THE ABDOMINAL MUSCULATURE OF NYMPHAL CHLOEONDIPTERUM L. (INSECTA: EPHEMEROPTERA) IN RELATION TO GILL MOVEMENT AND SWIMMING
Article first published online: 20 AUG 2009
1958 The Zoological Society of London
Proceedings of the Zoological Society of London
Volume 131, Issue 2, pages 279–291, September 1958
How to Cite
EASTHAM, L. E. S. (1958), THE ABDOMINAL MUSCULATURE OF NYMPHAL CHLOEONDIPTERUM L. (INSECTA: EPHEMEROPTERA) IN RELATION TO GILL MOVEMENT AND SWIMMING. Proceedings of the Zoological Society of London, 131: 279–291. doi: 10.1111/j.1096-3642.1958.tb00688.x
- Issue published online: 30 OCT 2009
- Article first published online: 20 AUG 2009
- Accepted 11th February 1958
- 1The nymph of Chloeon dipterum is a pelagic animal living in ponds, Its plate-like bilamellate gills are described.
- 2By means of metachronal rhythmical movements of the gills, in which members of pairs beat synchronously, currents of water are set up over the body. These currents which are on the whole axial to the body explose water from all regions surrounding the body.
- 3The gill and abdominal musculature is described and it is shown that a modification of normal musculature has occurred to provide direct muscles to the gill bases and also to make possible the habit of swimming by rhythmical movements of the abdomen rather than by limbs. These movements are lateral and are made about a vertical axis. Swimming is always preceded by a vigorous up and down movement of the caudal filaments. This movemelit about a transverse axis as in the tail flukes of a whale is then abandoned as the side to side movements of the abdomen take charge, when the animal swims aa does a fish.