''Trenella'' is the sole genus in the Trenellidae, an extinct

family Family (from ) is a Social group, group of people related either by consanguinity (by recognized birth) or Affinity (law), affinity (by marriage or other relationship). It forms the basis for social order. Ideally, families offer predictabili ...

of paleozoic

Yochelcionellid ''Yochelcionella'' is an extinct genus of basal molluscs which lived during the Tommotian Epoch (geology), epoch, the first epoch of the Cambrian period. This genus is often reconstructed to resemble snails. ''Yochelcionella'' is the type genus ...

2005 taxonomy

The taxonomy of the Gastropoda by Bouchet & Rocroi, 2005Bouchet P. & Rocroi J.-P. (Ed.); Frýda J., Hausdorf B., Ponder W., Valdés Á. & Warén A. 2005. ''Classification and nomenclator of gastropod families''. Malacologia: International Journal of Malacology, 47(1-2). ConchBooks: Hackenheim, Germany. . . 397 pp. http://www.vliz.be/Vmdcdata/imis2/ref.php?refid=78278 categorizes Trenellidae in the superfamilia

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

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

Runnegar & Jell, 1976 within the order

Helcionelliformes Helcionellid or Helcionelliformes is an order of small fossil shells that are universally interpreted as molluscs, though no sources spell out why this taxonomic interpretation is preferred. These animals are first found about in the late Nemak ...

Golikov & Starobogatov, 1975, subclass Archaeobranchia Parkhaev, 2001, class

Helcionelloida Helcionelloida is an extinct group of ancient molluscs (phylum Mollusca). 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 ere ...

Peel, 1991.

Genera

Genera in the family Trenellidae include: * ''Trenella'' Parkhaev, 2001 -

type genus In biological taxonomy, the type genus (''genus typica'') is the genus which defines a biological family and the root of the family name. Zoological nomenclature According to the International Code of Zoological Nomenclature, "The name-bearin ...

of the family Trenellidae

References

Helcionelloida Prehistoric invertebrates of Australia Monotypic prehistoric mollusc genera Enigmatic protostome taxa {{paleo-mollusc-stub