KBS4 BC10 Fungiidae Halomitra pilues Lobactis scutaria a Herpolitha limax Heterocyathus sp 85 Oulastrea crispata KBS1 BC05 Fungiidae Psammocora stellata

83 Psammocora haimiana Anomastraea irregularis 92 Coscinaraea monile KBS5 BC02 Fungiidae Leptastrea transversa Podabacea crustacea Coscinaraea exesa 76 Sandalolitha robusta KBS3 BC06 Fungiidae KBS3 BC11 Fungiina Cladocora caespitosa Oculina diffusa 82 84 Acropora chesterfieldensis Oculina patagonica Acropora aculeus Agaricia humilis 90 Leptoseris yabei Acropora granulosa 83 Leptoseris hawaiiensis Acropora valida 96 Leptoseris fragilis Acropora lutkeni Gardineroseris planulata 97 Acropora sekale Pavona varians 79 KBS4 BC03 Acropora kimbeensis 86 KBS5 BC08 Pavona Acropora kimbeensis 76 Pavona cactus 77 Pavona venosa 100 KBS1 BC10 Acropora muricata 76 89 Helioseris cucullata Acropora muricata 94 Siderastrea savignyana Acropora nasuta Balanophyllia imperialis 83 Acropora cerealis Turbinaria mesenterina Acropora cytherea Turbinaria heronensis 96 Acropora abrotanoides Eguchipsammia serpentina 82 75 Heteropsammia cochlea b KBS1 BC11 Acropora microclados Cladopsammia eguchii Acropora microclados Balanophyllia europaea Acropora polystoma Dendrophyllia cornigera 96 8197 Acropora nana Astroides calycularis 76 Leptopsammia pruvoti Acropora downingi KBS5 BC12 Porites Acropora horrida 100 Porites rus Acropora tortuosa 100 Porites prufundus 89 Acropora abrolhosensis KBS1 BC01 Porites 89 KBS1 BC07 Acropora multiacuta KBS2 BC01 Porites 97 Acropora multiacuta KBS2 BC02 Porites 98 KBS3 BC05 Porites Acropora roseni KBS5 BC09 Porites KBS1 BC12 Acropora roseni 91 KBS4 BC12 Porites Acropora gemmifera KBS4 BC04 Porites Acropora humilis 90 76 KBS3 BC12 Porites KBS1 BC02 Acropora aspera KBS4 BC05 Porites 96 Porites fontanesii Acropora aspera Goniopora spC Isopora brueggemanni 98 Goniopora spA 85 Isoporacuneata 97 Goniopora spB Montipora patula Stylaraea punctata Montipora australiensis Deltocyathus sp 99 Montipora stellata 85 Cariophyllia sp 86 Plesiastrea versipora Montipora aequiturbeculata 82 Madrepora sp Montipora spongodes Cynarina lacrymalis Montipora circumvallata Echinophyllia echinata Montiporafaveolata Symphyllia erythraea 9377 Montipora venosa Echinophyllia echinoporoides 88 Montipora meandrina 75 KBS4 BC09 Lobophyllia 92 Montipora caliculata 86 Lobophyllia robusta Lobophyllia corymbosa Montipora cf verrucosa

84 KBS3 BC07 Symphyllia Alveopora spA Oxypora glabra Alveopora spongiosa Acanthastrea rotundoflora 75 77 Alveopora spB Acanthastrea echinata KBS2 BC10 Diploastrea heliopora Alveopora spC Diploastrea heliopora Montastraea cavernosa 0.5 Meandrina meandrites 94 Eusmilia fastigiata

98 Blastomussa loyae Nemenzophyllia turbida 93 Physogyra lichtensteini 82 Plerogyra sinuosa KBS4 BC11 Merulinidae 83 KBS4 BC07 Merulinidae Dipsastraea rotumana Leptoria phrygia 87 KBS3 BC09 Platygyra 93 Platygyra daedalea KBS5 BC11 Oulophyllia Oulophyllia crispa 82 Favites pentagona 76 Mycedium sp Hydnophora exesa 88 Astrea curta Paragoniastrea russelli Merulina triangularis 87 KBS5 BC05 Goniastrea 92 KBS3 BC04 Goniastrea retiformis Goniastrea retiformis 83 KBS4 BC08 Cyphastrea Mycetophyllia lamarckiana Mussa angulosa Isophyllia sinuosa 82 Isophyllastrea rigida Mycetophyllia aliciae 76 Scolymia sp

98 Galaxea astreata 100 Euphyllia glabrescens Coeloseris mayeri KBS2 BC06 Pocillopora

82 KBS5BC04 Pocillopora KBS1 BC09 Pocillopora KBS1 BC08 Pocillopora KBS2 BC08 Pocillopora 76 KBS2 BC05 Pocillopora 94 KBS2 BC04 Pocillopora 99 KBS2 BC03 Pocillopora KBS1 BC06 Pocillopora Pocillopora acuta 100 Pocillopora damicornis Pocillopora verrucosa 93 KBS3 BC08 Pocillopora Stylophora pistillata 100 Seriatopora sp KBS3 BC10 Seriatopora Truncatoflabellum sp 100 Flabellum sp Stephanocoenia michelini Mycetophyllia danaana KBS2 BC11 Millepora KBS2 BC12 Millepora

100 KBS2 BC09 Millepora KBS1 BC03 Millepora 0.02 Millepora sp1 KBS1 BC04 Millepora 92 Millepora sp2 Supplementary Figure S2: Maximum Likelihood phylogenetic tree of coral 18S rRNA sequences. Sequences reconstructed in this study together with all 18S rRNA sequences from Arrigoni et al. 2018 are represented (12). (a) All corals except Acroporidae. (b) All Acroporidae 18S rRNA.