with an extended mandibular symphysis supporting the projecting lower incisors

depending on the allometric models used and comparisons with extant lamniforms such as Carcharodon carcharias

They were extremely elongated

typical of predatory theropods

Phiomia serridens Scale:1:20 with an extended mandibular symphysisPhiomia serridens was a primitive proboscidean from the Late Oligocene, which lived approximately 3730 million years ago in North Africa, especially in what is now Egypt. It represents an intermediate evolutionary phase in the early radiation of elephantiforms, showing a combination of archaic traits and characteristics that anticipate the morphology of modern elephants. It was a medium sized animal, with a body length of approximately 2. 53 meters