Structure and function of the female reproductive ducts of the fish blood-fluke<i>Aporocotyle simplex</i>Odhner, 1900 (Digenea: Sanguinicolidae)

Thulin, Jan

doi:10.1080/00364827.1982.10421338

Cited by 13 publications

(8 citation statements)

References 16 publications

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“…K¢ie (1982) also observed with SEM two uniciliate papillae either side of the cercarial mouth of the marine sanguinicolid Aporocotyle simplex; however, in contrast, the cilia of these papillae protrude from the tegumental surface. The only author to observe similar papillae to those described in this study was Thulin (1982), in the female genital atrium of adult A. simplex.…”

Section: Discussionsupporting

confidence: 80%

Ultrastructure of the digestive system of the cercaria of Sanguinicola inermis Plehn, 1905 (Digenea: Sanguinicolidae)

1994

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The digenean blood fluke Sanguinicola inermis and the family Sanguinicolidae have previously been described as apharyngeate and sucker-less. Examination of the digestive tract of the cercaria of S. inermis with transmission electron microscopy (TEM), however, has confirmed the presence of a well-developed and complex muscular region immediately adjacent to the sub-terminal mouth. The presence of this muscular region, which may be an oral sucker, emphasises the need for further ultrastructural studies on other members of the family. The adjacent oesophagus, composed of modified tegument, has distinct anterior and posterior regions. TEM shows that the surface of the posterior oesophagus is deeply folded and the apical cytoplasm and sunken cytons become filled with secretory granules, eventually forming a "secretory region" adjacent to the intestine. The dorsal, sac-like intestine is composed of a single layer of epithelial cells, the apical surface of which is drawn into shallow folds. Each cell contains numerous secretory granules, rough ER, and a single basal nucleus. The intestinal lumen, which contains electrondense striated bodies, is filled with fibrous material. Only two sensory oral papillae are associated with the digestive tract, positioned either side of the mouth opening and possibly acting as tango-, stretch-or pressure receptors. The papillae comprise several microtubules lying beneath the apical cytoplasm of the tegument within a nerve process, but there is no connection with the external body surface. The morphology of the alimentary canal of the S. inermis cercaria is discussed in relation to the functioning of the digestiv e system in preparation for establishment in the final host.

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Section: Discussionsupporting

confidence: 80%

Ultrastructure of the digestive system of the cercaria of Sanguinicola inermis Plehn, 1905 (Digenea: Sanguinicolidae)

1994

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“…More research has been carried out on the ultrastructure of the uterus of digeneans, including observations on the uterine wall of members of the larger two of the three digenean orders [Strigeida -Pharyngostomoides procyonis (Diplostomidae) (Grant et al 1977) and Aporocotyle simplex (Sanguinicolidae) (Thulin 1982); Plagiorchiida -Cryptocotyle lingua (Heterophyidae) (Rees 1979), Prosthodendrium ascidia (Lecithodendriidae) (Podvyaznaya 1990) and Allassogonoporus amphoraeformis (Gyrabascidae) (Podvyaznaya 2003)], which indicate that it is lined with epithelial cells bearing lamellae. The presence of intercellular junctions within the uterine epithelial lining of these digenean species has also been mentioned by all of the abovementioned authors.…”

Section: Discussionmentioning

confidence: 99%

Ultrastructural characteristics of the uterine epithelium of aspidogastrean and digenean trematodes

