perekond
Ptychoplasma Fenton et Fenton, 1937
Taksoni kirjeldused
Pieńkowski & Uchman, 2009
Diagnosis: In hypichnial aspect, nearly smooth, undulating, continuous to discontinuous subhorizontal ridges that display a characteristically amygdaloid, carinate or blocky cross-section, little or no chevron sculpture, and commonly a straight, winding, irregularly meandering or looping course (Mikuláš, Rindsberg and Uchman, submitted).
Klassifikatsioon