Thuiaria is a genus of hydroids in the family Sertulariidae.^[1]

The following species are classed in this genus:^[1]

• Thuiaria abyssicola (Billard, 1925)
• Thuiaria acutiloba Kirchenpauer, 1884
• Thuiaria allmani (Norman, 1878)
• Thuiaria alternans Naumov, 1952
• Thuiaria alternitheca Levinsen, 1893
• Thuiaria arctica (Bonnevie, 1899)
• Thuiaria articulata (Pallas, 1766)
• Thuiaria bidentata (Allman, 1876)
• Thuiaria breitfussi (Kudelin, 1914)
• Thuiaria carica Levinsen, 1893
• Thuiaria cedrina (Linnaeus, 1758)
• Thuiaria constans (Fraser, 1948)
• Thuiaria cornigera Kudelin, 1914
• Thuiaria coronifera Allman, 1876
• Thuiaria cupressoides (Lepechin, 1783)
• Thuiaria cylindrica Clark, 1876
• Thuiaria deberki Kudelin, 1914
• Thuiaria decemserialis (Merezhkovskii, 1878)
• Thuiaria diffusa (Allman, 1885)
• Thuiaria excepticea Fenyuk, 1947
• Thuiaria gonorhiza Naumov, 1952
• Thuiaria hartlaubi (Nutting, 1904)
• Thuiaria hippuris Allman, 1874
• Thuiaria insociabilis Fraser, 1948
• Thuiaria invicea Naumov, 1960
• Thuiaria involuta Naumov, 1960
• Thuiaria kudelini Naumov, 1960
• Thuiaria kurilae Nutting, 1904
• Thuiaria laxa Allman, 1874
• Thuiaria lebedi Naumov, 1960
• Thuiaria mereschkowskii Kudelin, 1914
• Thuiaria nivea Fenyuk, 1947
• Thuiaria obsoleta (Lepechin, 1781)
• Thuiaria ochotensis (Mereschkowsky, 1878)
• Thuiaria operculata Watson, 2000
• Thuiaria pinaster (Lepechin, 1783)
• Thuiaria pinna Naumov, 1960
• Thuiaria plumiformis (Nutting, 1904)
• Thuiaria plumularioides Watson, 2000
• Thuiaria purpurea (Linnaeus, 1758)
• Thuiaria sachalini Kudelin, 1914
• Thuiaria stelleri Kirchenpauer, 1884
• Thuiaria subthuja (Fenyuk, 1947)
• Thuiaria tetrastriata Naumov, 1960
• Thuiaria thuja (Linnaeus, 1758)
• Thuiaria trilateralis (Fraser, 1936)
• Thuiaria triserialis (Merezhkovskii, 1878)
• Thuiaria uschakovi Naumov, 1960
• Thuiaria wulfiusi Naumov, 1960
• Thuiaria zachsi Fenyuk, 1947