The ultrastructure and histology of the perinotal epidermis and defensive glands of two species of Onchidella (Gastropoda: Pulmonata)

dc.contributor.authorPinchuck, Shirley C.
dc.contributor.authorHodgson, Alan C.
dc.date.accessioned2012-08-15T19:30:31Z
dc.date.available2012-08-15T19:30:31Z
dc.date.issued2010
dc.description.abstractHistology and electron microscopy were used to describe and compare the structure of the perinotal epidermis and defensive glands of two species of shell-less marine Systellommatophora, Onchidella capensis and Onchidella hildae (Onchidiidae). The notum of both species is composed of a layer of epithelial and goblet cells covered by a multi-layered cuticle. Large perinotal multi-cellular glands, that produce thick white sticky mucus when irritated, are located within the sub-epidermal tissue. The glands are composed of several types of large secretory cell filled with products that stain for acidic, sulphated and neutral mucins, and some irregularly shaped support cells that surround a central lumen. The products of the secretory cells are produced by organelles that are basal in position. The entire gland is surrounded by a well-developed capsule of smooth muscle and collagen, and in addition smooth muscle surrounds the cells within the glands. Based on the size of the gland cells, their staining properties, and the appearance of their stored secretions at the transmission electron microscope level, five different types of secretory cells were identified in O. capensis and four in O. hildae. The products of these cells, which are released by holocrine secretion, presumably mix in the lumen of the duct as they are forced out by contraction of the smooth muscle. The structural similarity of these glands to those of siphonariids, suggest that they have a common ancestry.
dc.format.extent105–115
dc.identifier0040-8166
dc.identifier.citationPinchuck, Shirley C. and Hodgson, Alan C. 2010. "<a href="https://repository.si.edu/handle/10088/18775">The ultrastructure and histology of the perinotal epidermis and defensive glands of two species of Onchidella (Gastropoda: Pulmonata)</a>." <em>Tissue and Cell</em>, 42, (2) 105–115. <a href="https://doi.org/10.1016/j.tice.2010.02.001">https://doi.org/10.1016/j.tice.2010.02.001</a>.
dc.identifier.issn0040-8166
dc.identifier.urihttp://hdl.handle.net/10088/18775
dc.relation.ispartofTissue and Cell 42 (2)
dc.titleThe ultrastructure and histology of the perinotal epidermis and defensive glands of two species of Onchidella (Gastropoda: Pulmonata)
dc.typearticle
sro.description.unitSTRI
sro.identifier.doi10.1016/j.tice.2010.02.001
sro.identifier.itemID110575
sro.identifier.refworksID70332
sro.identifier.urlhttps://repository.si.edu/handle/10088/18775

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