File:Medusa- Hydraulic Propulsion.jpg
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[edit]DescriptionMedusa- Hydraulic Propulsion.jpg |
English: The medusa (jelly) stage occurs in most hydrozoa and scyphozoa. This phase of the life cycle is the free-swimming and sexual phase (when present). Propulsion through the water is achieved by taking water into a central cavity (the gastro-vascular cavity or GVC). Muscles in the bell (medusa) push inward, creating a powerful outflow from the stoma ("mouth") that pushes the animal forward. As the muscles relax, the elastic recoil again brings water into the animal.
The classic semicircular shape of the jelly resists forward movement. The shape may inhibit animal’s progress through the water and increases the efficiency of feeding. |
Date | |
Source | Own work |
Author | M. Readey |
Permission (Reusing this file) |
I, the copyright holder of this work, hereby publish it under the following license: This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license.
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 21:09, 28 January 2012 | 7,002 × 5,100 (2.95 MB) | Circa24 (talk | contribs) |
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Orientation | Normal |
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Horizontal resolution | 600 dpi |
Vertical resolution | 600 dpi |
Software used | Adobe Photoshop CS2 Windows |
File change date and time | 15:00, 28 January 2012 |
Color space | Uncalibrated |
Image width | 7,002 px |
Image height | 5,100 px |
Date and time of digitizing | 08:06, 28 January 2012 |
Date metadata was last modified | 09:00, 28 January 2012 |
IIM version | 2 |