Euthyneura


Euthyneura is a taxonomic clade of snails and slugs, which includes species from freshwater, marine, aquatic and terrestrial gastropod mollusks in the clade Heterobranchia.
Euthyneura are considered the crown group of Gastropoda, and are characterised by several autapomorphies, but are named for euthyneury. They are considered to be the most successful and diverse group of Gastropoda. Within this taxon, the Gastropoda have reached their peak in species richness and ecological diversity. This obvious evolutionary success can probably be attributed to several factors. Marine Opisthobranchia, e.g., have evolved several clades specialised on less used food resources such as sponges or cnidarians. A key innovation in the evolution of Pulmonata was the colonization of freshwater and terrestrial habitats.
, a pleurobranch with the gill on the right side.
Various phylogenetic studies focused on Euthyneura: Dayrat et al., Dayrat & Tillier and Grande et al.. Morphological analyses by Dayrat and Tillier demonstrated the need to explore new datasets in order to critically analyse the phylogeny of this controversial group of gastropods. Klussmann-Kolb et al.'' traced an evolutionary scenario regarding colonisation of different habitats based on phylogenetic hypothesis and they showed that traditional classification of Euthyneura needs to be reconsidered.

2010 taxonomy

Jörger et al. have redefined major groups within the Heterobranchia and a cladogram showing phylogenic relations of Euthyneura is as follows:

2014 taxonomy

showing phylogenic relations of Euthyneura sensu Wägele et al. :

2016 taxonomy

Kano et al. proposed a new taxon Ringipleura and classified Ringiculoidea as sister group to Nudipleura: