Enables endoribonuclease activity. Involved in rRNA catabolic process and tRNA catabolic process. Predicted to be located in cytosol; nucleoplasm; and site of DNA damage. Orthologous to human SLFN11 (schlafen family member 11) and SLFN13 (schlafen family member 13). [provided by Alliance of Genome Resources, Apr 2022]