Pyramidelloidea

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.
Distribution.
This taxon is found worldwide.
Taxonomy.
1999 taxonomy.
Taxonomy by Schander, Van Aartsen & Corgan (1999):
2005 taxonomy.
Pyramidelloidea has been classified within the informal group Lower Heterobranchia in the taxonomy of Bouchet & Rocroi (2005).
Taxonomy of Bouchet & Rocroi, 2005:
2010 taxonomy.
Jörger et al. (2010) have redefined major groups within the Heterobranchia and they moved Pyramidelloidea to Panpulmonata.