Translations:Adventist Youth Honors Answer Book/Nature/Crustaceans/29/en
From Pathfinder Wiki
Siri is another word for swimming crabs, in the genus Callinectes. The legs of walking crabs are referred to as pereopods, the modified appendages of swimming crabs as pleopods. The pleopods are flattened and oar-like, allowing the crabs to move through the water. Swimming crabs are found in many marine environments around the world, often in near shore areas with sandy bottoms. Walking crabs are found in both sandy and rocky areas offshore and onshore.
