The morphology of the digestive tract and respiratory organs of the holothurian Cladolabes schmeltzii (Holothuroidea, Dendrochirotida)

Kamenev, Ya.O.; Dolmatov, Igor Yu.; Frolova, Lidia T.; Khang, Nguyen An

doi:10.1016/j.tice.2012.10.002

Cited by 21 publications

(26 citation statements)

References 36 publications

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“…Feral y Massin (1982), mencionan que es confusa la presencia de sinapsis y cilios en el epitelio digestivo en esta zona y en el estómago, pues mientras en unas especies se ha demostrado (H. tubulosa), en otras no es evidente (Stichopus japonicus, Leptosynapta galliennel). Kamenev et al (2013), describen para Cladolabes schmeltzii que las células epiteliales están conectadas mediante desmosomas, septas y estructuras a manera de "remache" (rivet-like structures). En este estudio se identificaron hemidesmosomas, estructuras similares a las encontradas para equinodermos por Green, Bergquist, y Bullivant (1979), Frolova y Dolmatov (2010), y Kamenev et al (2013).…”

Section: Resultsunclassified

“…Kamenev et al (2013), describen para Cladolabes schmeltzii que las células epiteliales están conectadas mediante desmosomas, septas y estructuras a manera de "remache" (rivet-like structures). En este estudio se identificaron hemidesmosomas, estructuras similares a las encontradas para equinodermos por Green, Bergquist, y Bullivant (1979), Frolova y Dolmatov (2010), y Kamenev et al (2013).…”

Section: Resultsunclassified

“…Una de las características interesantes encontradas fue la presencia de estómago en las tres especies, lo cual contrasta con la ausencia del mismo reportada en Holothuria glaberrima, Cladolabes schmeltzii, y Neostichopus grammatus donde no se evidencia la figura macroscópica de un estómago, sin embargo, a nivel histológico se observa su organización tisular (Foster & Hodgson, 1996;García-Arraras, 1998;Kamenev et al, 2013).…”

Section: Resultsunclassified

“…Se cree que interviene en las contracciones del tubo digestivo o en su regeneración. Algunos autores han descrito que el epitelio tiene funciones en el transporte y almacenamiento de nutrientes, la excreción de productos, el intercambio gaseoso y sobre la respuesta inmune (Warnau, Temara, Ameye, & Jangoux, 1998;Kamenev et al, 2013). Según García-Arrarás y Greenberg (2001), otros autores han manifiestado que el núme-ro y tamaño de este tejido, va disminuyendo en dirección antero-posterior con respecto al animal, como se confirmó en este estudio, y que la información sobre su origen y función aún no está dilucidada, por lo que se deben realizar mayores estudios sobre la naturaleza neuroquímica del mismo.…”

Section: Resultsunclassified

“…El sistema digestivo de los pepinos de mar suscita un interés particular por su función y la capacidad de regeneración del mismo; su morfología es muy variable, según el régimen alimenticio y el tipo de hábitat que ocupan (Feral & Massin, 1982). A pesar de la importancia que representa este órgano, su estructura y función ha sido poco estudiada (Feral & Massin, 1982;Foster & Hodgson 1996;Mashanov & Dolmatov, 2001;Mashanov, Frolova, & Dolmatov, 2004;Kamenev, Dolmatov, Frolova, & Nguyen, 2013). El conocimiento de la morfología es fundamental para entender la nutrición y sus aspectos ecológicos, fisiológi-cos y sus aplicaciones en la acuicultura.…”

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Histology of the digestive tract of three species of sea cucumber Isostichopus badionotus, Stichopus sp. and Stichopus hermanni (Aspidochirotida: Stichopodidae).