Poddubnaya

Levron

Gibson

2011

Acta Parasitologica

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The ultrastructure of the uterus proper of the aspidogastrean Aspidogaster limacoides Diesing, 1835 and two digenean species, Phyllodistomum angulatum Linstow, 1907 (Plagiorchiida, Gorgoderidae) and Azygia lucii (Müller, 1776) (Strigeida, Azygiidae), was examined by transmission electron microscopy (TEM). The uterine epithelial lining of these species is thin, except for the perinuclear region of the epithelial cells. Septate junctions occur between adjacent epithelial cells within the uterine wall. The luminal surface of the cells is elevated into microlamellae, which project into the uterine lumen and cover the entire epithelial lining. Basally the uterine epithelium is attached to a basal matrix, and its supporting layers of muscle fibres are weak and composed of scattered circular muscles. Despite the marked similarity in the ultrastructural pattern of the aspidogastrean and two digeneans studied, there is some degree of variation in the secretory activity of their uterine epithelium. The high level of vesicular exocytotic activity in the epithelial cytoplasm of A. lucii may be associated with differences in egg emission and the subsequent life cycle involving a non-ciliated, non-swimming and non-free-living miracidium, as opposed to the free-swimming miracidium of P. angulatum. The similar nature of the uterine epithelium in all three species studied represents an ultrastructural marker possibly supporting a close phylogenetic relationship between the Aspidogastrea and the Digenea.

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“…The presence of saturated lipid droplets has been also indicated for another gorgoderid species, G. vitelliloba (see Irwin and Maguire 1979), and for the microphallids Maritrema linguilla and M. feliui (see Hendow andJames 1989, Świderski et al 2011). However, in a range of other digeneans unsaturated lipids have been found in their vitelline cells (Grant et al 1977, Erasmus et al 1982, Thulin 1982, Fairweather et al 1988, Podvyaznaya 2003. Ginetsinskaya (1968) believed that the presence of a large amount of lipid droplets at the beginning of digenean larval development may be dependent on oxygen levels in the surrounding environment, such that many lipids occur when oxygen levels are low.…”

Section: Lipid Droplets and Glycogenmentioning

confidence: 99%

Ultrastructure of the vitellarium in the digeneans Phyllodistomum angulatum (Plagiorchiida, Gorgoderidae) and Azygia lucii (Strigeida, Azygiidae)

Poddubnaya

Bruňanská

Świderski³

et al. 2012

Acta Parasitologica

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Fine structural features of the vitellarium of two digeneans, Phyllodistomum angulatum and Azygia lucii, are documented and compared with those of other digenean species. The cytodifferentiation of immature vitelline cells (vitellocytes) assumes the production and subsequent accumulation in their cytoplasm of several inclusions. Mature vitelline cells of P. angulatum are characterized by the presence of vitelline clusters (~2.7 μm in diameter, with ~100 vitelline globules of ~0.35 μm in diameter) and osmiophobic, saturated lipid droplets (~2-3 μm in diameter), and in A. lucii vitelline clusters of the same diameter include much fewer vitelline globules (~50 globules of ~0.5 μm in diameter), osmiophilic lipid droplets and α-glycogen. In both P. angulatum and A. lucii, interstitial cells are also present within the vitellarium. Two types of contact sites (septate and tight junctions) between adjoining interstitial cells also occur in both digenean species. Judging from the present and previous ultrastructural studies, it is suggested that there are three potential discriminatory characters of the digenean vitellarium (the number of different types of cell components within the vitellarium, the presence and type of junctional complexes between these cells, and the isolation of the vitellarium from the surrounding tissue) which may prove useful for a better understanding of the biology and evolutionary history of the different digenean groups.

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Structure and function of the female reproductive ducts of the fish blood-flukeAporocotyle simplexOdhner, 1900 (Digenea: Sanguinicolidae)

Cited by 13 publications

References 16 publications

Ultrastructure of the digestive system of the cercaria of Sanguinicola inermis Plehn, 1905 (Digenea: Sanguinicolidae)

Ultrastructure of the digestive system of the cercaria of Sanguinicola inermis Plehn, 1905 (Digenea: Sanguinicolidae)

Ultrastructural characteristics of the uterine epithelium of aspidogastrean and digenean trematodes

Ultrastructure of the vitellarium in the digeneans Phyllodistomum angulatum (Plagiorchiida, Gorgoderidae) and Azygia lucii (Strigeida, Azygiidae)

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