The Adriantinae which are found widespread in
lower and
middle Permian marine sediments are derived from
Crimites, a genus in the more primitive
Emilitinae subfamily, through
Neocrimites which gave rise to
Adrianites,
Epadrianites,
Pseudagathiceras, and
Sosiocrimites (Saunders et al. 1999). In the older taxonomy of Miller et al.,(1960), the Adrianitinae consists of
Adrianites,
Hoffmannia,
Doryceras,
Crimites, and
Texoceras.
Hoffmannia and
Texoceras are each now their own subfamily,
Hoffmanniinae and
Texoceratinae respectively.
Doryceras and
Crimites are removed from the Adrianitinae and placed in the Emilitinae (sometimes given as Emiliidae).
Epadrianites,
Metaricoceras,
Neocrimites and
Sosiocrimites, which were considered possible equivalents of
Adrianites in Miller et al., are distinguished separately in what is now the Adrianitinae.
Pseudagathiceras, once thought a possible equivalent of
Doryceras, has been added.
Neocrimites is the most primitive of the Adrianitinae and is the source (Saunders et al. 1999) for
Adrianites,
Epadrianites,
Pseudagathiceras, and
Sosiocrimites.
Adrianites and related genera are found widespread in the middle Permian, especially from Sicily and Texas. ==Genera==