S. crassa

S. crassa may refer to:
 * Sarcosphaera crassa, the only species in the Sarcosphaera genus of fungi
 * Scolopendra crassa, species of centipede
 * Shorea crassa, species of plant
 * Strigocossus crassa, species of moth
 * Sarcohyla crassa, species of frog in the family Hylidae
 * Sertularella crassa, branching colonial hydroid
 * Sphenophryne crassa, species of frog in the family Microhylidae
 * Sannantha crassa, species in the myrtle family