Abstract
The study of numerous fossil solitary forms of Streptelasmatina (Coelenterata, Rugosa) and some ones belonging to different suborders from the Devonian of the Cantabrian Mountains (NW Spain), shows the importance of such organisms concerning the relations among the major faunal provinces during the Devonian time. The analysis of the Devonian Rugose coral fauna(from Emsian to Frasnian) lets to establish the paleobiogeographical relations of the Cantabrian genera. Particularly, during the Lower Devonian (Emsian) the relationships between the Eastern of North America and Spain would be closer than it was supposed until now. The evidence on the world distribution of thestudied forms suggest possible migration roads.
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