. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 92 H. Ulrich & R. M. Schmelz. Fig. 2. Dolichopus iingulatus ? with an enchytraeid. The worm has been grasped at some distance from its end which is folded back. Swabian Jura, Härtsfeld, 10 July 1970. (1828a: 15-16, 1828b: 227-228). The mouthparts of Dolichopodidae have been studied repeatedly. A classical account of their structure and function was published by Snodgrass (1922), extensive comparative descriptions by Cregan (1941) and Sato (1991). Having seized t
. Bonner zoologische Beiträge : Herausgeber: Zoologisches Forschungsinstitut und Museum Alexander Koenig, Bonn. Biology; Zoology. 92 H. Ulrich & R. M. Schmelz. Fig. 2. Dolichopus iingulatus ? with an enchytraeid. The worm has been grasped at some distance from its end which is folded back. Swabian Jura, Härtsfeld, 10 July 1970. (1828a: 15-16, 1828b: 227-228). The mouthparts of Dolichopodidae have been studied repeatedly. A classical account of their structure and function was published by Snodgrass (1922), extensive comparative descriptions by Cregan (1941) and Sato (1991). Having seized the worm, the fly tries to pull it out from its tube. This, if success- ful, is normally done in two steps: first the worm is pulled forth for part of its length, subsequently a second attempt is made to pull it out as a whole. If the fly succeeds and the worm is exposed for all its length, a heavy struggle follows: the worm squirms vigorously, beats around and has a good chance to be released by the fly and not to be attacked again. The larger the worm is in proportion to the fly, the better is its chance to get free. During the fly's second attempt it may happen that the worm is torn in two pieces and the fly gets a fragment only to feed on. If the fly keeps hold of the worm, it will normally take off and fly to a leaf to feed on its prey there. The worm is hanging down from the fly's proboscis, held by the labella. It squirms as long as it can, while it is rhythmically moved up and down by the fly, apparently by alternate retraction and protraction of the labium. By these movements the end of the prey held between the labella is probably pushed against the epipharyngeal armature which serves to lacerate its body wall (see Snodgrass 1922). In all cases observed by me, the flies did not use their legs to support the labella in seizing or holding the prey. However, a female of Argyra auricoUis did use a fore leg. Please note that these images are extracted from scanned page im
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