• Leptognathia abyssi (Hansen, 1913)
• Leptognathia abyssorum (Dollfus, 1897)
• Leptognathia acanthifera Hansen, 1913
• Leptognathia alba Hansen, 1913
• Leptognathia amdrupi Hansen, 1913
• Leptognathia amdrupii Hansen, 1913 accepted as Leptognathia armata Hansen, 1913
• Leptognathia aneristus Bird, 2007
• Leptognathia angusta (G.O. Sars, 1882)
• Leptognathia angustocephala Kudinova-Pasternak, 1975
• Leptognathia antarctica (Vanhöffen, 1914)
• Leptognathia arctophylax (Norman & Stebbing, 1886)
• Leptognathia armata Hansen, 1913
• Leptognathia arnaudi G.O. Sars, 1882 accepted as Collettea arnaudi (Shiino, 1978)
• Leptognathia arnaudi Shiino, 1980
• Leptognathia arnaudii Shiino, 1978
• Leptognathia australis accepted as Leptognathia gracilis (Kröyer, 1842)
• Leptognathia australis Beddard, 1886
• Leptognathia bamberi Larsen & Shimomura, 2007
• Leptognathia birsteini Kudinova-Pasternak, 1965
• Leptognathia brachiata Hansen, 1913
• Leptognathia brevimana Bird & Holdich, 1984 accepted as Araphura brevimanus Lilljeborg, 1864
• Leptognathia brevimanu Nierstrasz & Schuurmans Stekhoven, 1930 accepted as Araphura brevimanus Lilljeborg, 1864
• Leptognathia brevimanus (Lilljeborg, 1864)
• Leptognathia breviremis accepted as Tanaopsis graciloides (Lilljeborg, 1864)
• Leptognathia breviremis (Lilljeborg, 1864)
• Leptognathia breviremoides Sieg, 1986
• Leptognathia caeca
• Leptognathia caudata Kudinova-Pasternak, 1965 accepted as Paranarthrurella caudata (Kudinova-Pasternak, 1965)
• Leptognathia coeca (Harger, 1978) accepted as Salemia caeca (Harger, 1878)
• Leptognathia crassa Hansen, 1913
• Leptognathia crassimana Dollfus, 1898 accepted as Tanaissus lilljeborgi (Stebbing, 1891)
• Leptognathia dentata accepted as Leptognathia dentifera G.O. Sars, 1899
• Leptognathia dentifera G.O. Sars, 1899
• Leptognathia dissimilis Lang, 1972
• Leptognathia distincta Kudinova-Pasternak, 1981
• Leptognathia diversa Sieg, 1983
• Leptognathia elegans Kudinova-Pasternak, 1965
• Leptognathia elongata Shiino, 1970
• Leptognathia filiformis Lilljeborg, 1864
• Leptognathia filum (Stimpson, 1853) accepted as Pseudoleptochelia filum (Stimpson, 1853)
• Leptognathia forcifera Lang, 1968
• Leptognathia forcipatus
• Leptognathia gallardoi Shiino, 1970
• Leptognathia glacialis Hansen, 1913
• Leptognathia glandiceps Shiino, 1978
• Leptognathia gracilis (Kröyer, 1842)
• Leptognathia graciloides accepted as Tanaopsis graciloides (Lilljeborg, 1864)
• Leptognathia grevae Kudinova-Pasternak, 1977
• Leptognathia greveae Kudinova-Pasternak, 1976
• Leptognathia gyreae Larsen, 2005
• Leptognathia hanseni Vanhoffen, 1907 accepted as Leptognathia gracilis (Kröyer, 1842)
• Leptognathia hastata Hansen, 1913 accepted as Leptognathia armata Hansen, 1913
• Leptognathia indivisa (Hansen, 1913)
• Leptognathia inermis Hansen, 1913
• Leptognathia islandicus accepted as Leptognathia gracilis (Kröyer, 1842)
• Leptognathia langi Kudinova-Pasternak, 1970
• Leptognathia laticaudata G.O. Sars, 1882 accepted as Tanaopsis graciloides (Lilljeborg, 1864)
• Leptognathia latiremis Hansen, 1913
• Leptognathia lilljeborgi accepted as Tanaissus lilljeborgi (Stebbing, 1891)
• Leptognathia linearis (Hansen, 1913)
• Leptognathia lineata Shiino, 1978
• Leptognathia longa (Kudinova-Pasternak, 1982)
• Leptognathia longimanus Larsen, 2005
• Leptognathia longiremis accepted as Leptognathia gracilis (Kröyer, 1842)
• Leptognathia longiremis (Lilljeborg, 1864)
• Leptognathia longiremus (Lilljeborg, 1864)
• Leptognathia luykeni Vanhöffen, 1914
• Leptognathia manca G.O. Sars, 1882
• Leptognathia microcephala Kudinova-Pasternak, 1978
• Leptognathia mironovi Kudinova-Pasternak, 1981
• Leptognathia multiserrata Hansen, 1913
• Leptognathia ochracea (Hansen, 1913)
• Leptognathia oculata (Vanhoeffen, 1914) accepted as Paratanais oculatus (Vanhöffen, 1914)
• Leptognathia parabranchiata Kudinova-Pasternak, 1978
• Leptognathia parabrevimana Lang, 1968
• Leptognathia parabrevimanu Lang, 1968 accepted as Araphura parabrevimanus (Lang, 1968)
• Leptognathia parabreviremis Sieg
• Leptognathia paraforcifera Lang, 1968
• Leptognathia paramanca Lang, 1958
• Leptognathia parelegana Kudinova-Pasternak, 1970
• Leptognathia parelegans Kudinova-Pasternak, 1970
• Leptognathia polita Hansen, 1913
• Leptognathia profunda Hansen, 1913
• Leptognathia rectifrons Kudinova-Pasternak, 1973
• Leptognathia rigida (Bate & Westwood, 1868) accepted as Paratanais rigidus Bate & Westwood, 1868
• Leptognathia robusta Kudinova-Pasternak, 1970 accepted as Robustochelia robusta (Kudinova-Pasternak, 1970)
• Leptognathia rotundicauda Kudinova-Pasternak, 1970
• Leptognathia sarsi Hansen, 1909 accepted as Leptognathia gracilis (Kröyer, 1842)
• Leptognathia savignyi accepted as Leptochelia dubia Krøyer, 1842
• Leptognathia subaequalis Hansen, 1913
• Leptognathia tenella Hansen, 1913
• Leptognathia tuberculata Hansen, 1913
• Leptognathia uncifera accepted as Leptognathia uncinata Hansen, 1913
• Leptognathia uncinata Hansen, 1913
• Leptognathia unguicillata (Norman & Stebbing, 1886)
• Leptognathia unguicillata Lang, 1968 accepted as Tanaella unguicillata Norman & Stebbing, 1886 accepted as Leptognathia unguicillata (Norman & Stebbing, 1886)
• Leptognathia vanhoeffeni Guțu, 1972
• Leptognathia ventralis Hansen, 1913
• Leptognathia vicina Hansen, 1913 accepted as Pachygnathia vicina (Hansen, 1913)
• Leptognathia vinogradovae Kudinova-Pasternak, 1970