• Jania Bellardi, 1873 † accepted as Janiopsis Rovereto, 1899 † [Family: Buccinidae]
• Jania J.A. Schultes & J.H. Schultes in J.J. Roemer & J.A. Schultes, 1830 (unaccepted) [Family: Liliaceae]
• Jania J.V.F. Lamouroux, 1812 [Family: Corallinaceae]
• Jania M'Coy, 1844 † (uncertain) [Family: Cnidaria (awaiting allocation)]
• Jania acutiloba (Decaisne) J.H. Kim, Guiry & H.-G. Choi, 2007
• Jania adhaerens J.V. Lamouroux, 1816
• Jania affinis Harvey, 1855
• Jania alasaniensis Maslov
• Jania antennina Kützing, 1843
• Jania arborescens (Yendo) Yendo, 1905
• Jania articulata N'Yuert & Payri, 2009
• Jania capillacea Harvey, 1853
• Jania comosa P.L. Crouan & H.M. Crouan, 1865 accepted as Jania adhaerens J.V. Lamouroux, 1816
• Jania compressa J.V. Lamouroux, 1824 accepted as Jania rosea (Lamarck) Decaisne, 1842 accepted as Haliptilon roseum (Lamarck) Garbary & H.W. Johansen, 1982
• Jania constricta Kützing
• Jania corniculata (Linnaeus) J.V. Lamouroux, 1812 accepted as Jania rubens (Linnaeus) J.V. Lamouroux, 1816
• Jania crassa J.V. Lamouroux, 1821 accepted as Jania verrucosa J.V. Lamouroux, 1816
• Jania crispata (J.V. Lamouroux) Decaisne, 1842 accepted as Jania rosea (Lamarck) Decaisne, 1842 accepted as Haliptilon roseum (Lamarck) Garbary & H.W. Johansen, 1982
• Jania cristata (Linnaeus) Endlicher
• Jania cubensis Montagne ex Kützing, 1849 accepted as Haliptilon cubense (Montagne ex Kützing) Garbary & H.W. Johansen, 1982
• Jania cultrata (Harvey) J.H. Kim, Guiry & H.-G. Choi, 2007
• Jania cuvieri (J.V. Lamouroux) Decaisne, 1842 accepted as Haliptilon roseum (Lamarck) Garbary & H.W. Johansen, 1982
• Jania decussatodichotoma (Yendo) Yendo, 1905
• Jania dercourtii Johnson
• Jania digitata Manza, 1937 accepted as Arthrocardia palmata (J. Ellis & Solander) Areschoug, 1852
• Jania elegans Decaisne, 1842
• Jania fastigiata Harvey, 1849
• Jania fastigiota Harvey
• Jania gibbosa J.V. Lamouroux
• Jania gracilis (J.V. Lamouroux) Montagne, 1845 accepted as Jania rosea (Lamarck) Decaisne, 1842 accepted as Haliptilon roseum (Lamarck) Garbary & H.W. Johansen, 1982
• Jania gracilis Zanardini
• Jania granifera J.V. Lamouroux, 1812 accepted as Halopteris virgata (J.D. Hooker & Harvey) N.M. Adams, 1994
• Jania guamensis J.H. Johnson
• Jania hombronii Montagne, 1845 accepted as Corallina hombronii (Montagne) Montagne ex Kützing, 1849
• Jania huertae Chávez, 1971
• Jania intermedia (Kützing) P.C. Silva, 1996
• Jania iyengarii E.K. Ganesan, 1966
• Jania kuboiensis Ishijima
• Jania lamourouxiana (Decaisne) J.H. Kim, Guiry & H.-G. Choi, 2007 accepted as Jania sagittata (J.V. Lamouroux) Blainville, 1834
• Jania lemoinei Ishijima
• Jania lobata Zanardini, 1858
• Jania longiarthra E.Y. Dawson, 1953
• Jania longifurca Zanardini, 1844
