The solenogastres (less commonly referred to as Neomeniomorpha) are a subclass of shell-less molluscs (Aplacophora), the other subclass being the Caudofoveata (Chaetodermomorpha). The most recent literature, and recent molecular evidence however consider Aplacophora to be polyphyletic and therefore divide Solenogastres and Caudofoveata into separate classes (for example Todt et al 2008) In contrast to all other molluscan classes, the Aplacophora lack a shell, and are instead covered by aragoni… (More on Neomeniomorpha)