''Elephantoceras'' is genus of a

Middle Permian The Guadalupian is the second and middle series/epoch of the Permian. The Guadalupian was preceded by the Cisuralian and followed by the Lopingian. It is named after the Guadalupe Mountains of New Mexico and Texas, and dates between 272.95 ± 0. ...

ammonite Ammonoids are a group of extinct marine mollusc animals in the subclass Ammonoidea of the class Cephalopoda. These molluscs, commonly referred to as ammonites, are more closely related to living coleoids (i.e., octopuses, squid and cuttlefish) ...

belonging to the goniatitid family Pseudohaloritidae. Fossils belonging to this genera were found in China.

References

Shouchangoceratinae Ammonites of Asia Goniatitida genera Permian ammonites {{Goniatitida-stub