Abstract
The swimming of two scyllarid lobsters Ibacus peronii Leach and Thenus orientalis Lund was studied and compared with the swimming of the palinurid lobster Jasus novaehollandiae Holthuis. In the two scyllarid lobsters significant lift is created during backward tail flips. Articulation of the flattened antennal plates alters the distribution of this lift so that pitching and rolling moments are created which are used in continuous swimming and in performing manoeuvres. By contrast J. novaehollandiae generates a negligible amount of lift during each tail flip and its antennae are not shaped or positioned to control any lift that is created, consequently backward tail flips in these animals cannot be used to produce efficient continuous swimming or manoeuvering.
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