Yochelcionelloidea

Yochelcionelloidea is an extinct superfamily of paleozoic molluscs of uncertain position (Gastropoda or Monoplacophora).^[1] The earliest yochelcionellids are known from the Middle Tommotian, but they are most diverse from the Botomian through the early Middle Cambrian.^[2]

Yochelcionelloidea Temporal range: Lower Cambrian–Mid Cambrian PreꞒ Ꞓ O S D C P T J K Pg N
Yochelcionella cyrano
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	†Helcionelloida
Order:	†Helcionelliformes
Superfamily:	†Yochelcionelloidea Runnegar & Jell, 1976

2005 taxonomy

The taxonomy of the Gastropoda by Bouchet & Rocroi, 2005:

Yochelcionelloidea

• † Yochelcionellidae
• † Stenothecidae
• † Trenellidae

2006-2007 taxonomy

According to the opinion of P. Yu. Parkhaev is in the class Helcionelloida, subclass Archaeobranchia Parkhaev, 2001, Order Helcionelliformes Golikov & Starobogatov, 1975:^[3][4]

• Superfamily Yochelcionelloidea Runnegar & Jell, 1976

• Family Trenellidae Parkhaev, 2001
• Family Yochelcionellidae Runnegar & Jell, 1976
• Family Stenothecidae Runnegar & Jell, 1980

• Subfamily Stenothecinae Runnegar & Jell, 1980
• Subfamily Watsonellinae Parkhaev, 2001