Ilyograpsus rhizophorae – synonym of Ilyograpsus paludicola
Ilyoplax ceratophora – synonym of Tmethypocoelis ceratophora
Ilyoplax delsmani serrata – synonym of Ilyoplax serratus
Ilyoplax deschampi – synonym of Ilyoplax deschampsi
Ilyoplax integra – synonym of Ilyoplax integer
Ilyoplax pusilla – synonym of Ilyoplax pusillus
Ilyoplax serrata – synonym of Ilyoplax serratus
Inachoides magdalensis – synonym of Pyromaia tuberculata
Inachoides tuberculatus – synonym of Pyromaia tuberculata
Inachus (Achaeus) japonicus – synonym of Achaeus japonicus
Inachus (Elamene) unguiformis – synonym of Trigonoplax unguiformis
Inachus (Macrocheira) Kaempferi – synonym of Macrocheira kaempferi
Inachus (Oncinopus) Aranea – synonym of Oncinopus aranea
Inachus arabicus – synonym of Menaethius monoceros
Inachus longipes – synonym of Phalangipus longipes
Inachus tuberculatus – synonym of Pyromaia tuberculata
Iphis heptacantha – synonym of Arcania heptacantha
Iphis septemspinosa – synonym of Arcania septemspinosa
Isolapotamon (Nanhaipotamon) formosanum globosum – synonym of Nanhaipotamon globosum
Ixa sp. – synonym of Arcania cornuta
Ixoides cornutus – synonym of Arcania cornuta