Upside down jellyfish (Cassiopea) : 無料・フリー素材/写真
Upside down jellyfish (Cassiopea) / wallygrom
| ライセンス | クリエイティブ・コモンズ 表示-継承 2.1 |
|---|---|
| 説明 | The marine exhibit in the basement of the Palm House at Kew Gardens ... all sorts of plants and creatures from the sea, mud flats, and marshes ...From Wikipedia -Cassiopea (upside-down jellyfish) is a genus of true jellyfish and the only members of the family Cassiopeidae. They are found in warmer coastal regions around the world, including shallow mangrove swamps, mudflats, canals, and turtle grass flats in Florida. The medusa usually lives upside-down on the bottom, which has earned them the common name. Where found, there may be numerous individuals with varying shades of white, blue, green and brown.They have a mild sting since they are primarily photosynthetic, but sensitive individuals may have a stronger reaction. The photosynthesis occurs because, like most corals, they host zooxanthellae in their tissues. The stinging cells are excreted in a mucus; swimming over the jellyfish (especially using swim fins) may cause transparent, essentially invisible, sheets of this mucus to be lifted up into the water column, where they are then encountered by unsuspecting swimmers. The stings, appearing in the form of a red rash-like skin irritation, are known for being extraordinarily itchy. Sometimes this jellyfish is picked up by the crab Dorippe frascone (family Dorippidae) and carried on its back. The crab uses the jellyfish to defend itself against possible predators. |
| 撮影日 | 2013-10-20 16:30:54 |
| 撮影者 | wallygrom |
| タグ | |
| 撮影地 | London, England, United Kingdom 地図 |
| カメラ | Canon PowerShot SX200 IS , Canon |
| 露出 | 0.025 sec (1/40) |
| 開放F値 | f/3.4 |
| 焦点距離 | 5 mm |