Vergara

Rodríguez

2015

RBT

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Histology of the digestive tract of three species of sea cucumber Isostichopus badionotus, Isostichopus sp. and Stichopus hermanni (Aspidochirotida: Stichopodidae). Sea cucumbers have an important ecological role in the marine environment because they are able to process organic and inorganic matter, which contributes to the oxygenation and energy transfer in the ecosystem. In general, there is a lack of knowledge on the basic morphology of native species of sea cucumber and the function of vital organs. The aim of this study was to describe the histology of the digestive tract (DT) of three species of holothuroids from Rodadero Bay, Colombia. Thirty specimens of Isostichopus badionotus, Isostichopus sp. and Stichopus hermanni were obtained and sacrificed by hypothermia. In the laboratory, sections of foregut, midgut and hindgut were obtained and fixed in formalin (10%) for later conventional histological processes; besides, some samples were fixed in glutaraldehyde (3%) for their inclusion in resins and studies in high resolution and electron microscopy. For the studied species, the DT is long, folded, and is distributed in the coelomic cavity; it has at least twice the length of the sea cucumber body. The DT presents villi lined by a columnar pseudostratified ciliated epithelium, which rests on a basement membrane and a layer of collagen fibers. Four types of cells were identified: coelocmocytes, brown cells, enterocytes and mucous cells, and the spicules were evident throughout the digestive tract tissue. Light microscopy showed elongated inclusions of calcareous formation located essentially in the hindgut, "the psamoma bodies". We observed granular mucous cells with an apical surface with numerous microvilli. The histology of the DT of I. badionotus, Isostichopus sp. and S. hermanni were found to be similar, but we found differences (p<0.05) in the thickness of the intestinal submucosa tissue, which can be tied to specific feeding habits of each species. Characterization of the morphohistology of the digestive tract of sea cucumber is a useful tool to understand their feeding physiology. Rev. Biol. Trop. 63 (4): 1021-1033. Epub 2015 December 01.

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Histology of the digestive tract of three species of sea cucumber Isostichopus badionotus, Stichopus sp. and Stichopus hermanni (Aspidochirotida: Stichopodidae).

Vergara

Rodríguez

2015

RBT

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

Kamenev

Dolmatov

2015

Microscopy Res & Technique

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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.

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Anterior regeneration after fission in the holothurianCladolabes schmeltzii(Dendrochirotida: Holothuroidea)

Kamenev

Dolmatov

2016

Microsc. Res. Tech.

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The regeneration of the anterior portion of the body after fission was studied in the holothurian Cladolabes schmeltzii using electron microscopy methods. Following fission, the posterior portion of the digestive tube, cloaca, and respiratory trees remain in the posterior fragment of the body. The regeneration comprises five stages. In the first stage, connective-tissue thickening (an anlage of the aquapharyngeal bulb) occurs on the anterior end between the torn-off ends of the ambulacra. Most of the lost anterior organs developed in the second and third stages. The structures of water-vascular system and nerve ring form through dedifferentiation, proliferation, and migration of cells of the radial water-vascular canals and the radial nerve cords, correspondently. The lost digestive system portion is restored through the formation and merging of two anlagen. The digestive epithelium of the esophagus and pharynx develops from lining cells of microcavities near the central portion of the connective-tissue thickening, which probably migrate from the epidermis. The second gut anlage develops through transformation of the anterior gut remnant portion. The enterocytes partly dedifferentiate, but the epithelium retains integrity. The gut anlage grows down the mesentery and joins the regenerating aquapharyngeal bulb. In the fourth and fifth stages, all lost organs are formed and have nearly normal structure. The regeneration was concluded to occur through morphallactic rearrangements of the remaining parts of organs. Epithelial morphogenesis is the key development mechanism of the digestive, water-vascular, and nervous systems.

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The morphology of the digestive tract and respiratory organs of the holothurian Cladolabes schmeltzii (Holothuroidea, Dendrochirotida)

Cited by 21 publications

References 36 publications

Histology of the digestive tract of three species of sea cucumber Isostichopus badionotus, Stichopus sp. and Stichopus hermanni (Aspidochirotida: Stichopodidae).

Histology of the digestive tract of three species of sea cucumber Isostichopus badionotus, Stichopus sp. and Stichopus hermanni (Aspidochirotida: Stichopodidae).

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

Anterior regeneration after fission in the holothurianCladolabes schmeltzii(Dendrochirotida: Holothuroidea)

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