spiny softshell(n = noun.animal) trionyx spiniferus - river turtle of western United States with a warty shell; prefers quiet water;
is a kind of pancake turtle, soft-shelled turtle
is a member of genus trionyx, trionyx

atlantic spiny dogfish, pacific spiny dogfish, smooth softshell, spiny, spiny anteater, spiny dogfish, spiny lizard, spiny lobster, spiny puffer, spiny talinum, yellow spiny daisy