Involved in the ingression of the plasma membrane during cytokinesis, leading to the separation of the daughter cells. Unlike its S.cerevisiae ortholog INN1, it does not play an essential role, probably because the actinomyosin ring is connected to the cell cortex by many more proteins. Interacts with cdc15 and imp2. Localizes at the barrier septum and the cell tip. Belongs to the INN1/fic1 family.