Yochelcionelloidea is an extinct superfamily of paleozoic molluscs of uncertain position (Gastropoda

Gastropoda

The Gastropoda or gastropods, more commonly known as snails and slugs, are a large taxonomic class within the phylum Mollusca. The class Gastropoda includes snails and slugs of all kinds and all sizes from microscopic to quite large...

 or Monoplacophora

Monoplacophora

Monoplacophora, meaning "bearing one plate", is a polyphyletic class of mollusks with a cap-like shell, living on the bottom of deep sea. Extant representatives were unknown until 1952; previously they were known only from the fossil record.- Definition :...

). The earliest yochelcionellids are known from the Middle Tommotian, but they are most diverse from the Botomian through the early Middle Cambrian.

2005 taxonomy

The taxonomy of the Gastropoda by Bouchet & Rocroi, 2005

Taxonomy of the Gastropoda (Bouchet & Rocroi, 2005)

The taxonomy of the Gastropoda as it was revised by Philippe Bouchet and Jean-Pierre Rocroi is currently the most up-to-date overall system for classifying gastropod mollusks...

:

Yochelcionelloidea

• † Yochelcionellidae
• † Stenothecidae
  Stenothecidae
  Stenothecidae is an extinct family of univalved Cambrian molluscs. .- Morphology :...
  
  
• † Trenellidae
  Trenellidae
  Trenella is the sole genus in Trenellidae, an extinct family of paleozoic Yochelcionellids.- 2005 taxonomy :The taxonomy of the Gastropoda by Bouchet & Rocroi, 2005 categorizes Trenellidae in the superfamilia Yochelcionelloidea within the...
  
  

2006-2007 taxonomy

According to the opinion of P. Yu. Parkhaev is in the class Helcionelloida

Helcionelloida

Helcionelloida is the name given to an extinct group of ancient molluscs . These are the oldest known conchiferan molluscs, that is, they had a mineralised shell. Some members of this class were mistaken for Monoplacophorans. The class was erected by Peel in 1991.-Anatomy:These animals were...

, subclass Archaeobranchia Parkhaev, 2001, Order Helcionelliformes Golikov & Starobogatov, 1975:

• Superfamily Yochelcionelloidea Runnegar & Jell, 1976

• Family Trenellidae
  Trenellidae
  Trenella is the sole genus in Trenellidae, an extinct family of paleozoic Yochelcionellids.- 2005 taxonomy :The taxonomy of the Gastropoda by Bouchet & Rocroi, 2005 categorizes Trenellidae in the superfamilia Yochelcionelloidea within the...
  
   Parkhaev, 2001
• Family Yochelcionellidae Runnegar & Jell, 1976
• Family Stenothecidae
  Stenothecidae
  Stenothecidae is an extinct family of univalved Cambrian molluscs. .- Morphology :...
  
   Runnegar & Jell, 1980

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