Barnacles 2

Description:

Description: English: (~4.3 centimeters across at it widest) The crustaceans are a large group of arthropods 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. Crustaceans experienced a significant evolutionary 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, Cirripedia More info. at: en.wikipedia.org/wiki/Crustacean and en.wikipedia.org/wiki/Barnacle. Date: 11 November 2019, 23:37:34. Source: https://www.flickr.com/photos/47445767@N05/49057158107/. Author: James St. John.