revision preference src: It lived about 89 million years ago (Turonian stage). Therefore, while only large numbers of its teeth, and jaw fragments are known, it might have resembled a massive nurse shark or a sand tiger shark. <SEP> tgt: It lived about 89 million years ago (Turonian stage). While only large numbers of its teeth, and jaw fragments are known, it might have resembled a massive nurse shark or a sand tiger shark.