''Vermiceras'' is an

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 cuttlefis ...

that belongs to the order

Ammonitida Ammonitida is an order of ammonoid cephalopods that lived from the Jurassic through Paleocene time periods, commonly with intricate ammonitic sutures. Ammonitida is divided into four suborders, the Phylloceratina, Lytoceratina, Ancyloceratin ...

. Its shell is evolute and is covered in nonbranching ribs. Its whorls do not increase in size very fast, but there are many revolutions on its shell, which is fairly narrow. It has a sharp ventral keel and a diameter of about 5.2 centimeters (2 inches). It lived in the

Early Jurassic The Early Jurassic Epoch (geology), Epoch (in chronostratigraphy corresponding to the Lower Jurassic series (stratigraphy), Series) is the earliest of three epochs of the Jurassic Period. The Early Jurassic starts immediately after the Triassic-J ...

Subgenera and species

* ''V. (=Metophioceras) galaczi'' * ''V. (=Metophioceras) rotarium'' * ''V. (=Metophioceras) rotticus'' * ''V. (=Metophioceras) trigonatum'' * ''V. (=Protocymbites) azzouzi'' * ''V. densicostatum'' * ''V. (Gyrophioceras)'' ** ''V. (G.) mineralense'' ** ''V. (G.) morganense'' ** ''V. (G.) praespiratissimum'' ** ''V. (G.) supraspiratum'' * ''V. (Paracaloceras)'' ** ''V. (P.) concavum'' ** ''V. (P.) coregonense'' ** ''V. (P.) multicostatum'' ** ''V. (P.) rursicostatum'' ** ''V. (P.) varaense''

References

;Notes ;Bibliography * Moore, Raymond Cecil., Alfred George. Fischer, and Cecil Gordon. Lalicker. ''Invertebrate Fossils''. New York: McGraw-Hill, 1952. Print. Ammonitida genera Early Jurassic ammonites Arietitidae {{Ammonite-stub