Structural and functional peculiarities of the digestive system of Cucumaria frondosa (Echinodermata: Holothuroidea)

Filimonova, G. F.; Tokin, I.B.

doi:10.1007/bf00395601

Cited by 15 publications

(11 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Its absence is likely compensated by the 2DP. The enterocytes of echinoderms are believed to be multifunctional (Feral and Massin, ; Filimonova and Tokin, ). Moreover, the AP and 2DP of the guts of holothurians perform similar functions, consisting mainly of absorption and membrane‐localized and intracellular digestion (Eliseikina and Leibson, ; Feral, ; Kamenev et al, ; Mashanov and Dolmatov, ).…”

Section: Discussionmentioning

confidence: 99%

Posterior regeneration following fission in the holothurian Cladolabes schmeltzii (Dendrochirotida: Holothuroidea)

Kamenev

Dolmatov

2015

Microscopy Res & Technique

View full text Add to dashboard Cite

The regeneration of the posterior portion of the body after fission was studied in the holothurian Cladolabes schmeltzii using electron microscopy methods. Following fission, the aquapharyngeal complex, gonad and anterior portion of the first descending part of the intestine remain in the anterior fragment of the body. The entire regeneration process is divided into five stages. In the first three stages, the digestive system and damaged ends of the longitudinal muscle bands regenerate. The intestine is formed through the rearrangement and growth of the remaining portion of the first descending part of the intestine. The gut anlage grows down the mesentery and joins the regenerating cloaca. The cloaca is formed from two sources: its posterior portion appears as a result of immersion of the epidermis, while the anterior portion develops from the terminal segment of the growing intestine. Regeneration of muscles progresses in the typical manner for echinoderms: through immersion and myogenic transformation of the coelomic epithelium. Respiratory trees appear in animals when the growth of the external part of the body has begun (fourth stage). They are formed as an outgrowth of the dorsal wall of the anterior portion of the cloaca. It was concluded that regeneration of the posterior portion of the body in the holothurian C. schmeltzii following fission is realized through morphallactic rearrangements of the remaining parts of organs. The main mechanism through which the digestive, respiratory, and contractile systems are formed is epithelial morphogenesis.

show abstract

Section: Discussionmentioning

confidence: 99%

Posterior regeneration following fission in the holothurian Cladolabes schmeltzii (Dendrochirotida: Holothuroidea)

Kamenev

Dolmatov

2015

Microscopy Res & Technique

View full text Add to dashboard Cite

show abstract

“…The cells of the luminal epithelium of the respiratory tree contain cytoplasmic vesicles, phagosomes, and microvilli (Doyle & McNiell ; Spirina & Dolmatov , ; Liu et al. ; Dolmatov & Ginanova ), structural features that they share with cells that line the definitive digestive system (Filimonova & Tokin ; Féral & Massin ; Mashanov & Dolmatov ). These common cellular elements indicate a capacity to assimilate organic solutes.…”

Section: Discussionmentioning

confidence: 99%

The anus as a second mouth: anal suspension feeding by an oral deposit‐feeding sea cucumber

Jaeckle

Strathmann

2013

Invertebrate Biology

View full text Add to dashboard Cite

Respiratory trees of holothurians are blind‐ended evaginations of the posterior digestive system that are rhythmically inflated with seawater via the anus, and are considered to have respiratory and excretory functions. We tested the assimilatory capability of the respiratory tree epithelium by exposing adults of the oral deposit‐feeding aspidochirotid sea cucumber Parastichopus californicus to (1) 14C‐labeled unicellular algae and (2) iron‐containing macromolecules, and then following the distribution of the labels in various body regions. The abundance of the 14C (nmol 14C g wet weight−1) varied among body regions. The majority of the label was associated with the respiratory trees. The next greatest concentration was in the rete mirabile of the hemal system. The amount of 14C within samples of the anterior digestive system, posterior digestive system, and body wall muscle at each sampling time was lower than that of the respiratory trees. The presence and abundance of the 14C label in samples of the hemal system and the physical association between the respiratory tree and the rete mirabile suggest initial uptake by the respiratory tree and subsequent transfer to the hemal system. The iron label from the protein ferritin and the polysaccharide iron dextran entered cells of the respiratory tree luminal epithelium. The presence of the iron label in mesenchyme cells within the connective tissue compartment of the respiratory trees exposed to ferritin further suggests directional transfer of materials. Holothurians with respiratory trees are nutritionally bipolar; the anus serves as a second mouth.

show abstract

“…The holothurian foregut has been described as the site of intracellular digestion and mucoid biosynthesis, whereas absorption and metabolite transport are believed to occur to a greater extent in the hindgut (7,17,21). In the abyssal holothurians examined in this study, an important component of the ingested bacterial population appears to survive the initial digestive processes of the foregut and to flourish in the hindgut (Fig.…”

Section: Discussionmentioning

confidence: 99%

Barophilic Bacteria Associated with Digestive Tracts of Abyssal Holothurians

Deming

Colwell

1982

Appl Environ Microbiol

View full text Add to dashboard Cite

Abyssal holothurians and sediment samples were collected at depths of 4,430 to 4,850 m in the Demerara abyssal plain. Bacterial concentrations in progressive sections of the holothurian digestive tract, as well as in surrounding surface sediments, were determined by epifluorescence microscopy. Total bacterial counts in sediments recently ingested by the animals were 1.5to 3-fold higher than in surrounding sediments at the deepest station. Lowest counts were observed consistently in the foregut, where the digestive processes of the holothurian are believed to occur. In most animals, counts increased 3to 10-fold in the hindgut. Microbial activity at 3°C and in situ and atmospheric pressure were determined for gut and sediment samples by measuring the utilization of ['4C]glu

show abstract

Structural and functional peculiarities of the digestive system of Cucumaria frondosa (Echinodermata: Holothuroidea)

Cited by 15 publications

References 9 publications

Posterior regeneration following fission in the holothurian Cladolabes schmeltzii (Dendrochirotida: Holothuroidea)

Posterior regeneration following fission in the holothurian Cladolabes schmeltzii (Dendrochirotida: Holothuroidea)

The anus as a second mouth: anal suspension feeding by an oral deposit‐feeding sea cucumber

Barophilic Bacteria Associated with Digestive Tracts of Abyssal Holothurians

Contact Info

Product

Resources

About