Fuseudoxid: the elusive sexual stage of the calycophoran siphonophore Crystallophyes amygdalina Moser, 1925 (Clausophyidae: Crystallophyinae)

We have identified the sexual stage of the calycophoran siphonophore Crystallophyes amygdalinaMoser, 1925 and it appears to be closely related to the undescribed Eudoxia X. In both of these sexual stages, the bract and gonophore have become fused together as a single entity. This new type of siphonophoran sexual stage warrants the creation of a particular terminology and here we name it a fuseudoxid (fused eudoxid). To demonstrate these findings, both fuseudoxids are described, and their phylogenetic relationships as well as the systematic position of the genus Crystallophyes are discussed. The subfamily Crystallophyinae Moser (1925) is re-established.