Dodatak:Popis žarnjaka, H
Ha uredi
- Habrosanthus
- Hadalanthus
- Halammohydra
- Halammohydridae
- Halcampa
- Halcampactis
- Halcampaster
- Halcampella
- Halcampidae
- Halcampogeton
- Halcampoides
- Halcampoididae
- Halcurias
- Halcuriidae
- Haleciidae
- Halecium
- Haliactiidae
- Haliactis
- Halianthella
- Haliclystus
- Halicornopsis
- Halicreas
- Halicreatidae
- Halimedusa
- Halimedusidae
- Halimocyathus
- Haliplanella
- Haliplanellidae
- Halipteridae
- Halipteris
- Haliscera
- Halisiphonia
- Halistemma
- Halitholus
- Halitiara
- Halitiarella
- Halitrephes
- Halmomises
- Haloclava
- Haloclavidae
- Halocoryne
- Halomitra
- Halopsis
- Halopterididae
- Halopteris
- Hansiella
Haootia Liu et al., 2014 uredi
- Haootia quadriformis Liu et al., 2014 nova vrsta[1]
- Harenactis
- Hartlaubella
- Hataia
He uredi
- Hebella
- Hebellidae
- Helgicirrha
- Heliania
- Helicogorgia
- Helicoprimnoa
- Heliofungia
- Heliolitina
- Heliopathes
- Heliopora
- Helioporacea
- Helioporidae
- Helioseris
- Hensenanthula
- Heptaprimnoa
- Heptarradiata
- Herpolitha
- Heteractis
- Heteranthus
- Heterocoryne
- Heterocyathus
- Heterodactyla
- Heterogorgia
- Heteropolypus
- Heteropsammia
- Heteropyramis
- Heterotentacula
- Heterotentaculidae
- Heteroxenia
- Hexapathes
- Hexaphilia
Hi uredi
- Hicksonella
- Hillopathes
- Hincksella
- Hippopodiidae
- Hippopodius
- Hippurella
Ho uredi
- Holcotrochus
- Homoeonema
- Homophyton
- Hoplangia
- Horastrea
- Hormathia
- Hormathianthus
- Hormathiidae
- Hormosoma
Hy uredi
- Hybocodon
- Hydnophora
- Hydra
- Hydractinia
- Hydractiniidae
- Hydrallmania
- Hydranthea
- Hydrichthella
- Hydrichthyidae
- Hydrichthys
- Hydridae
- Hydrissa
- Hydrocorella
- Hydrocoryne
- Hydrocorynidae
- Hydrodendron
Podrazred Hydroidolina Collins, 2000 uredi
- Anthoathecata Cornelius, 1992
- Leptothecata Cornelius, 1992
- Siphonophorae Eschscholtz, 1829
Razred Hydrozoa Owen, 1843 uredi
- Hydroidolina Collins, 2000
- Trachylinae Haeckel, 1879
- Hypnogorgia
- Hypopyxis