Although Solenogastres molluscs are not rare animals, knowledge of this group is very incomplete since information on its biology, diversity and geographical distribution is still limited and unequal. Over the last few decades, however, research on their morphological and organizational diversity has increased considerably, and the systematics has been modified. For this reason, this contribution summarizes the diagnoses of all families and genera, and compiles a list of the species with information about their holotype, distribution and the most recent literature. The holotype of Anamenia heathi Leloup, 1947, is designated as neotype of Neomenia gorgonophila Kowalevsky, 1880.