hydromedusa

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hydromedusa

the MEDUSA of a HYDROZOAN.

hydromedusa

see medusa.
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Neuronal mechanism of a hydromedusan shadow reflex.
The shadow response of a hydromedusan (Polyorchis penieillatus): behavioral mechanisms controlling diel and ontogenic vertical migration.
Rather, we interpret them as functionally analogous to the fibrous collar described by West-fall (1970) in the neck region of operculate nematocysts in the hydromedusan Gonionemus vertens.
The hydromedusan velum includes both striated, circular muscle (subumbrellar) and radial, smooth muscle (exumbrellar), so any deformation of the velar ring to form a nozzle can be accomplished with regional (asymmetric) contraction of the radial musculature.