springtail(n = noun.animal) collembolan - any of numerous minute wingless primitive insects possessing a special abdominal appendage that allows the characteristic nearly perpetual springing pattern; found in soil rich in organic debris or on the surface of snow or water;
is a kind of insect
is a member of collembola, order collembola

   Any one of numerous species of small apterous insects belonging to the order Thysanura. They have two elastic caudal stylets which can be bent under the abdomen and then suddenly extended like a spring, thus enabling them to leap to a considerable distance. See Collembola, and Podura. [1913 Webster]

springtail, n. any wingless insect of the order Collembola, leaping by means of a springlike caudal part.