding on larval dipteran prey. An argued functional synthesis based upon comparative kinetics is offered for verification in other mesostigmatids. Midand hind-gut epithelia cell types interconvert in a rational way dependent upon the physical consequences of ingestion, absorption and egestion. The fasted transitional pseudostratified epithelium rapidly becomes first squamous on prey ingestion (by stretching), then columnar during digestion before confirmed partial disintegration (gut 'lumenation') during egestion back to a pseudo-stratified state. Exponential processes within the mid-and endodermic hind-gut exhibit 'stiff' dynamics. Cells expand rapidly (t 1∕2 = 22.9-49.5 min) and vacuolate quickly (t 1∕2 = 1.1 h). Cells shrink very slowly (t 1∕2 = 4.9 days) and devacuolate gently (t 1∕2 = 1.0-1.7 days). Egestive cellular degeneration has an initial t 1∕2 = 7.7 h. Digestion appears to be triggered by maximum gut expansion-estimated at 10 min post start of feeding. Synchrony with changes in gut lumen contents suggests common changes in physiological function over time for the cells as a whole tightly-coupled epithelium. Distinct in architecture as a tissue over time the various constituent cell types appear functionally the same. Functional phases are: early fluid transportation (0-1 h) and extracellular activity (10-90 min); through rising food absorption (10 min to > 1 day); to slow intracellular meal processing and degenerative egestive waste material production (1 to > 12 days) much as in ticks. The same epithelium is both absorptive and degenerative in role. The switch in predominant physiology begins 4 h after the start of feeding. Two separate pulses of clavate cells appear to be a mechanism to facilitate transport by increasing epithelial surface area in contact with the lumen. Free-floating cells may augment early extracellular lumenal digestion. Possible evidence for salivary enzyme alkaline-related extra-corporeal digestion was found. Giant mycetome-like cells were found embedded in the mid-gut wall. Anteriorly, the mid-gut behaves like a temporally expendable food processing tissue and minor long-term resistive store. Posteriorly the mid-gut behaves like a major assimilative/ catabolic tissue and 'last-out' food depot (i.e., a 'hepatopancreas' function) allowing the mite to resist starvation for up to 3.5 weeks after a single meal. A 'conveyor-belt' wave Extended author information available on the last page of the article Research Council grant B/77307818 at Liverpool John Moores University. Thanks go to Susan Bjornson (then at University of Alberta, Canada) for advice on invertebrate sporozoans and Don E Johnston (Ohio Sta...

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“…The fine structure of the hepatopancreas and hindgut of several species of terrestrial isopods has been described extensively by several authors and will not be covered in detail in this paper (Nusbaum-Hilarowitz, 1917;Patane, 1934;Chandy, 1939;Cicero, 1964;Smith, Witkus & Grillo, 1969;Donadey, 1969;Witkus, Grillo & Smith, 1969;Clifford & Witkus, 1971;Donadey & Besse, 1972;Vernon, Herold & Witkus, 1974;Holdich & Mayes, 1975;Herold, Goggins, Witkus & Vernon, 1976;Coruzzi, Witkus & Vernon, 1982;Hopkin & Martin, 19826, 1984;Bettica, Shay, Vernon & Witkus, 1984;Palackal et al, 1984;Storch, 1984;Strus, Burkhardt & Storch, 1985).…”

mentioning

confidence: 99%

The structure and function of the digestive system of terrestrial isopods

Hames

Hopkin

1989

Journal of Zoology

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With 7 plates and 4 figures in the text)The functional morphology of the digestive system of terrestrial isopods (woodlice) has been investigated. Observations have been made on live juveniles of Oniscus usellus and Porcellio scuber in which some digestive processes can be observed directly through the cuticle. The fine structure of the foregut of juveniles and adults of these two species has been studied by light microscopy and scanning and transmission electron microscopy. The passage of coloured dyes and colloidal gold through the digestive system has also been followed.The digestive system of Oniscus asellus and Porcellio scuber is divided into five regions. The foregut (l), and the anterior chamber (2), papillate region (3) and rectum (4) of the hindgut, are ectodermal in origin and lined with cuticle. The hepatopancreas (5), which opens into the foregut, consists of four blind-ending tubules which are endodermal in origin and not lined with cuticle. A powerful muscular sphincter is present between the papillate region and the rectum. There is no peritrophic membrane in the lumen of either the hepatopancreas or the hindgut.Fragments of food pass via the oesophagus to the proventriculus of the foregut where they are briefly masticated before passing rapidly into the anterior chamber of the hindgut. During this process, the food is mixed with secretions derived from the hepatopancreas. The anterior chamber possesses a pair of dorsal channels formed from a typhlosole and lateral infoldings of the gut wall. When the hindgut is full of food, contraction of muscles surrounding the gut forces liquids and fine food particles back into the foregut via the typhlosole channels which open at the junction of the anterior chamber and papillate region. This material, which contains fluids derived from the hepatopancreas, and products of digestion, is filtered in the foregut and passed into the lumen of the hepatopancreas where further digestion, and absorption of nutrients, takes place. The hepatopancreas may secrete these fluids back on to the food in the anterior chamber and receive products of digestion uiu the typhlosole channels several times during a digestive cycle. The lumen of the foregut, hindgut and hepatopancreas often contains a dense population of microorganisms which may be involved in digestion. Residual material in the hindgut passes eventually into the rectum where faecal pellets are compacted before they are voided.The ability of terrestrial isopods to recycle and retain fluids within the digestive system, by the development of the typhlosole channels (which are not present in marine isopods), may have been a major contributory factor in their successful transition from water to land.

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Function-Related Structural Characters and Their Modifications in the Hindgut Epithelium of Two Terrestrial Isopods, <i>Armadillidium vulgare </i>and <i>Oniscus asellus</i>

Cited by 3 publications

References 23 publications

Comparative ultrastructure of cells and cuticle in the anterior chamber and papillate region of Porcellio scaber (Crustacea, Isopoda) hindgut

Comparative ultrastructure of cells and cuticle in the anterior chamber and papillate region of Porcellio scaber (Crustacea, Isopoda) hindgut

The gut epithelium from feeding to fasting in the predatory soil mite Pergamasus longicornis (Mesostigmata: Parasitidae): one tissue, two roles

The structure and function of the digestive system of terrestrial isopods

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