Halymenia a genus of a macroscopic red algae that grows in oceans worldwide. Species have been found in cold temperate areas but the highest diversity is found in warm temperate and tropical regions. For example, 41 names have been reported for the Indo-Pacific (Guiry & Guiry, 2011). Silva et al. (1996) listed 22 names (including two varieties) for the Indian Ocean. Species It includes the following species: Halymenia abyssicola E.Y.Dawson Halymenia actinophysa M.A.Howe Halymenia angusta (J.Agardh) De Toni Halymenia asymmetrica Gargiulo, de Masi & Tripodi Halymenia bifida E.Y.Dawson Halymenia brasiliana S.M.P.B.Guimarães & M.T.Fujii Halymenia californica G.M.Smith & Hollenberg Halymenia carnosa Halymenia cerratei C.O.Acleto Halymenia chiangiana I.A.Abbott & Kraft Halymenia clathrata E.C.Oliveira, Pinheiro-Vieira & R.E.Norris Halymenia cromwellii I.A.Abbott Halymenia curvicornis J.Agardh Halymenia dilatata Zanardini Halymenia dubia Bory de Saint-Vincent Halymenia duchassaingii (J.Agardh) Kylin Halymenia durvillei Bory de Saint-Vincent Halymenia echinophysa F.S.Collins & M.A.Howe Halymenia elongata C.Agardh Halymenia fasciata Bory de Saint-Vincent Halymenia fimbriata Zanardini Halymenia flabellata F.Schmitz Halymenia floresii (Clemente) C.Agardh Halymenia floridana J.Agardh Halymenia foliacea W.R.Taylor Halymenia formosa Harvey ex Kützing Halymenia gardneri (Kylin) P.G.Parkinson Halymenia hancockii W.R.Taylor Halymenia harveyana J.Agardh Halymenia hawaiiana Hernández-Kantun & A.R.Sherwood Halymenia hollenbergii I.A.Abbott Halymenia hvarii Ercegovic Halymenia imbricata Dickie Halymenia integra M.A.Howe & W.R.Taylor Halymenia jelinekii Grunow Halymenia kraftii Womersley & J.A.Lewis Halymenia kuetzingii A.J.K.Millar Halymenia lacerata Sonder Halymenia latifolia P.L.Crouan & H.M.Crouan ex Kützing Halymenia lubrica Suhr Halymenia maculata J.Agardh Halymenia megaspora E.Y.Dawson Halymenia microcarpa (Montagne) P.C.Silva Halymenia mirabilis D.L.Ballantine & H.Ruiz Halymenia muelleri Sonder Halymenia multifida Zanardini Halymenia naegelii Kützing Halymenia nukuhivensis N'Yuert & Payri Halymenia plana Zanardini Halymenia platycarpa (Harvey ex Grunow) J.Agardh Halymenia pluriloba Ercegovic Halymenia polyclada A.Gepp & E.S.Gepp Halymenia porphyraeformis Parkinson Halymenia porphyroides Børgesen Halymenia pseudofloresii F.S.Collins & M.A.Howe Halymenia purpurascens Halymenia pusilla Sonder Halymenia refugiensis E.Y.Dawson Halymenia rhodymenioides Ercegovic Halymenia rosea M.A.Howe & W.R.Taylor Halymenia santamariae W.R.Taylor Halymenia schizymenioides Hollenberg & I.A.Abbott Halymenia stipitata I.A.Abbott Halymenia tenera M.A.Howe Halymenia tenuispina Kützing Halymenia tondoana O.DeClerck & Hernández-Kantun Halymenia utriana W.R.Taylor Halymenia venusta Børgesen Halymenia vinacea M.A.Howe & W.R.Taylor References Florideophyceae Red algae genera Taxa named by Carl Adolph Agardh