St. Martin’s Reef (SMR) about 14 km west of the Island, Teknaf, Cox’s Bazar, Bangladesh was not known during last over 50 years seaweed researches. Recent six collections made with assistance Navy revealed 8 seaweeds species which are Pterocladiella maribagoensis Boo and Geraldo, Hypnea spinella (C. Agardh) Kützing, Peyssonnelia polymorpha (Zonars.) Schmitz, Jania pumila Lamx., ungulata f. brev...