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Action of the Feeding Pump in Longidorus Caespiticola Hooper

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image of Nematologica
For more content, see Nematology.

Behaviour of the oesophageal bulb feeding pump in Longidorus caespiticola has been analysed: a primary analysis diagram was constructed on the basis of previous work and by making a priori assumptions about how the pump works. A second diagram, based on further detailed analysis of ciné film, was compared with the first. This comparison showed when and how certain structures were being brought into play, even when such action could not be observed directly; in particular, the longitudinal muscles and their associated longitudinal bands of circumferentially orientated muscle fibres. Study of a working sectional scale model of the pump lining and muscles suggested how some parts of the pump must be displaced and pressurised during opening to create an effective closing force. On the basis of analyses and model findings a scheme of operation of the oesophageal feeding pump in L. caespiticola is presented and the following discussed: the nature of closing forces, functions of the greatly thickened pump lining plates, sequential control of pumping, transition zones between open and closed pump lining, and nature of the oesophago-intestinal valve.

Affiliations: 1: Nematology Department, Rothamsted Experimental Station, Harpenden, Herts. AL5 2JQ. U.K.


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