• Halacarus Gosse, 1855
• Halacarus (Halacarellus) accepted as Halacarellus Viets, 1927
• Halacarus (Halacarellus) abyssorum accepted as Agaue abyssorum (Trouessart, 1896)
• Halacarus (Polymela)
• Halacarus (Polymela) occultus accepted as Agaue parva (Chilton, 1883)
• Halacarus abyssorum Trouessart, 1896 accepted as Agaue abyssorum (Trouessart, 1896)
• Halacarus actenos Trouessart, 1889
• Halacarus actenos var. robusta Lohmann, 1907 accepted as Halacarus robustus Lohmann, 1907
• Halacarus aculeatus Makarova, 1978 accepted as Thalassarachna aculeata (Makarova, 1978)
• Halacarus aegyptus Viets, 1935
• Halacarus agauoides Lohmann, 1907 accepted as Agaue agauoides (Lohmann, 1907)
• Halacarus alberti Trouessart, 1902 accepted as Bradyagaue alberti (Trouessart, 1902)
• Halacarus alpinus Thor, 1910 accepted as Porohalacarus alpinus (Thor, 1910)
• Halacarus alpinus decaporus Walter, 1919 accepted as Porohalacarus alpinus (Thor, 1910)
• Halacarus alpinus var. doudecimpora Thor, 1923 accepted as Porohalacarus alpinus (Thor, 1910)
• Halacarus anomalus Trouessart, 1894 accepted as Anomalohalacarus anomalus (Trouessart, 1894)
• Halacarus arenarius Bartsch, 1993
• Halacarus areolatus Halbert, 1915 accepted as Halacarellus capuzinus (Lohmann, 1893)
• Halacarus armatus Kramer, 1898 accepted as Halacarellus harioti (Trouessart, 1889)
• Halacarus arnaudi Newell, 1984
• Halacarus atlanticus Bartsch, 1981
• Halacarus australensis Lohmann, 1909 accepted as Copidognathus australensis (Lohmann, 1909)
• Halacarus balgimus Bartsch, 1988
• Halacarus balticus Lohmann, 1889 accepted as Halacarellus balticus (Lohmann, 1889)
• Halacarus basidentatus Trouessart, 1899 accepted as Copidognathus basidentatus (Trouessart, 1899)
• Halacarus basteri Johnston, 1836
• Halacarus basteri affinis Trouessart, 1896 accepted as Thalassarachna affinis (Trouessart, 1896)
• Halacarus bavayi Trouessart, 1896 accepted as Copidognathus bavayi (Trouessart, 1896)
• Halacarus bavayi corallorum Trouessart, 1899 accepted as Copidognathus corallorum (Trouessart, 1899)
• Halacarus bergensis Viets, 1927 accepted as Halacarellus floridearum (Lohmann, 1889)
• Halacarus bisulcus Viets, 1927
• Halacarus borealis Trouessart, 1893
• Halacarus capuzinus Lohmann, 1893 accepted as Halacarellus capuzinus (Lohmann, 1893)
• Halacarus caudani Trouessart, 1896 accepted as Copidognathus caudani (Trouessart, 1896)
• Halacarus celatus Bartsch, 1993
• Halacarus chilcottensis Otto, 2001
• Halacarus coecus Trouessart, 1902 accepted as Thalassarachna coeca (Trouessart, 1902)
• Halacarus crassidens Sokolov, 1952 accepted as Halacarellus schefferi (Newell, 1951)
• Halacarus crassirostris Trouessart, 1901 accepted as Copidognathus crassirostris (Trouessart, 1901)
• Halacarus cribosoma Police, 1909 accepted as Copidognathus cribosoma (Police, 1909)
• Halacarus ctenopus Gosse, 1855
• Halacarus cucullatus Bartsch, 1993
• Halacarus debilis Lohmann, 1907 accepted as Agaue debilis (Lohmann, 1907)
• Halacarus dictyotus Bartsch, 1988
• Halacarus discophorus Bartsch, 1993
• Halacarus drygalskii Lohmann, 1907 accepted as Bradyagaue drygalskii (Lohmann, 1907)
• Halacarus echinatus Newell, 1984
• Halacarus elegans Newell, 1984
• Halacarus excellens Lohmann, 1907
• Halacarus fabricii Lohmann, 1889 accepted as Copidognathus fabricii (Lohmann, 1889)
• Halacarus falklandensis Newell, 1984
• Halacarus flavellus Bartsch, 1993
