Pyramidelloidea

Pyramidelloidea

Two views of a shells of Pyramidella acus
Scientific classification
Kingdom:	Animalia
Phylum:	Mollusca
Class:	Gastropoda
Clade:	Heterobranchia
Clade:	Euthyneura
Order:	Panpulmonata
Superfamily:	Pyramidelloidea J. E. Gray, 1840

Pyramidelloidea is a superfamily of mostly very small sea snails, marine gastropod mollusks and micromollusks within the clade Panpulmonata.

This is a voluminous taxon: above the species level close to 400 named taxa are referred to this gastropod superfamily.

Pyramidelloidea has both fossil and recent members. They live as ectoparasites on bivalve molluscs and polychaete worms, and have a sharp, piercing stylet instead of a radula.

This taxon is found worldwide.

Taxonomy by Schander, Van Aartsen & Corgan (1999):

Pyramidelloidea has been classified within the informal group Lower Heterobranchia in the taxonomy of Bouchet & Rocroi (2005).

Taxonomy of Bouchet & Rocroi, 2005:

Jörger et al. (2010) have redefined major groups within the Heterobranchia and they moved Pyramidelloidea to Panpulmonata.