Types of sensory cells in Notocotylus attenuates (Rud., 1809) rediae (Digenea, Notocotylidae)

Czubaj, A.; Niewiadomska, K.

doi:10.1007/bf00539572

Cited by 8 publications

(5 citation statements)

References 27 publications

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“…In contrast, monociliated sensory papillae in adults show greater diversity at the ultrastructural level, namely through rootlet morphology, shape of nerve bulb, number of dense collars, and especially through the abundance of vesicles in the neuroplasm. The identified components of the free ciliated sensory papillae in adult R. parvicaudatus are also characteristic of simple monociliated sensory endings described for various digeneans at different life cycle stages (Antonelli et al, 2014;Czubaj & Niewiadomska, 1988Dixon & Mercer, 1965;Dunn et al, 1987;Pan, 1980;Poddubnaya, Zhokhov, & Gibson, 2020;Podvyaznaya & Galaktionov, 2012;Silk & Spence, 1969;Tihomirov, 2000;Wilson, 1970;Žd'árská & Nebesářová, 2003), as well as for other representatives of the Neodermata group (e.g., Biserova et al, 2016;Lyons, 1973;Rohde, 1989Rohde, , 1990. The arrangement of cytoskeletal structures is probably of decisive importance for the mechanoreceptive function of sensory bulbs, for example those identified in the S 2 acetabular group in maritae and cercariae of R. parvicaudatus (present study; Denisova & Shchenkov, 2020b).…”

Section: Sensory Papillaementioning

confidence: 90%

Microanatomy and ultrastructure of the nervous system of adult Renicola parvicaudatus (Digenea: Renicolidae)

Denisova,

Shchenkov,

Lebedenkov

2024

Journal of Morphology

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The digenean complex life cycle includes various morphological forms with different locomotory and behavioral activities, and the functional specialization of their nervous system is of importance for the transmission of these parasites. Adult digeneans acquire many adaptive features associated with the final settlement in a vertebrate host. Our study describes the general morphology and ultrastructure of the nervous system of the adult renicolid digenean Renicola parvicaudatus parasitizing the renal tubules of herring gulls. Using immunocytochemical and electron microscopic methods, we identified the distinctive characteristics of ganglia and synapses in the studied species. A comparative analysis of the organization of the nervous system of adult individuals and their continuously‐swimming stylet cercariae revealed a number of stage‐related differences in the composition of ganglia, the distribution of serotonin‐ and FMRFamide‐immunoreactive neurons, the cytomorphology of neuron somata and free sensory endings. Thus, in adults, the presence of FMRFamide‐positive neuron somata, accessory muscle bundles in the ganglionic cortex, and eight types of neuronal vesicles was detected, but no glia‐like elements were identified. Their neurons are characterized by a larger volume of cytoplasm and also show greater ultrastructural diversity. Although the sensory papillae of adults do not vary in their external morphology as much as those of larvae, their sensory bulbs are more diverse in cytomorphology. Following our previous data on the “support” cell processes related to various tissues of the larvae and considered as glia‐like structures, we also briefly present the identified features of the parenchyma, attachment organs and excretory system of adult individuals. The excretory system of adult R. parvicaudatus is characterized by the presence of unique terminal cells with several flame tufts, which are not typical either for the larvae of this species or for other digeneans studied so far. We also used molecular phylogenetic analysis to clarify species identification.

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Section: Sensory Papillaementioning

confidence: 90%

Microanatomy and ultrastructure of the nervous system of adult Renicola parvicaudatus (Digenea: Renicolidae)

Denisova,

Shchenkov,

Lebedenkov

2024

Journal of Morphology

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“…Sensilla of these worms resemble the unciliated * Figs. 14-17. sensilla of groups described earlier in this article (e.g., Pariselle and Matricon-Gondran, 1985;Czubaj and Niewiadomska, 1988). Most sensilla are formed by dendrite tips that project through the syncytial tegument, attach to it by septate junctions with one or two underlying dense collars, and bear a single sensory cilium that may or may not have a banded rootlet (Fig.…”

Section: Monogenesmentioning

confidence: 98%

“…The axonemal doublet tubules are not always uniformly oriented and extra single or doublet tubules (e.g., 13 peripheral doublets plus 5 central doublets; Hoole and Mitchel, 1981) can occur. Examples of two complete axonemes within a single process have also been seen (Czubaj and Niewiadomska, 1988). Freely swimming larvae (miracidia and cercariae) have a sensillum with multiple "cilia" recessed in a pit similar to that of multiciliated sensilla of monogeneans (Matricon-Gondrian, 1971;Brooker, 1972).…”

Section: Monogenesmentioning

confidence: 99%

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Peripheral sensilla of some lower invertebrates: The platyhelminthes and nematoda

Wright

1992

Microscopy Res & Technique

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The flatworms (Platyhelminthes) and the round worms (Nematoda) are phyla exhibiting strikingly different levels of cellular organization. In both, sensilla are composed of the endings of sensory dendrites intercalated into their epidermis. In flatworms, sensilla that penetrate the syncytial epidermis bear sensory processes derived from cilia. In free-living species, the sensory processes more closely resemble motile cilia, while in parasites, greater deviations occur from the classical cilium pattern. Estimates of the function of the various sensilla have been largely arbitrary, and remain based on ultrastructural features. Sensilla in round worms lie below or within a heavy secreted cuticle. Two glia-like cell types occur. The socket cell mediates contact with cuticle and is responsible for cuticular modifications essential for operation of the sensillum. The sheath cell forms a receptor cavity around the sensory processes and regulates its environment. Sensory processes vary greatly from the classical cilium pattern. Absence of a basal body, but preservation of a ciliary necklace, suggests that the latter has a primary importance in sensory transduction. Estimates of function are based largely on ultrastructural features and analogies to arthropod sensilla. Genetic studies with the free-living nematode Caenorhabditis are beginning to demonstrate details of function and development. Speculations on the roles of basal bodies, rootlets, and vesicles and on the significance of recessed sensilla are given.

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“…Sporocysts were treated routinely for electron microscope inves tigations (see Czubaj and Niewiadomska, 1988). Thin sections were DISCUSSION The histofluorescence SPG method visualised a general topography of the aminergic system of the D. pseudospathaceum daughter sporocyst.…”

Section: U Ltrastr U Ctu Rementioning

confidence: 99%

Histofluorescent and ultrastructural demonstration of biogenic amines in daughter sporocyst ofDiplostomum pseudospathaceumNiewiadomska, 1984 (Digenea)

Czubaj

Niewiadomska

1990

Ann. Parasitol. Hum. Comp.

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SummaryThe aminergic neurons in D. pseudospathaceum daughter sporocysts were studied by fluorescence histochemistry and electron microscopy. Green fluorescence showing the presence of catecho lamines was present in the central and peripheral nervous systems.Ultrastructurally different types of vesicles were identified on the basis of their size and morphology. Their possible function was discussed.

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Types of sensory cells in Notocotylus attenuates (Rud., 1809) rediae (Digenea, Notocotylidae)

Cited by 8 publications

References 27 publications

Microanatomy and ultrastructure of the nervous system of adult Renicola parvicaudatus (Digenea: Renicolidae)

Microanatomy and ultrastructure of the nervous system of adult Renicola parvicaudatus (Digenea: Renicolidae)

Peripheral sensilla of some lower invertebrates: The platyhelminthes and nematoda

Histofluorescent and ultrastructural demonstration of biogenic amines in daughter sporocyst ofDiplostomum pseudospathaceumNiewiadomska, 1984 (Digenea)

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