• Halacarus floridearum Lohmann, 1889 accepted as Halacarellus floridearum (Lohmann, 1889)
• Halacarus frontiporus Newell, 1947
• Halacarus frontispinis Grube, 1872 (uncertain > nomen dubium)
• Halacarus fuscatus Bartsch, 1993
• Halacarus gibbus Trouessart, 1889 accepted as Copidognathus gibbus (Trouessart, 1889)
• Halacarus gibbus britannica Trouessart, 1894 accepted as Copidognathus remipes (Trouessart, 1894)
• Halacarus gibbus cataphractus Trouessart, 1899 accepted as Copidognathus cataphractus (Trouessart, 1899)
• Halacarus gibbus caulifer Trouessart, 1899 accepted as Copidognathus caulifer (Trouessart, 1899)
• Halacarus gibbus majusculus Trouessart, 1894 accepted as Copidognathus majusculus (Trouessart, 1894)
• Halacarus gibbus remipes Trouessart, 1894 accepted as Copidognathus remipes (Trouessart, 1894)
• Halacarus gossei Haller, 1886 (unaccepted)
• Halacarus gracileunguiculatus Lohmann, 1907
• Halacarus gracilipes Trouessart, 1889 accepted as Arhodeoporus gracilipes (Trouessart, 1889)
• Halacarus gracilipes largiforatus Trouessart, 1899 (unaccepted)
• Halacarus gracilipes quadricostatus Trouessart, 1894 (unaccepted)
• Halacarus granulatus Hodge, 1863 accepted as Copidognathus granulatus (Hodge, 1863)
• Halacarus griseus Bartsch, 1987
• Halacarus harioti Trouessart, 1889 accepted as Halacarellus harioti (Trouessart, 1889)
• Halacarus harioti var. kerguelensis Lohmann, 1907 accepted as Halacarellus kerguelensis (Lohmann, 1907)
• Halacarus helenae Bartsch, 1993
• Halacarus hemispinosus Newell, 1984
• Halacarus heraldensis Otto, 2001
• Halacarus hexacanthus Viets, 1927 accepted as Thalassarachna hexacantha (Viets, 1927)
• Halacarus hexacanthus parvus Viets, 1936 (unaccepted)
• Halacarus hexacanthus var. reducta Viets, 1927 accepted as Thalassarachna hexacantha (Viets, 1927)
• Halacarus higginsi Newell, 1984
• Halacarus hispidus Lohmann, 1893 accepted as Agaue hispida (Lohmann, 1893)
• Halacarus humerosus Trouessart, 1896 accepted as Copidognathus humerosus (Trouessart, 1896)
• Halacarus humerosus graveolus Monniot, 1962 (unaccepted)
• Halacarus hydrachnoides Lohmann, 1893 accepted as Porohalacarus hydrachnoides (Lohmann, 1893)
• Halacarus hypertrophicus Lohmann, 1893 accepted as Agaue hypertrophica (Lohmann, 1893)
• Halacarus inermis Trouessart, 1888 (uncertain > nomen dubium)
• Halacarus istrianus Vitzthum, 1932 accepted as Thalassarachna affinis (Trouessart, 1896)
• Halacarus juliani Otto, 2001
• Halacarus kerguelensis Lohmann, 1907 accepted as Copidognathus kerguelensis (Lohmann, 1907)
• Halacarus lamellipes Newell, 1984
• Halacarus lamellosus Lohmann, 1893 accepted as Copidognathus lamellosus (Lohmann, 1893)
• Halacarus lamellosus septentrionalis Halbert, 1915 accepted as Copidognathus septentrionalis (Halbert, 1915)
• Halacarus laterculatus Viets, 1950
• Halacarus latirostris Gimbel, 1919 accepted as Halacarus minor Lohmann, 1907
• Halacarus leptopus Bartsch, 2002
• Halacarus levipes Trouessart, 1889 (uncertain > nomen dubium)
• Halacarus lohmanni Trouessart, 1889 accepted as Copidognathus lohmanni (Trouessart, 1889)
• Halacarus lohmanni Womersley, 1937 accepted as Halacarus propinquus Viets, 1940
• Halacarus longior Bartsch, 1981
• Halacarus longipes (Trouessart, 1888) accepted as Thalassarachna longipes (Trouessart, 1888)
• Halacarus longirostris Trouessart, 1896 accepted as Copidognathus longirostris (Trouessart, 1896)
• Halacarus longiunguis Police, 1909