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The oldest fossil crustaceans are in the Cambrian. The group experienced a significant radiation in the oceans during the Mesozoic Marine Revolution. The above photo depicts a ~freshly dead female blue crab, Callinectes sapidus. Info. from Witherington & Witherington (2007): "Blue crabs are swimming crabs in the Family Portunidae.
Blue crab escaping from the net along the Core Banks of North Carolina.. Callinectes sapidus (from the Ancient Greek κάλλος,"beautiful" + nectes, "swimmer", and Latin sapidus, "savory"), the blue crab, Atlantic blue crab, or, regionally, the Maryland blue crab, is a species of crab native to the waters of the western Atlantic Ocean and the Gulf of Mexico, and introduced internationally.
The blue crab, Callinectes sapidus was chosen as the state crustacean of Maryland in 1989. [17] C. sapidus is a crab found in the waters of the western Atlantic Ocean, the Pacific coast of Central America and the Gulf of Mexico. The blue crab may grow to a carapace width of 230 mm (9.1 in).
Index fossils are species of plants or animals that existed over a wide area for a geologically short period of time . [3] The cephalopod Jeletzkytes nodosus is a time-sensitive fossil found in rocks a little younger than 70.6 million years old in the western United States. Other index fossils from Coon Creek date a little older than 70.6 ...
Lee ‘Lucky’ Alewine, left, prepares to refrigerate their blue crab catch at Rusty Crabs on Sept. 20, 2024, as William Beveridge moves bushels of crabs from the boat to be sold to a vendor on ...
The order is estimated to contain nearly 15,000 extant species in around 2,700 genera, with around 3,300 fossil species. [1] Nearly half of these species are crabs, with the shrimp (about 3,000 species) and Anomura including hermit crabs , king crabs , porcelain crabs , squat lobsters (about 2500 species) making up the bulk of the remainder. [ 1 ]
After an analysis of new fossil material, the subgenera were elevated to the rank of genus, and three new genera were erected. [3] Most of the family's current diversity is found in temperate waters of the Northern Hemisphere .
There are 25 types of trace fossils of horseshoe crab, brachiopods, trilobites and pawless armor-plated fish that lived 450 million years ago in a lagoon. The fossils are set in rock of Harding Formation. [2] It is considered North America's best site of trace fossils because it shows the movement of the ancient animals. [1]