The prevalence , predominance , and metabolic potentials of Candidatus 1 Prochlorobium terpiosii in the coral-killing sponge , Terpios hoshinota 2 Running title : Dominant cyanobiont in Terpios hoshinota 3

Running title: Dominant cyanobiont in Terpios hoshinota 3 Yu-Hsiang Chen*, Hsing-Ju Chen*, Cheng-Yu Yang, Jia-Ho Shiu, Daphne Z. 4 Hoh, Pei-Wen Chiang, Wenhua Savanna Chow, Chaolun Allen Chen, Tin-Han 5 Shih, Szu-Hsien Lin, Chi-Ming Yang, James Davis Reimer, Euichi Hirose, Budhi 6 Hascaryo Iskandar, Hui Huang, Peter J. Schupp, Chun Hong James Tan, Hideyuki 7 Yamashiro, Ming-Hui Liao, Sen-Lin Tang 8