A basic problem in our knowledge of the aplacophoran molluscs, viz. the Caudofoveata and the Solenogastres, is the poor availability of faunistic samplings. This lacunarity even concerns the European waters; in the present contribution, particular attention is paid to the gap in the records along the French and Iberian shelf regions. This is underlined by presenting an updated geographic distribution of eight caudofoveate and thirteen solenogastre species. Benthos investigators are called upon to focus more intensively on sampling the smaller marine fauna from mobile bottoms of the West-European shelf regions