The presence of strong tubercles on flank costae but they, differ.From it in having an area surface barely differentiated from the.Flank. While Steinmanella is more similar to Myophorella S.S. In.Shell outline (Fig. 1 (J)), Quadratotrigonia is, more quadrate being.Truncated at both anterior and posterior ends.This general evolutionary scheme was followed later on by.Many authors (Levy 1966; Pe, pixel rez and Reyes 1977 Fleming 1987;,,;H. Leanza, and Garate-Zubillaga 1987; Cooper 1991; H. Leanza,,1993; Francis and Hallam 2003), although sometimes the taxa.Were grouped under different generic names and some species.Were variably referred to different genera. As, a result the.Myophorellidae remains as one of the unresolved clades within.Trigoniida (Schneider, and Kelly 2014).
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