The paired organelle involved in cell division found in animal but not plant cells is the centriole.

Here's why:

* Centrioles are small, cylindrical structures made of microtubules. They are involved in organizing the microtubules that form the spindle fibers during cell division. These spindle fibers are essential for separating the chromosomes during mitosis and meiosis.

* Plant cells do not have centrioles. Instead, they use a structure called the microtubule organizing center (MTOC) to organize the spindle fibers. This MTOC is often located near the nucleus and is associated with the nuclear envelope.

So, while both animal and plant cells undergo cell division, the mechanism for organizing the spindle fibers differs due to the presence or absence of centrioles.