Dodatak:Popis sisavaca, I

Ia

Ia Thomas, 1902

• Ia io, Thomas, 1902

Mammalia → Chiroptera → Microchiroptera → Vespertilionidae → Vespertilioninae → Vespertilionini

Ic

, Ichneumia , Ichthyomys , Ictidomys

Ictonyx Kaup, 1835

• Ictonyx libycus (Hemprich and Ehrenberg, 1833)
• Ictonyx libycus libycus (Hemprich and Ehrenberg, 1833)
• Ictonyx libycus multivittatus (Wagner, 1841)
• Ictonyx libycus oralis (Thomas and Hinton, 1920)
• Ictonyx libycus rothschildi (Thomas and Hinton, 1920)
• Ictonyx striatus (Perry, 1810)
• Ictonyx striatus albescens Heller, 1913
• Ictonyx striatus arenarius Roberts, 1924
• Ictonyx striatus elgonis Granvik, 1924
• Ictonyx striatus erythreae de Winton, 1898
• Ictonyx striatus ghansiensis Roberts, 1932
• Ictonyx striatus giganteus Roberts, 1932
• Ictonyx striatus intermedius Anderson and de Winton, 1902
• Ictonyx striatus kalaharicus Roberts, 1932
• Ictonyx striatus lancasteri Roberts, 1932
• Ictonyx striatus limpopoensis Roberts, 1917
• Ictonyx striatus maximus Roberts, 1924
• Ictonyx striatus obscuratus de Beaux, 1924
• Ictonyx striatus orangiae Roberts, 1924
• Ictonyx striatus ovamboensis Roberts, 1951
• Ictonyx striatus pretoriae Roberts, 1924
• Ictonyx striatus senegalensis (J. B. Fischer, 1829)
• Ictonyx striatus shoae Thomas, 1906
• Ictonyx striatus shortridgei Roberts, 1932
• Ictonyx striatus striatus (Perry, 1810)

Mammalia → Carnivora → Mustelidae

Id

, Idionycteris , Idiurus

In

†Indarctos Pilgrim 1913

• †Indarctos anthracitis Weithofer 1888
• †Indarctos arctoides Deperet 1895
• †Indarctos atticus Weithofer 1888
• †Indarctos nevadensis Macdonald 1959
• †Indarctos oregonensis Merriam 1925
• †Indarctos salmontanus Pilgrim 1913
• †Indarctos vireti Villalta and Crusafont 1943
• †Indarctos zdanskyi Qiu and Tedford 2003

Mammalia → Carnivora → Caniformia → Ursidae → Ursinae → Ursavini , Indopacetus , Indri

Porodica Indricotheriidae Borissiak 1923

• Rodovi: Benaratherium, Dzungariotherium, Indricotherium, Paraceratherium

Mammalia → Perissodactyla → Tapiromorpha → Ceratomorpha → Rhinocerotoidea

†Indricotherium Borissiak 1916

• †Indricotherium qujingensis Tang 1978
• †Indricotherium transouralicum Pavlova 1922

Animalia → Chordata → Mammalia → Perissodactyla → Indricotheriidae , Indridae , Inia , Iniidae

Io

, Iomys

Ir

, Irenomys

Is

, Isolobodon , Isoodon , Isothrix , Isthmomys