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A Contribution to the Life-history of a Gnathostome

Published online by Cambridge University Press:  06 April 2009

Asa C. Chandler
Asa C. Chandler
Affiliation:
From the Hookworm Research Laboratory, financed by Indian Jute Mills Association, Calcutta School of Tropical Medicine.
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Extract

The family Gnathostomidae contains several genera and a fair number of species of nematodes of rather aberrant type and of uncertain affinities. As pointed out by Baylis and Lane (1920) in their excellent revision of the family, there is little doubt but that it should be included in the superfamily Spiruroidea. The subfamily Gnathostominae is characterised by the possession of a head bulb containing four closed membranous hollow structures, called ballonets by Baylis and Lane, connected posteriorly with four elongate sac-like structures designated cervical sacs. Three genera are recognised in this sub-family as follows: Tanqua, in which the head bulb is provided with transverse cuticular ridges, and Echinocephalus and Gnathostoma in which the head bulb is provided with rows of thorn-like spines. In Echinocephalus the body is smooth and destitute of cuticular spines, whereas in Gnathostoma all or a large part of the body has rows of cuticular spines on the posterior edges of the annulations. The first two genera are parasitic in the intestinal tract of cold-blooded vertebrates, whereas Gnathostoma apparently has its normal habitat in the stomach wall of mammals, as Baylis and Lane have pointed out.

Type
Research Article
Information
Parasitology , Volume 17 , Issue 3 , August 1925 , pp. 237 - 244
Copyright
Copyright © Cambridge University Press 1925

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References

Baylis, H. A. and Lane, C. (1920). A Revision of the Nematode Family Gnathostomidae. Proc. Zool. Soc. Lond., 1920, 2, 245–310.CrossRefGoogle Scholar
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