H C Hechler
The structure of the basal esophageal sheath was studied in Axonchium amplicolle, A. choristurn, A. crassum, A. gigas, A. micans, A. rotundum, A. serpens, A. solitare, Dorylairnellus aequalis, D. parvulus, D. tenuidens, Oxydirus gangeticus, O. gigus, O. oxycephaloides, and Swangeria bisexualis. In A. gigas the muscle bands comprising the sheath spiral dextrally, but in the other species of Axonchiurn they do not spiral but lie parallel to the esophagus. In O. gigus the spiral is sinistral, whereas in the other two species of Oxydirus it is dextral...
April 1969: Journal of Nematology