The morphology and internal anatomy of the caudofoveate Falcidens vasconiensis Salvini-Plawen, 1996, are described and a 3D reconstruction of its anatomy is made with the program AVIZO 6.3.1. The detailed body shape, additional sclerite types, digestive

The shell-less, worm-shaped Caudofoveata (=Chaetodermomorpha) is one of the least known groups of molluscs. The taxon consists of 141 recognized species found from intertidal environments to the deep-sea where they live burrowing in sediment. Evolutionary

The organization of the central nervous system of an "aplacophoran" mollusc, Chaetoderma japonicum, is described as a means to understand a primitive condition in highly diversified molluscan animals. This histological and immunocytochemical study revealed