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Structure and function in the nematode pharynx

I. The structure of the pharynges of Ascaris lumbricoides, Oxyuris equi, Aplectana brevicaudata and Panagrellus silusiae

Published online by Cambridge University Press:  06 April 2009

C. J. Mapes
C. J. Mapes
Affiliation:
Department of Zoology, University of Bristol*
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Extract

The simple cylindroid pharynx of Ascaris lumbricoides has been shown to be characterized by a pharyngo-intestinal valve which is composed of two sets of valves. This is the only valve structure in the pharynx of this nematode. The pharynges of Oxyuris equi, Aplectana brevicaudata and Panagrellus silusiae have a series of valve structures along the lengths of the organs. All these types have a valve at the anterior end of the corpus, corrugated ‘valves’ in the posterior bulb, and pharyngo-intestinal valves. A valve between the corpus and the isthmus has been shown in Oxyuris.

In all the nematodes studied the pharyngo-intestinal valve is characterized by an overlapping of the muscle fibres associated with the valve and the main musculature of the pharynx that immediately precedes them. It has been suggested that the pharyngo-intestinal valves of the types studied may have evolved from the type of valve found in the Enoplina.

The marginal tissues of the pharynx of Ascaris lumbricoides have been shown to be composed of three types of tissues. It has been suggested that the marginal tissues have a suspensory and skeletal function. The suspensory strands subserve the first function, while the investing strands and the associated fibrous layer provide a longitudinal skeletal structure in the pharynx. In Oxyuris no fibrous layer is associated with the marginal tissues.

I would like to thank Professor J. E. Harris and Dr H. D. Crofton for their help and criticism during the course of this work, which was carried out during the tenure of a Postgraduate Studentship awarded by the Agricultural Research Council.

Type
Research Article
Information
Parasitology , Volume 55 , Issue 2 , May 1965 , pp. 269 - 284
Copyright
Copyright © Cambridge University Press 1965

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References

Allégen, C. (1921). Über die Natur und die Bedeutung der Fasersystems im Oesophagus einiger Nematoden. Zool. Anz. 53, 76–87.Google Scholar
Chitwood, B. G. (1931). A comparative histological study of certain nematodes. Z. Morph. Ökol. Tiere 23, 237–84.CrossRefGoogle Scholar
Chitwood, B. G. & Chitwood, M. B. (1937). The esophagi of representatives of the Enoplida. J. Wash. Acad. Sci. 27, 517–31.Google Scholar
Chitwood, B. G. & Chitwood, M. B. (1950). An Introduction to Nematology. Baltimore: Monumental Printing Co.Google Scholar
Doncaster, C. C. (1962). Nematode feeding mechanisms. 1. Observations on Rhabditis and Pelodera. Nematologica, 8, 313–20.CrossRefGoogle Scholar
d'Udeken, M. (1859). Notice sur quelques parasites du Julius terrestris. Bull. Acad. Roy. S2, 7, 557–67.Google Scholar
Filipjev, I. N. (1934). The classification of free-living nematodes and their relation to the parasitic nematodes. Smithson. misc. Coll. 89, no. 6, 1–63.Google Scholar
Goldschmidt, R. (1904). Der chromidial Apparat lebhaft funktionierender Gewebszellen. Zool. Jb. Abt. Anat. 21, 41–140.Google Scholar
Goodey, T. (1924 a). The anatomy of Oesophagostomum dentatum (Rud.) a nematode parasite of the pig, with observations on the structure and biology of the free-living larvae. J. Helminth. 2, 1–14.CrossRefGoogle Scholar
Goodey, T. (1924 b). The anatomy and life-history of the nematode Rhabdias fuscovenosa (Railliet) from the grass snake Tropidonotus natrix. J. Helminth. 2, 51–64.CrossRefGoogle Scholar
Harris, J. E. & Crofton, H. D. (1957). Structure and function in the nematodes. Internal pressure and cuticular structures in Ascaris. J. exp. Biol. 34, 116–30.CrossRefGoogle Scholar
Hsü, H. F. (1929). On the oesophagus of Ascaris lumbricoides. Z. Zellforsch. 9, 313–26.CrossRefGoogle Scholar
Ihle, I. E. W. & Van Oordt, G. T. (1929). On the larval development of Oxyuris equi. Proc. Acad. Sci. Amst. 23, 603–12.Google Scholar
Imminck, B. D. C. M. (1924). On the microscopical anatomy of the digestive system of Strongylus edentatus Looss. Archs Anat. Histol. Embryol. 3, 281–326.Google Scholar
Looss, A. (1896). Ueber den Bau des Oesophagus bei einigen Ascariden. Zbl. Bakt. (1. Abt. Orig.), 19, 5–13.Google Scholar
Looss, A. (1905). The anatomy and life-history of Agchylostoma duodenale Dub. Rec. Egypt Govt. Schl. Med. 3, 1–158.Google Scholar
Martini, E. (1907). Ueber Subcuticular und Seitenfelder einiger Nematoden. Z. wiss. Zool. 86, 1–54.Google Scholar
Martini, E. (1916). Die Anatomie der Oxyuris curvula. Z. wiss. Zool. 116, 137–534.Google Scholar
Martini, E. (1922). Ueber die Fibrillensysteme im Pharynx der Nematoden. Zool. Anz. 54, 193–8.Google Scholar
Plenk, H. (1924). Nachweis von Querstreifung in sämtlichen Muskelfasern von Ascaris megalocephala. Z. ges. Anat. 1. Z. Anat. EntwGesch. 73, 358–88.Google Scholar
Plenk, H. (1925). Zur Histologie der Muskelfasern von Ascaris, Lumbricus und Hirudo. Anat. Anz. 60, 27–275.Google Scholar
Plenk, H. (1926). Beiträge zur Histologie der Muskelfasern von Lumbricus und Hirudo, nebst Berichtigungen zu meinen Utersuchungen über den Bau der Ascaris und Mollusken-muskelfasern. Z. mikr.-anat. Forsch, 4, 163–202.Google Scholar
Rauther, M. (1907). Ueber den Bau des Oesophagus und die Lokalisation der Nervenfunktion bei freilebenden Nematoden. Zool. Jb. Abt. Anat. 23, 703–38.Google Scholar
Rauther, M. (1930). Vierte Klasse des Cladus Nemathelminthes. Nematodes. Nematoidea = Fadenwürmer. Handb. Zool. Berl. 2, 249–402.Google Scholar
Schneider, K. C. (1902). Lehrbuch der vergleichenden Histologie der Tiere. Jena.CrossRefGoogle Scholar
Skrjabin, K. I. (1916). Parastic trematodes and nematodes collected by the expedition of Prof. V. Dogiel and I. Sokolov in British East Africa. Dogiel, V. A. & Sokolov, I. I. Scientific results of the zoological expedition to British East Africa and Uganda, 1, 99–157.Google Scholar
Sprent, J. F. A. (1962). The evolution of the Ascaridoidae. J. Parasit. 48, 818–24.CrossRefGoogle Scholar
Sprent, J. F. A. (1963). The life history and development of Amplicaecum robertsi, an ascaridoid nematode of the carpet python (Morelia spilotes variegatus). Parasitology, 53, 7–38.Google Scholar
Thomas, L. J. (1931). Rhigonema nigella spec.nov., a nematode and its plant commensal, Enterobius sp? from the milliped. J. Parasit. 17, 30–4.Google Scholar
Wetzel, R. (1930). On the biology of the fourth stage larva of Oxyuris equi (Schrank). J. Parasit. 17, 95–7.CrossRefGoogle Scholar