cushion star Directory References Discover 6 Animals We Ate Into Extinction 9 of the World’s Deadliest Snakes Water Fluoridation: Just the Facts How Deadly Is Quicksand? Is Cinco de Mayo Mexico's Independence Day? Spies Like Us: 10 Famous Names in the Espionage Game 7 Deadliest Weapons in History Contents cushion star sea star Ask the Chatbot a Question Ask the Chatbot a Question Also known as: Pteraster Learn about this topic in these articles:description In sea starCushion stars, of the circumboreal genus Pteraster, are plump five-rayed forms with raised tufts of spines and webbed, short, blunt arms. Read More