Hydractinia

Hydractinia includes 80 children:

• Hydractinia aculeata (Wagner 1833)
• Hydractinia aggregata Fraser 1911
• Hydractinia altispina Millard 1955
• Hydractinia angusta Hartlaub 1904
• Hydractinia apicata (Kramp 1959)
• Hydractinia arctica (Jäderholm 1902)
• Hydractinia arge (Clarke 1882)
• Hydractinia armata Fraser 1940
• Hydractinia carica Bergh 1887
• Hydractinia echinata (Fleming 1828) (Snail fur hydroid)
• Hydractinia galeai Calder & Watling 2021
• Hydractinia gelinea Watson 2015
• Hydractinia ingolfi Kramp 1932
• Hydractinia kaffraria Millard 1955
• Hydractinia leizhouensis Huang, Zhang & Yang 2020
• Hydractinia monocarpa Allman 1876
• Hydractinia parvispina Hartlaub 1905
• Hydractinia polyclina L. Agassiz 1860
• Hydractinia valens Fraser 1943
• Hydractinia vallini Jäderholm 1926
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