Phyllacanthus mortoni (fossil sea urchin) (Crystal River Formation, Eocene; northern Florida, USA) 1 : 無料・フリー素材/写真
Phyllacanthus mortoni (fossil sea urchin) (Crystal River Formation, Eocene; northern Florida, USA) 1 / James St. John
| ライセンス | クリエイティブ・コモンズ 表示 2.1 |
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| 説明 | Phyllacanthus mortoni - fossil sea urchin from the Eocene of Florida, USA. (Don Bissett collection)Echinoids are one of five living groups of echinoderms. They include the sea urchins, heart urchins, sea biscuits, and sand dollars.Sea urchins are regular echinoids, meaning they have circular skeletons (tests) with a pentaradial symmetry. Heart urchins, sea biscuits, and sand dollars have non-circular tests with a bilateral symmetry.Classification: Animalia, Echinodermata, Echinoidea, Cidaroida, CidaridaeStratigraphy; Crystal River Formation, Ocala Group, Upper EoceneLocality: undisclosed site in northern Florida, USA |
| 撮影日 | 2015-05-02 10:45:58 |
| 撮影者 | James St. John |
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