El problema del taxón Sipunculus gravieri (Hérubel, 1904a) y la descripción de una nueva especie para el género Xenosiphon (Sipuncula, Sipunculidae)

Resum

The problem of the taxon Sipunculus gravieri (Hérubel, 1904a) and descnption of a new
species for the genus Xenosiphon (Sipuncula, Sipunculidae).
The study of the specimens deposited in the Paris Museum as Sipunculus gravieri, shows that some of them must be considered as a new species.