Table S1. Details of collections examined in this study. S= Subtidal; ND= No Data. Sequence ID separates each specimen in a collection/herbarium number with multiple specimens. Species Herbarium Voucher ID ID Collector Collection date Locality Habitat rbcL GenBank number psbA GenBank number Lithophyllum kaiseri Isolectotype NY 0045463 - ND ND Egypt, El Tor (Gulf of Suez) Subtidal KX020467 - Holotype collection of L. congestum TRH A23-1381 in US TRH A23-1381 TRH A23-1381 S8 S13 S15 Goes 1867 Caribbean Antilles, St. Barthelemy ND KX020468 KX020469 KX020470 - Holotype collection of L. daedaleum NY 00945458 - M.A. Howe no. 2676 29-Jun-1903 Puerto Rico, Salinas Bay. epilithic exposed low intertidal KX020471 - US 169407 - W.H. Adey 12-Jan-1973 St. Croix , Lamb cove, East of the Island. Subtidal, to 3 m depth - KX020446 US 170945 S38 W.H. Adey 17-Oct-1972 St. Croix, East Point Subtidal, to 3 m depth KX020473 KX020449
US 170945 S35 W.H. Adey 17-Oct-1972 St. Croix, East Point. Subtidal, to 3 m depth KX020472 KX020447 US 170945 S61 W.H. Adey 17-Oct-1972 St. Croix , East Point Subtidal, to 3 m depth - KX020460 US 170944 - W.H. Adey 17-Oct-1972 St. Croix, East Point Subtidal, to 3 m depth - KX020448 US 169405 - W.H. Adey 29-Dec-1972 St. Croix, Mt. Fancy Point Subtidal, to 3 m depth KX020474 - US 169408 - W.H. Adey 10-Feb-1966 Jamaica, South Port Royal Subtidal, to 3 m KX020475 KX020456 US 169411 S51 Kuhlmann Jul-1966 Cuba, Km 14, road between Matanzas and Varadero Subtidal, to 3 m depth KX020476 KX020458 US 169411 S52 Kuhlmann Jul-1966 Cuba: Km 14, road between Matanzas and Varadero Subtidal, to 3 m depth KX020477 KX020459 US 170947 - W.H. Adey 10 Nov 1974 Martinique, Pinsonelle ridge Subtidal, to 3 m depth - KX020461 US 169409 - R. Steneck May-1978 Australia, Queensland, One Tree Island Subtidal - KX020462
US 169410 - R. Steneck May-1978 Australia, Queensland, One Tree Island Subtidal - KX020463 NCU 607187 - W. Schmidt, D. Gabriel & T. Sauvage 9-May-2012 Egypt, Nabq, Sharm el Sheikh Subtidal, to 7 m depth KX020478 - NCU 636554 - W. Schmidt, D. Gabriel & T. Sauvage 9-May-2012 Egypt: Nabq, Sharm el Sheikh KX020479 - PC0165991 - L. Le Gall May-2010 Madagascar, Toliara province Subtidal - KX020445 Lithophyllum neocongestum sp. nov. Holotype US 223011 B. Wysor 6-Aug-2010 Panama, Bocas del Toro, off Shark Hole Point, Peninsula Valiente Subtidal, to 2 m depth KX020484 KX020466 Isotype NCU 598862 B. Wysor 6-Aug-2010 Panama, Bocas del Toro, off Shark Subtidal, to 2 m depth KX020485 -
Hole Point, Peninsula Valiente US 169412 R. Burke May 1977 Barbados Subtidal KX020486 KX020457 US 170968 N. Robinson, J.J. Panama, Bocas del Toro, Flat Rock Beach Subtidal, 3-5 m depth - KX020440 US 170967 N. Robinson, J.J. Panama, Bocas del Toro, Sand Fly Bay Subtidal, to 2-3 m depth - KX020441 Lithophyllum platyphyllum Holotype TRH P.T. Cleve No date St. Martin, Guadeloupe, Caribbean Antilles No data KX020481 - US 170946 S46 W.H. Adey 29-Oct-1972 St Croix, Great Pond Bay, Milford Point. Subtidal, to 3 m depth KX020482 KX020455 US 170946 S43 W.H. Adey 29-Oct-1972 St Croix, Great Pond Bay, Milford Point. Subtidal, to 3 m depth - KX020452
US 170946 S44 W.H. Adey 29-Oct-1972 St Croix, Great Pond Bay, Milford Point. Subtidal, to 3 m depth KX020483 KX020453 Lithophyllum sp. nov. Holotype US 170943 - W.H. Adey St East Point Subtidal, to 3 m depth KX020480 KX020454 US 169406 S40 W.H. Adey 28-Dec-1972 St Croix, Robin Bay, robin Point. Subtidal, to 3 m depth - KX020450 US 169406 S41 W.H. Adey 28-Dec-1972 St Croix, Robin Bay, robin Point. Subtidal, to 3 m depth - KX020451 Lithophyllum stictaeforme US 170969 - J.J. 12-Sep-2011 Greece, Voula, Voula Beach Subtidal, to 2.5 m depth - KX020442 TSB - LTP complex 1b - L. Pezzolesi 9-Jun-2014 Italy, Sciusciaù, Gallinara Island, Alassio Subtidal, 30 m depth - KX020443 TSB - LTP complex 11e - ND 4-June-2013 Italy, Tremiti Islands Subtidal - KX020465 TSB - LTP complex 12d - S. Kaleb Italy, Trezza Bardelli, Gulf of Trieste Subtidal, 21 m - KX020444