| genus aspidistra | (n) genus of eastern Asiatic herbs; sometimes placed in the family Convallariaceae |
| aspidelaps | (n) African coral snakes, Syn. genus Aspidelaps |
| aspidiotus | (n) a genus of Diaspididae, Syn. genus Aspidiotus |
| aspidophoroides | (n) alligatorfishes, Syn. genus Aspidophoroides |
| genus cerastes | (n) horned vipers, Syn. genus Aspis, Aspis |