File:Arenaeus cribrarius (speckled crab) (Sanibel Island, Florida, USA) 2.jpg

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English: Arenaeus cribrarius (Lamarck, 1818) - dorsal view of a speckled crab carapace in Florida, USA. (January 2016)

Orientation: anterior at top; posterior below.

The crustaceans are a large group of arthropods that inhabit marine, marginal marine, freshwater, and terrestrial habitats. The crustaceans include 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.

Seen here is the carapace of a speckled crab, Arenaeus cribrarius. This species is a swimming crab with a carapace morphology similar to that of blue crabs (Callinectes sapidus - see: www.flickr.com/photos/jsjgeology/23886163513). Speckled crabs are frequently infaunal - they bury themselves in shallow-water and beachface sandy sediments. Arenaeus cribrarius preys on molluscs, decapods, and fish. (info. synthesized from Witherington & Witherington, 2007)

Classification: Animalia, Arthropoda, Crustacea, Malacostraca, Decapoda, Brachyura, Portunidae

Locality: marine beach near Sanibel Lighthouse, near the eastern tip of Sanibel Island, Gulf of Mexico Coast of southern Florida, USA

More info. at: en.wikipedia.org/wiki/Crustacean and www.inaturalist.org/taxa/122198-Arenaeus-cribrarius

Reference cited:

Witherington & Witherington (2007) - Florida's Living Beaches, a Guide for the Curious Beachcomber. Sarasota, Florida. Pineapple Press, Inc. 326 pp.
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Source https://www.flickr.com/photos/47445767@N05/31013301331/
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/31013301331. It was reviewed on 15 October 2020 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

15 October 2020

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