Coryne fucicola (de Filippi, 1866) has been considered a somewhat problematic species of unknown origin and whose last records date back more than a century. However, a living colony was recently rediscovered at Roscoff and the species is redescribed in this report. It is evidently a valid species and clearly distinct from other similar species like Coryne pusilla and C. muscoides. This was also confirmed using 16S sequence data. The relationship to the similarly problematic C. vermicularis Hincks, 1866 is discussed and the status of the latter re-evaluated by an examination of the type material. Coryne vermicularis appears distinct from C. fucicola, but its relationship to C. pusilla remains unclear. Pending a detailed comparison of living material, it is advised not to synonymize C. vermicularis and C. pusilla.
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