| Specie | Geographic Information | Accession number |
| Outgroup | ||
| G. curtissiae J. Agardh | La Encrucijada, Venezuela | AY049333 |
| G. dominguensis (Kützing) Sonder ex Dickie | Bahia, Urucuca, Serra Grande, Brazil | KP210223 |
| Ingroup | ||
| Gracilariopsis andersonii (Grunow) E. Y. Dawson | Gwaii Haanas, Ramsey Island, British Island, Canada | KU382057 |
| Gp. carolinensis L. M. Liao & Hommersand | Wilmington, North Carolina, USA | AY049412 |
| Gp. cata-luziana Gurgel, Fredericq & J. N. Norris | Anton Lizardo, Veracruz, Gulf of Mexico, Mexico | AY049406 |
| Gp. changii S.-M. Lin | Sail Rock, Kenting National Park, Taiwan | DQ119746 |
| Gp. chorda (Holmes) Ohmi | Awaji Island, Japan | FJ235527 |
| Gp. chorda | Jindo, Hoidong, South Korea | DQ095785 |
| Gp. chorda | Shimoda, Shizouka | EU567347 |
| Gp. costaricensis E. Y. Dawson | Guanacaste, Nicoya Peninsula, southern of Playa Tamarindo, Costa Rica | AY049423 |
| Gp. funicularis Iyer, Bolton & Coyne | Swakopsmund, Namibia | AY049410 |
| Gp. heteroclada J.-F. Zhang & B.-M. Xia | Dapdap, Bulusan, Luzon, Phillipines | AY049411 |
| Gp. heteroclada | Hainan, China | JQ026028 |
| Gp. hommersandii Gurgel, Fredericq & J. N. Norris | Los Roques Archipelago, Los Francisky Island, Venezuela | AY049408 |
| Gp. irregularis (I. A. Abbott) N. Muangmai, A. Chirapart & A. Lewmanomont | Ao Len, Trat Province, Thailand | KC465784 |
| Gp. lemaneiformis (Bory de Saint-Vincent) E. Y. Dawson, Acleto & Foldvik | Guandong, China | JQ407670 |
| Gp. lemaneiformis | Guandong, China | JQ407672 |
| Gp. lemaneiformis | Guandong, China | JQ407673 |
| Gp. lemaneiformis | Eten, Chiclayo, Lambayeque, Peru | KP857574 |
| Gp. lemaneiformis | Ancon, Lima, Peru | KP857576 |
| Gp. lemaneiformis | Ancon, Lima, Peru | EU158089 |
| Gp. lemaneiformis | Yacilla, Paita, Piura, Peru | AY049415 |
| Gp. lemaneiformis | San Andres, Pisco, Ica, Peru | KP857575 |
| Gp. lemaneiformis | Ecuador | JQ843363 |
| Gp. longissima (S. G. Gmelin) Steentoft, L. M. Irvine & Farnham | Le Theven, Santec, France | DQ241579 |
| Gp. longissima | Venetian Lagoon, Italy | AY049404 |
| Gp. longissima | United Kingdom | JQ843364 |
| Gp. mclachlanii Buriyo, Bellorin & M. C. Oliveira | Pangamkungu, Tanzania | EU158092 |
| Gp. megaspore E. Y. Dawson | South Australia, Robe, Lake Buttler, Australia | AY049422 |
| Gp. nhatrangensis NhuHau Le & S.-M. Lin | Nhatrang City, Vietnam | DQ119744 |
| Gp. persica Bellorin, Sohrabipour & E. C. Oliveira | Bandarabbas, Persian Gulf, Iran | EU158094 |
| Gp. silvana Gurgel, Fredericq & J. N. Norris | La Vela de Coro, Falcon State, Venezuela | AY049309 |
| Gp. tenuifrons (C. J. Bird & E. C. Oliveira) Fredericq & Hommersand | La Pena, Araya, Venezuela | JQ843368 |
| Gp. tenuifrons | Alagoas, Maceio, Lago de Mundau, Brazil | JQ843367 |
| Gp. tenuifrons | Ilet Caret, Guadeloupe, French West Indies | AY049418 |
| Gp. tenuifrons | Arya Peninsula, Sucre, Venezuela | AY049417 |