Helcionelloida - Helcionellida - Helcionellidae

Alternative combinations: Pseudopatella undulata, Scenella undulata

Synonym: Palaeacmaea bella He and Yang 1982

Full reference: W. Yu. 1981. New earliest Cambrian monoplacophorans and gastropods from W. Hubei and E. Yunnan. Acta Palaeontologica Sinica 20(6):552-556

Belongs to Asiapatella according to P. Y. Parkhaev and Y. Demidenko 2010

Sister taxon: Asiapatella sinuata

Type specimens:

• Asiapatella undulata: NIGPAS, no. 65013. Its type locality is Tianzhushan, upper bed, which is in a Meishucunian marine phosphorite in the Huangshandong Formation of China.
• Palaeacmaea bella:

Ecology: slow-moving low-level epifaunal detritivore