Bathytheristes is an extinct genus of chimaera from the late Early Jurassic epoch of the Jurassic Period. Its name roughly translates to "Reaper of the deep." It is known from a single species, B. gracilis. It was discovered in the early Toarcian-aged Posidonia Shale Formation of Ohmden, Germany. The specific epithet refers to the slender of the tooth plate in this species. It is related to the modern elephantfish.[1] [2]