Fine structural observations on the ciliary receptors in the epidermis of three otoplanid species (Turbellaria proseriata)

Bedini, Celina; Ferrero, Enrico; Lanfranchi, Alberto

doi:10.1016/0040-8166(75)90004-x

Cited by 32 publications

(13 citation statements)

References 43 publications

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“…The possible relationships between the degree of invagination of the dendrite tip and the presence of dendrite vesicles and function has not been addressed specifically, but it is feasible that there is a link. Bendini et al (1975) suggest that deeply invaginated sensilla may be secretory. Wright (1992) proposes that the invagination may form a pseudoreceptor cavity reminiscent of some nematode sensilla and may function to increase control or sensitivity of the sensory reception process.…”

Section: Discussionmentioning

confidence: 97%

Morphology, ultrastructure, and implied function of ciliated sensory structures on the developmental stages of Merizocotyle icopae (Monogenea: Monocotylidae)

Cribb

Chisholm

Gould

et al. 2003

Microscopy Res & Technique

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Experimental infections were used to track the fate of the dorsal sensilla of Merizocotyle icopae (Monogenea: Monocotylidae) from nasal tissue of the shovelnose ray, Rhinobatos typus (Rhinobatidae). Scanning and transmission electron microscopy revealed that 3 types of uniciliate dorsal sensilla exist at different times in the development of the monogenean. Type 1 sensilla have little or no invagination where the cilium exits the distal end of the dendrite and possess a ring of epidermis surrounding the cilium distal to the invagination. Type 2 sensilla have a deep invagination where the cilium exits the dendrite. Type 3 sensilla can be distinguished from the other types by the shape of the dendrite. The larvae have predominantly Type 1 dorsal sensilla, most of which are lost approximately 24 h after infection and a few Type 2 sensilla, which are retained. Additional Type 2 sensilla (termed Adult Type 2 sensilla), which are slightly different morphologically from the Type 2 sensilla of the larvae, form in later stages of development. Numerous Type 3 sensilla are unique to the dorsal surface of adults. Loss of all Type 1 sensilla upon attachment to the host, R. typus, suggests that these may be chemo- or mechanoreceptors responsible for host location by the swimming infective larvae. Type 2 sensilla appear to be important in the larvae, juveniles, and adults whereas the modality mediated by Type 3 is specific to adults.

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Section: Discussionmentioning

confidence: 97%

Morphology, ultrastructure, and implied function of ciliated sensory structures on the developmental stages of Merizocotyle icopae (Monogenea: Monocotylidae)

Cribb

Chisholm

Gould

et al. 2003

Microscopy Res & Technique

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“…Rheo-, tango-and chemoreceptive functions have been most often suggested for this latter group of ciliary receptors (see Reuter 1975). Multiciliated receptors are less common, but have been noted in the Otoplanidae (see Bedini et al 1975) and in the pharynx of Haplopharynx and various macrostomids (see Doe 1981).…”

Section: Nervous Systemmentioning

confidence: 99%

Morphology of the Turbellaria at the ultrastructural level

Rieger

1981

Hydrobiologia

112

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The paper reviews the following systems: body wall, nervous system, protonephridia, parenchyma, digestive system, reproductive system, and includes a summary of the literature. New information is presented for the catenulid and neoophoran body wall-construction, the kalyptorhynch proboscis, the catenulid and haplopharyngid protonephridial construction, and the prolecithophoran spermatozoon and female germ cell. Examples of new features, as well as examples of how electron microscopy has clarified the relative position of structures and their substructures are given from the subcellular level to the organization of whole organs. Fine structural features linking different turbellarian orders are summarized. They apparently support Karling's (1974) latest assessment of the affinities between the turbellarian orders which is based primarily on light histological data, they add the recognition of a special link between the Macrostomida and Haplopharyngida and they suggest the existence of three main evolutionary lines within the Turbellaria.

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“…The development of a sheath cell with the capacity to modifylregulate the receptor cavity formed around the sensory processes likely gave greater control or sensitivity to the reception process by reducing noise. A similar function may occur in these flatworm sensilla that are enclosed or ensheathed by the tegument, or where the sensory processes are deeply recessed into the tip of the dendrite (a pseudoreceptor cavity; Figure 2) (Bedini et al, 1975). Internalization of the sensory processes as in nematodes may also have provided them with protection from hostile elements of the environment.…”

Section: Evolutionary and Functional Correlationsmentioning

confidence: 95%

“…4), and, in some (Fig. 5), the ciliary processes are short and irregular and lack tubules (Bedini et al, 1975). Some of the dendrites may have fine irregular processes that extend from the tip around the sensory cilia (Figs.…”

Section: Platyhelminthes-turbellariamentioning

confidence: 98%

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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Fine structural observations on the ciliary receptors in the epidermis of three otoplanid species (Turbellaria proseriata)

Cited by 32 publications

References 43 publications

Morphology, ultrastructure, and implied function of ciliated sensory structures on the developmental stages of Merizocotyle icopae (Monogenea: Monocotylidae)

Morphology, ultrastructure, and implied function of ciliated sensory structures on the developmental stages of Merizocotyle icopae (Monogenea: Monocotylidae)

Morphology of the Turbellaria at the ultrastructural level

Peripheral sensilla of some lower invertebrates: The platyhelminthes and nematoda

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