Jet propulsion of the calycophoran siphonophoresChelophyesandAbylopsis

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Abstract
Jet propulsion in the small siphonophoresChelophyesandAbylopsiswas investigated by measuring chamber pressures and thrust exerted in tethered nectophores, and by cinephotography of free swimming colonies. Although of similar design, the two siphon-ophores swim at different speeds, and with very different chamber pressures in the locomotor nectophores. Estimates of drag incurred during swimming, and of the cost of the process in the two forms are discussed.