Decapod

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A decapod is a crustacean in the large order of Decapoda (from Ancient Greek δέκά déka 'ten' + πούς poús 'foot') within the class Malacostraca, including crabs, lobsters, crayfish, shrimp, and prawns. Most decapods are scavengers. The order is estimated to contain nearly 15,000 extant species in around 2,700 genera, with around 3,300 fossil species. 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. The earliest fossils of the group date to the Devonian.

Read on Wikipedia · Image File:Sally Lightfoot crab (4202519454).jpg: Magnus Manske (uploader), Original by Peter Wilton [1] File:Christmas Island (5775073180).jpg: [2] by DIAC Images File:Lysmata amboinensis in Tropicarium-O…, CC BY-SA 4.0