Ic
Icasterias Fisher, 1923
- Icasterias panopla (Stuxberg, 1879)
Echinodermata → Asteroidea → Forcipulatida → Asteriidae
Iconaster Sladen, 1889
- Iconaster elegans Jangoux, 1981
- Iconaster longimanus (Möbius, 1859)
- Iconaster uchelbeluuensis Mah, 2005
- Iconaster vanuatuensis Mah, 2005
Echinodermata → Asteroidea → Valvatida → Goniasteridae
Ih
Iheringiella Berg, 1898 †
Echinodermata → Echinoidea → Clypeasteroida → Scutellina → Scutellina incertae sedis
In
Indianastra O'Loughlin in O'Loughlin & Waters, 2004
- Indianastra inopinata (Livingstone, 1933)
- Indianastra sarasini (deLoriol, 1897)
Echinodermata → Asteroidea → Valvatida → Asterinidae
Ir
Irpa Danielssen & Koren, 1878
- Irpa abyssicola Danielssen & Koren, 1879
Echinodermata → Holothuroidea → Elasipodida → Elpidiidae
Is
Red Isocrinida
- Podred Isocrinina
- Podred Pentacrinitina †
Echinodermata → Crinoidea → Articulata
Isopatagus Mortensen, 1948
- Isopatagus obovatus Mortensen, 1948
Echinodermata → Echinoidea → Spatangoida → Micrasteridae → Cyclasterinae , Isostichopus