This is a Very Rare, very well preserved Harpactocarinus Crab Fossil from Igualada, Spain.
This genus is known in the fossil record from the Cretaceous to Miocene (age range: from 66.043 to 11.608 million years ago) and have only been found in a handful of locations around the world.
Crabs are decapod crustaceans of the infraorder Brachyura, which typically have a very short projecting “tail” (abdomen), usually entirely hidden under the thorax. They live in all the world’s oceans, in fresh water, and on land, are generally covered with a thick exoskeleton and have a single pair of claws. Many other animals with similar names – such as hermit crabs, king crabs, porcelain crabs, horseshoe crabs and crab lice – are not true crabs.
Due to their rarity, there is very little information available about these Crabs.