Noritaceae - Taxonomy - Noritacean Taxonomy in The Treatise

Noritacean Taxonomy in The Treatise

The Treatise, Part L, gives 13 families in the Noritacea, six of which collectively contain 15 subfamilies. Of these:

The Flemingitidae and Meekoceratidae have been place in the Meekocerataceae along with the Prionitidae and Proptychitidae.

The Hedenstroemiidae, less the Lanceolitinae, have been combined with middle and upper Triassic late derivatives of the Medlicottiadae, the Sageceratidae, in what is known as the Sageceratceae. Medlicottiadae is a family in the Melicottiaceae, a superfamily of prolecanitids (order Prolecanitida).

Sageceras, type genus of the Sageceratidae, is described as having lenticular shells with flattened bicarinate venters and small umbilici. Sutures form numerous subequal auxiliary and adventitious lobes.

Hedenstroemiidae are described as having discoidal, compressed, generally smooth, involute shells with tabulate to oxynote venters. Suture are ceratitic with adventitious saddles and lobes.