• Jania Bellardi, 1873 † accepted as Janiopsis Rovereto, 1899 †
• Jania J.V.Lamouroux, 1812
• Jania acicularis Crouan & Croaun, 1868 (uncertain)
• Jania acutiloba (Decaisne) J.H.Kim, Guiry & H.-G.Choi, 2007
• Jania adhaerens J.V.Lamouroux, 1816
• Jania affinis Harvey, 1855
• Jania alasaniensis Maslov (uncertain)
• Jania angulosa (Brocchi, 1814) † accepted as Janiopsis angulosa (Brocchi, 1814) †
• Jania antennina Kützing, 1843 accepted as Jania micrarthrodia J.V.Lamouroux, 1816
• Jania antiqua M'Coy, 1844 † accepted as Cladochonus antiquus (M'Coy, 1844) †
• Jania arborescens (Yendo) Yendo, 1905
• Jania articulata N'Yeurt & Payri, 2009
• Jania bacillaria M'Coy, 1844 † accepted as Cladochonus bacularis (M'Coy, 1844) † accepted as Cladochonus bacillaris (M'Coy, 1844) †
• Jania caespitosa Duchassaing, 1850 (uncertain)
• Jania calvimontensis (Cossmann, 1889) † accepted as Janiopsis calvimontensis (Cossmann, 1889) †
• Jania capillacea Harvey, 1853
• Jania colridusensis Pacaud & A. Leroy, 2015 † accepted as Janiopsis colridusensis (Pacaud & A. Leroy, 2015) †
• 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
• Jania constricta Kützing (uncertain)
• Jania continua Duchassaing, 1850 (uncertain)
• Jania corniculata (Linnaeus) J.V.Lamouroux, 1816 accepted as Jania rubens var. corniculata (Linnaeus) Yendo, 1905
• Jania corniculata var. Lamouroux Meslin (uncertain)
• Jania corniculata var. minima J.V.Lamouroux (uncertain)
• Jania corniculata var. plumula Zanardini
• Jania crassa J.V.Lamouroux, 1821
• Jania crassa M'Coy, 1844 † accepted as Cladochonus crassus (M'Coy, 1844) †
• Jania crassicosta Benoist, 1874 † accepted as Muricopsis crassicosta (Benoist, 1874) †
• Jania crispata (J.V.Lamouroux) Decaisne, 1842 accepted as Jania rosea (Lamarck) Decaisne, 1842
• Jania cristata (Linnaeus) Endlicher (uncertain)
• Jania cubensis Montagne ex Kützing, 1849
• Jania cultrata (Harvey) J.H.Kim, Guiry & H.-G.Choi, 2007
• Jania cuvieri (J.V.Lamouroux) Decaisne, 1842 accepted as Jania rosea (Lamarck) Decaisne, 1842
• Jania decussatodichotoma (Yendo) Yendo, 1905 accepted as Jania adhaerens J.V.Lamouroux, 1816
• Jania dercourtii J.H.Johnson, 1965 †
• Jania digitata Manza, 1937 accepted as Arthrocardia palmata (J.Ellis & Solander) J.E. Areschoug, 1852
• Jania elegans Decaisne, 1842
• Jania fastigiata Harvey, 1849
• Jania fastigiota Harvey accepted as Jania fastigiata Harvey, 1849
• Jania funiculosa (Deshayes, 1835) † accepted as Janiopsis funiculosa (Deshayes, 1835) †
• Jania gibbosa J.V.Lamouroux (uncertain)
• Jania gracilis (J.V.Lamouroux) Montagne, 1845 accepted as Jania rosea (Lamarck) Decaisne, 1842
• Jania gracilis Zanardini, 1844
• Jania granifera J.V.Lamouroux, 1812 accepted as Jania virgata (Zanardini) Montagne, 1846
• Jania guamensis J.H.Johnson (uncertain)
• Jania heberti (Watelet, 1851) † accepted as Janiopsis heberti (Watelet, 1851) †
• Jania hombronii Montagne, 1845 accepted as Corallina hombronii (Montagne) Montagne ex Kützing, 1849
• Jania huertae Chávez, 1972 (uncertain)
• Jania intermedia (Kützing) P.C.Silva, 1996
• Jania iyengarii E.K.Ganesan, 1966
• Jania kuboiensis Ishijima
• Jania labrosa (Bellardi & Michelotti, 1840) † accepted as Janiopsis labrosa (Bellardi & Michelotti, 1840) †
• Jania labrosa var. ventricosissima Sacco, 1890 † (uncertain > unassessed)
• Jania lamourouxiana (Decaisne) J.H.Kim, Guiry & H.-G.Choi, 2007 accepted as Jania sagittata (J.V.Lamouroux) Blainville, 1834
• Jania lemoinei Ishijima
• Jania lesueri Duchassaing, 1850 (uncertain)
• Jania lobata Zanardini, 1858
• Jania longiarthra E.Y.Dawson, 1953
• Jania longifurca Zanardini, 1844
• Jania maxillosa (Bellardi & Michelotti, 1840) † accepted as Janiopsis maxillosa (Bellardi & Michelotti, 1840) †
• Jania maxillosa var. percostata Sacco, 1890 † (uncertain > unassessed)
• Jania maxillosa var. postica Sacco, 1890 † accepted as Janiopsis angulosa (Brocchi, 1814) †
• Jania maxillosa var. subacostulata Sacco, 1890 † (uncertain > unassessed)
• 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 micrarthrodia f. antennina (Kützing) Yendo, 1905 accepted as Jania micrarthrodia J.V.Lamouroux, 1816
• Jania micrarthrodia var. alpha tenuissima (Sonder) Areschoug, 1852 accepted as Jania micrarthrodia J.V.Lamouroux, 1816
• Jania micrarthrodia var. crassa (J.V.Lamouroux) J.E. Areschoug, 1996 accepted as Jania verrucosa J.V.Lamouroux, 1816
• Jania micrarthrodia var. ß antennina (Kützing) Areschoug, 1852 accepted as Jania micrarthrodia J.V.Lamouroux, 1816
• Jania micrarthrodia var. tenuissima (Sonder) Sonder, 1880 accepted as Jania micrarthrodia J.V.Lamouroux, 1816
• Jania minor (Deshayes, 1864) † accepted as Janiopsis minor (Deshayes, 1864) †
• Jania minuta Johansen & Womersley, 1994
• Jania miocenica J.H.Johnson
• Jania natalensis Harvey, 1849 accepted as Jania crassa J.V.Lamouroux, 1821
• Jania natalensis var. tenuior Harvey ex Durairatnam (uncertain)
• Jania natalensis var. tenuior Harvey, 1857 accepted as Jania verrucosa J.V.Lamouroux, 1816
• Jania nipponica (Yendo) Yendo, 1905
• Jania nitidula Meslin, 1976 accepted as Jania rubens var. corniculata (Linnaeus) Yendo, 1905
• Jania novae-zelandiae Harvey, 1855
• Jania nummulitica Lemoine, 1928 †
• Jania occidentalis Johnson & Kaska (uncertain)
• Jania pacifica Areschoug, 1852
• Jania paniculata (J.V.Lamouroux) Decaisne, 1842
• Jania parisiensis (Deshayes, 1834) † accepted as Janiopsis parisiensis (Deshayes, 1834) †
• 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 plicata Benoist, 1874 † (uncertain > unassessed)
• Jania plumula Zanardini, 1844 accepted as Jania rubens var. corniculata (Linnaeus) Yendo, 1905
• 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
• 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