S. fragilis may refer to: * Salinator fragilis, an air-breathing land snail species * Salix fragilis, the crack willow, a willow species native to Europe and western Asia * Sinocoelurus fragilis, a theropod dinosaur species from the Upper Jurassic * Skania fragilis, a fossil arthropod species from the Cambrian * , a flowering plant species in the genus Swainsonanative to Australasia