Forms a heterodimeric complex in conjunction with mei-1 which severs microtubules in vitro in an ATP-dependent manner. This activity may promote rapid reorganization of cellular microtubule arrays. May act to target mei-1 within the cell. Required specifically for meiotic spindle formation in the female germline. Interacts with mei-1. Localized to the spindle poles and condensed chromatin during female meiosis. Also localized to the polar body. Correct localization requires mei-1. Highly expressed in the female germline.