    Sentence 1: What do Beriods use as  teeth?    Sentence 2: The phylum has a wide range  of body forms, including the flattened,  deep-sea platyctenids, in which the adults  of most species lack combs, and the  coastal beroids, which lack tentacles and  prey on other ctenophores by using huge  mouths armed with groups of large,  stiffened cilia that act as teeth.