Barnacles on beach clast (Hulls Cove, Mt. Desert Island, Maine, USA) 2 : 無料・フリー素材/写真
Barnacles on beach clast (Hulls Cove, Mt. Desert Island, Maine, USA) 2 / 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 | The whitish spots on this rock are barnacles, an odd group of crustacean arthropods. Crustaceans are a large group of invertebrates that inhabit marine, marginal marine, freshwater, and terrestrial habitats. The group includes crabs, lobsters, shrimp, crayfish, barnacles, ostracods, and other organisms. The oldest fossil crustaceans are in the Cambrian. The group experienced a significant radiation in the oceans during the Mesozoic Marine Revolution.Barnacles are sessile, benthic, filter-feeding, marine crustaceans that are obligate hard substrate encrusters. They are particularly common in intertidal, rocky shore environments. They can tolerate subaerial exposure during low tides but have to be in water at least occasionally. When submerged, they extend their feathery limbs to filter feed. The barnacle body is enclosed in a small, cinder cone volcano-shaped carapace composed of overlapping calcareous plates. Fossil barnacles first appear in Cambrian rocks.Classification: Animalia, Arthropoda, Crustacea, Maxillopoda, CirripediaLocality: coastline at Hulls Cove, eastern side of Route 3, northeastern Mt. Desert Island, coastal Maine, USA (44° 24.940’ North latitude, 68° 15.047’ West longitude) |
| 撮影日 | 2006-09-12 10:31:07 |
| 撮影者 | James St. John |
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