''Dagnoceras'' is a

ceratitid Ceratitida is an order that contains almost all ammonoid cephalopod genera from the Triassic as well as ancestral forms from the Upper Permian, the exception being the phylloceratids which gave rise to the great diversity of post Triassic ammoni ...

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) ...

from the

Lower Triassic The Early Triassic is the first of three epochs of the Triassic Period of the geologic timescale. It spans the time between Ma and Ma (million years ago). Rocks from this epoch are collectively known as the Lower Triassic Series, which is a un ...

that has a basically evolutute, discoidal shell with an arched venter and ceratitic sutures. The

Treatise A treatise is a formal and systematic written discourse on some subject, generally longer and treating it in greater depth than an essay, and more concerned with investigating or exposing the principles of the subject and its conclusions."Treat ...

1957 includes it in the

Meekoceratidae The Meekoceratidae is a family of ceratitid ammonites described in the ''Treatise on Invertebrate Paleontology The ''Treatise on Invertebrate Paleontology'' (or ''TIP'') published by the Geological Society of America and the University of Kan ...

although it has since been placed in the Dinaritidae.

References

;Notes ;Bibliography * Arkell, et al., 1957. Treatise on Invertebrate Paleontology Part L, Mesozoic Ammonoidea. Geological Society of America. Triassic ammonites Ammonites of Europe Olenekian life {{ammonite-stub