Ultrastructure of the tegument of Saccocoelioides godoyi

Cohen, Simone Chinicz; Kohn, Anna; Baptista-Farias, Maria de Fatima Diniz

doi:10.1079/joh200040

Cited by 7 publications

(3 citation statements)

References 21 publications

(26 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Ultrastructural observations on digenean tegumental spines are numerous (e.g. Erasmus 1967;Fukuda et al 1987;Cohen et al 1996Cohen et al , 2001Jamjoom and Shalaby 2006;Poddubnaya et al 2010) and show that their shape, size and distribution vary considerably. Our SEM observations show that the spines within the suckers of C. callorhynchi are simple, short, straight and single-pointed.…”

Section: Discussionmentioning

confidence: 99%

The surface topography of Callorhynchocotyle callorhynchi (Manter, 1955) (Monogenea: Hexabothriidae), a parasite of the holocephalan fish Callorhinchus capensis

2015

View full text Add to dashboard Cite

A scanning electron microscopical study, incorporating some transmission electron microscopical observations, was undertaken on the surface topography of the gill parasite Callorhynchocotyle callorhynchi (Manter, 1955) (Monogenea: Hexabothriidae) from the Cape elephant fish Callorhinchus capensis (Holocephali) off the western coast of South Africa. The study revealed the presence of several new characteristics for this species. These include the presence of regularly distributed, knob-shaped projections on the surface of the haptor, haptoral appendix and sucker peduncles measuring 0.2 μm and in concentrations of approximately 100 per 10 μm(2) and the existence of a ridge which bisects each sucker lumen, forming two different loculi. We also report, for the first time for any monogenean, the presence of 'true spines'; these occur on the luminal surface of the haptoral suckers and have all of the characteristics of the tegumental spines of digeneans, i.e. they are situated within the distal syncytial tegumental cytoplasm, rest on the basal plasma membrane, have a uniform structure and are covered apically by the tegumental surface plasma membrane. These spines are simple, straight and single-pointed. Under the scanning electron microscopy (SEM), within an area of 20 μm in diameter, 23 such spines were counted, but their concentration and arrangement varies in different regions of the sucker. At their base, they measure about 1.5 μm in width and reach approximately 2 μm in height above the general level of the tegument, but transmission electron microscopy (TEM) measurements of an entire spine indicate that they may reach 3 μm in total length. The presence of spines, possessing similar morphological characteristics in both basal polyopisthocotylean monogeneans and digeneans, represents another characteristic which may prove useful in understanding the evolutionary relationships within the Neodermata.

show abstract

Section: Discussionmentioning

confidence: 99%

The surface topography of Callorhynchocotyle callorhynchi (Manter, 1955) (Monogenea: Hexabothriidae), a parasite of the holocephalan fish Callorhinchus capensis

2015

View full text Add to dashboard Cite

show abstract

“…Some morphological and taxonomical data based on these materials have already been published by Baptista-Farias et al (2001), Cohen and Kohn (2008a, b), Cohen and Kohn (2009) Cohen et al (2001), Fernandes and Kohn (2001), Kohn and Fernandes (1994;2006), Kohn et al (1995;1999;2000;2003), Lopes et al (2011) and Moravec et al (1990;1992a, b, c;1993 a, b, c;1994 a, b;.…”

Section: Resultsmentioning

confidence: 89%

Helminths of freshwater fishes in the reservoir of the Hydroelectric Power Station of Itaipu, Paraná, Brazil

Kohn¹,

Moravec²,

Cohen³

et al. 2011

View full text Add to dashboard Cite

This study presents results from several expeditions in 1985, 1991-1995 and 2003 to the Medium Paraná River in the section that begins below the Itaipu Dam and ends at the trinational border of Brazil, Argentina and Paraguay, in the lotic and lentic zones of the reservoir of the Hydroelectric Power Station of “Itaipu Binacional” (localities Foz do Iguaçu, Santa Helena and Guaira). Ninety-eight species of freshwater fishes belonging to 22 families were examined for helminths. A host-parasite list based on Acanthocephala, Cestoda, Digenea, Monogenea and Nematoda collected from the region in question is provided. New host records are presented for Digenea and Nematoda. The Monogenea and Acanthocephala are being studied and will be published in a later paper, but are referred in the host-parasite list, in order to demonstrate the parasitism in the fishes of the reservoir. The results are compared with those presented by other authors from the Upper Paraná River.

show abstract

“…Taking into consideration the ultrastructural data available on the morphology of the hard structures of Platyhelminthes, a true "spine" is characterised by (a) its location within the epithelial layer, (b) their basis resting on the basal membrane, (c) their apices projecting beyond the body surface and (d) coverage by the surface plasma membrane. As a rule, "spines" are either homogeneously crystalloid (like the digenean spines) (Erasmus 1967;Threadgold 1975;Fukuda et al 1987;Cohen et al 2001) or built up from homogeneous material with dense fibres (like monogenean squamodisc spines) (Shaw 1981). In contrast, scolex hooks of postlarval cestode stages arise de novo within the neodermis (Mount 1970), whereas posterior hooks of Monogenea and larval Cestodes (lycophora, oncosphera, coracidium) are formed within special cells, the oncoblasts (Lyons 1966;Kearn 1968;Xylander 1991).…”

Section: Terminology Of Gyroctyle Scleritesmentioning

confidence: 99%

Ultrastructure of the neodermal sclerites of Gyrocotyle urna Grube and Wagener, 1852 (Gyrocotylidea, Cestoda)

Xylander

Poddubnaya

2009

Parasitol Res

View full text Add to dashboard Cite

Body sclerites of Gyrocotyle urna Grube and Wagener, 1852, parasites of Chimaera monstrosa L., were studied by transmission electron microscopy. Each sclerite consists of ten to 15 concentric layers varying in electron density and thickness. The sclerites insert in pockets whose epithelia are continuous with the body neodermis but are 14 times thinner. The pocket neodermis bears surface projections with an inner electron-dense cylinder and a small electron-dense cap at their tip. It is surrounded by a well-elaborated basement lamina and bundles of musculature; the perikarya of this part of the neodermis lie underneath the basement membrane. The luminal plasma membrane of the pockets is covered by a coat originating from vesicles and dense bodies most probably discharged from the pocket neodermis, supporting the assumption that the deposition of this material builds up the sclerites. Therefore, sclerites are derivatives of the neodermis. With regard to their ultrastructure, sclerites resemble the calcareous corpuscles of other cestode taxa. They represent a useful phylogenetic character and are an autapomorphy of the Gyrocotylidea.

show abstract

Ultrastructure of the tegument of Saccocoelioides godoyi

Cited by 7 publications

References 21 publications

The surface topography of Callorhynchocotyle callorhynchi (Manter, 1955) (Monogenea: Hexabothriidae), a parasite of the holocephalan fish Callorhinchus capensis

The surface topography of Callorhynchocotyle callorhynchi (Manter, 1955) (Monogenea: Hexabothriidae), a parasite of the holocephalan fish Callorhinchus capensis

Helminths of freshwater fishes in the reservoir of the Hydroelectric Power Station of Itaipu, Paraná, Brazil

Ultrastructure of the neodermal sclerites of Gyrocotyle urna Grube and Wagener, 1852 (Gyrocotylidea, Cestoda)

Contact Info

Product

Resources

About