sentences:  Virtually nothing is known of its biology; it is presumed to be aplacental viviparous.Like "I. brasiliensis", the largetooth cookiecutter shark is an ectoparasite that feeds by excising plugs of flesh from larger animals.While "I. brasiliensis" is theorized to latch onto the surface of its prey and bite with a twisting motion, producing a circular wound containing spiral grooves inside from its lower teeth, the largetooth cookiecutter shark seems to employ a "sweeping" bite that produces a larger, more elongate (twice as long as the width of the mouth), oval wound containing parallel tooth grooves.