• Jania mayei Johnson
• Jania mengaudii Lemoine
• Jania mexicana W.R. Taylor, 1945 accepted as Jania pacifica Areschoug, 1852
• Jania micrarthrodia J.V. Lamouroux, 1816
• Jania minuta Johansen & Womersley, 1994
• Jania miocenica J.H. Johnson
• Jania natalensis Harvey, 1849 accepted as Jania verrucosa J.V. Lamouroux, 1816
• Jania nipponica (Yendo) Yendo, 1905
• Jania nitidula Meslin, 1976 accepted as Jania rubens (Linnaeus) J.V. Lamouroux, 1816
• Jania novae-zelandiae Harvey, 1855
• Jania nummulitica Lemoine
• Jania occidentalis Johnson & Kaska
• Jania pacifica Areschoug, 1852
• Jania paniculata (J.V. Lamouroux) Decaisne, 1842 accepted as Haliptilon paniculatum (J.V. Lamouroux) Garbary & H.W. Johansen, 1982
• Jania parva Johansen & Womersley, 1994
• Jania parvula Zanardini
• Jania pedunculata J.V. Lamouroux, 1816 accepted as Jania verrucosa J.V. Lamouroux, 1816
• Jania pistillaris Montagne, 1847
• Jania plumula (Zanardnini) Zanardini, 1844 accepted as Jania rubens (Linnaeus) J.V. Lamouroux, 1816
• Jania prolifera (J.V. Lamouroux) J.H. Kim, Guiry & H.-G. Choi, 2007
• Jania prolifera A.B. Joly, 1966
• Jania pulchella (Harvey) Johansen & Womersley, 1994 accepted as Jania affinis Harvey, 1855
• Jania pumila J.V. Lamouroux, 1816
• Jania purpurata (Lamarck) Blainville, 1834
• Jania pusilla (Sonder) Yendo, 1905
• Jania pygmaea J.V. Lamouroux, 1816
• Jania radiata Yendo, 1905
• Jania robusta E.Y. Dawson, 1953 accepted as Jania verrucosa J.V. Lamouroux, 1816
• Jania rosea (Lamarck) Decaisne, 1842 accepted as Haliptilon roseum (Lamarck) Garbary & H.W. Johansen, 1982
• Jania rubens (Linnaeus) J.V. Lamouroux, 1816
• Jania rubra J.V. Lamouroux
• Jania rubrens (L.) Lamour
• Jania sagittata (J.V. Lamouroux) Blainville, 1834
• Jania sanctae-marthae Schnetter, 1972
• Jania santae-marthae Schnetter, 1972
• Jania spectabile (Harvey ex Grunow) J.H. Kim, Guiry & H.-G. Choi, 2007
• Jania spermophorus J.V. Lamouroux, 1812 accepted as Jania rubens (Linnaeus) J.V. Lamouroux, 1816
• Jania squamata (Linnaeus) J.H. Kim, Guiry & H.-G. Choi, 2007
• Jania subpinnata E.Y. Dawson, 1953
• Jania subulata (Ellis & Solander) Sonder, 1848 accepted as Haliptilon subulatum (J. Ellis & Solander) H.W. Johansen, 1970
• Jania tenella (Kützing) Grunow, 1874
• Jania tenuissima Sonder, 1848 accepted as Jania micrarthrodia J.V. Lamouroux, 1816
• Jania toltrica Maslov
• Jania ucrainica Maslov, 1962 †
• Jania ungulata (Yendo) Yendo, 1905
• Jania verrucosa J.V. Lamouroux, 1816
• Jania vetus Johnson
• Jania virgata (Zanardini) Montagne, 1846 accepted as Haliptilon virgatum (Zanardini) Garbary & H.W. Johansen, 1982
• Jania wassoevicii Maslov
• Jania yenoshimensis (Yendo) Yendo, 1905
• Janias Distant, 1910 (uncertain)