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Approximately 29 species of  Neosiphonia  are currently recognized worldwide. We describe our unidentified samples collected from the Pacific coast of South America as a new species,  N. peruviensis  sp. nov., based on morphological and molecular data.  Neosiphonia peruviensis  sp. nov. is characterized by erect and prostrate thalli, rhizoids cut off from proximal ends of pericentral cells by cross walls, six pericentral cells that are totally ecorticate, abundant trichoblasts forked once or twice, prominent scar cells and tetrasporangia spirally arranged. Our new species is similar to several  Neosiphonia / Polysiphonia  species having more than four pericentral cells:  N. notoensis ,  N. porrecta ,  “N. tepida” ,  N. teradomariensis,  and  “P. forfex” . However,  N. peruviensis  sp. nov. is distinguished from these similar species by having six pericentral cells through all of the thallus. Phylogenetic analyses of  rbc L indicate that our  N. peruviensis  is placed in genus  Neosiphonia  and is also distinguishable from other  Neosiphonia  species.

Neosiphonia peruviensis sp. nov. (Rhodomelaceae, Rhodophyta) from the Pacific coast of South America