Abstract
Abstract Gayralia brasiliensis Pellizzari, M.C. Oliveira et N.S. Yokoya (Gayraliaceae Ulotrichales), a new record for Indian waters, is described based on morphological, anatomical, and molecular characterization. Gayralia brasiliensis was growing luxuriantly towards the upper limit of the intertidal zone at Shirgaon Creek, Maharashtra, west coast of India. The thalli were pale green in color, growing mat-like on muddy substrata. Juvenile thalli were attached to pneumatophores of mangroves, and barnacles, as well as on polyethylene sheets through a rhizoidal disc. The molecular characterization verifies the presence of G. brasiliensis in western India. We observed overlapping morphological traits between G. brasiliensis and G. oxysperma. However, the ITS sequence showed 100 % similarity with no nucleotide divergence to Brazilian G. brasiliensis. The phylogenetic analysis based on ITS rDNA sequence showed that G. brasiliensis from Shirgaon Creek forms a sister lineage to G. oxysperma.
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