Ia
Iacra H. Adams & A. Adams, 1856
- Iacra japonica A. Adams, 1864
- Iacra kallima (A. E. Salisbury, 1934)
- Iacra petiti Dautzenberg, 1923
- Iacra seychellarum (A. Adams, 1856)
- Iacra speciosa (Deshayes, 1856)
- Iacra trotteriana (Sowerby III, 1894)
Mollusca → Bivalvia → Euheterodonta → Veneroida → Tellinoidea → Semelidae
Ic
- Ichthyomenia
- Icuncula
Id
- Idas
†Iddingsia Olsson 1929
- †Iddingsia intermedia Palmer 1965
- †Iddingsia laeviusculum Gabb 1869
Gastropoda → Sorbeoconcha → Cerithiidae
- Idiopoma
- Idiopyrgus
- Idiosepiidae
- Idiosepius
- Idioteuthis
If
- Ifremeria
Ig
- Iglica
Ih
- Iheringella
Il
- Ilbia
- Ilbiidae
- Ildica
- Iliochione
- Illex
- Ilyanassa
Im
- Imaclava
- Imbricaria
- Imeroherpia
- Imeroherpiidae
- Impages
In
- Inbiocystiscus
- Incertihydrobia
Podred Incirrata
- Argonautoidea Cantraine, 1841
- Octopodoidea d'Orbigny, 1840
Mollusca → Cephalopoda → Coleoidea → Octopodiformes → Octopoda
- Indoaustriella
- Indocrassatella
- Indomitrella
- Indoplanorbis
- Indothais
- Inella
- Infundibulops
- Infundibulum
- Ingensia
- Inglisella
- Iniforis
Inkinga Kilburn, 1988
- Inkinga carnosa Kilburn, 2005
- Inkinga cockae (Kilburn, 1977)
- Inkinga platystoma (E. A. Smith, 1877)
Mollusca → Gastropoda → Caenogastropoda → Neogastropoda → Conoidea → Horaiclavidae
- Innesoconcha
- Inodrillia
- Inopinodon
Inozonites Pfeffer, 1883
- Inozonites orthostoma (Pfeiffer, 1845)
Mollusca → Gastropoda → Pulmonata → Helicarionoidea → Helicarionidae → Helicarioninae
- Inquisitor
- Insignia
- Insullaoma
- Intelcystiscus
- Inversidens
- Inversunio
Io
Io Lea, 1831
- Io fluvialis (Say, 1825). (ugrožena)
Mollusca → Gastropoda → Cerithioidea → Pleuroceridae
- Iolaea
- Iothia
- Iotula
- Iotyrris
Ip
- Iphigenia
- Iphinopsis
- Iphitus
- Ipsa
Ir
- Iravadia
- Iravadiidae
- Iredalea
- Iredaleoconcha
- Iredalula
- Irenosyrinx
- Iridinidae
- Irus
- Irusella
Is
- Isanda
Ischadium Jukes-Browne, 1905
- Ischadium recurvum (Rafinesque, 1820)
Mollusca → Bivalvia → Pteriomorphia → Mytiloida → Mytiloidea → Mytilidae
- Ischnochiton
- Ischnochitonidae
- Ischnoplax
- Iselica
- Isidorella
- Islamia
- Isoconcha
- Isodaphne
- Isodontocardia
- Isognomon
- Isomonia
- Isorropodon
- Isotriphora
Isseliella Weinkauff, 1881
- Isseliella incisa (Laseron, 1956) [1]
- Isseliella mirabilis (Weinkauff, 1881) [1]
Mollusca → Gastropoda → Littorinimorpha → Rissooidea → Zebinidae → Stosiciinae
- Issina
- Istriana
It
- Ithycythara
Iv
- Ivara
Iw
- Iwaoa