Trenella is the sole genus in Trenellidae, an extinct family

Family

In human context, a family is a group of people affiliated by consanguinity, affinity, or co-residence. In most societies it is the principal institution for the socialization of children...

 of paleozoic Yochelcionellids.

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...

 categorizes Trenellidae in the superfamilia Yochelcionelloidea

Yochelcionelloidea

Yochelcionelloidea is an extinct superfamily of paleozoic molluscs of uncertain position . 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 &...

 within the
Paleozoic molluscs of uncertain systematic position. This family has no subfamilies.

2006-2007 taxonomy

According to P. Yu. Parkhaev, the family Trenellidae is in the superfamily Yochelcionelloidea

Yochelcionelloidea

Yochelcionelloidea is an extinct superfamily of paleozoic molluscs of uncertain position . 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 &...

 Runnegar & Jell, 1976 within the order Helcionelliformes Golikov & Starobogatov, 1975, subclass Archaeobranchia Parkhaev, 2001, 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...

 Peel, 1991.

Genera

Genera in the family Trenellidae include:

• Trenella Parkhaev, 2001 - type genus
  Type genus
  In biological classification, a type genus is a representative genus, as with regard to a biological family. The term and concept is used much more often and much more formally in zoology than it is in botany, and the definition is dependent on the nomenclatural Code that applies:* In zoological...
  
  of the family Trenellidae