Dinosaurs That Start With I

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Explore a complete list of over 25 dinosaurs that start with the letter I.

Each dinosaur listed has a dedicated page with information on classification, diet, size, fossil evidence, geographic distribution, and maps of known fossil locations, where available. Pages may also include size comparison charts, fossil representations, and in-depth descriptions based on current scientific research.

The amount of information varies by species, depending on the completeness of fossil discoveries.

Iberospinus

Diet: Piscivore/Carnivore.Size: Uncertain due to lack of remains.Time Period: Barremian of the Cretaceous.

Ibirania

Diet: Herbivore.Size: Holotype estimated to have been about‭ ‬5.7‭ ‬meters long.Time Period: Santonian to Campanian of the Cretaceous.
Ichthyovenator

Ichthyovenator

Diet: Piscivore.Size: Uncertain,‭ ‬but estimated between the region of‭ ‬7.5‭ to ‬9‭ ‬meters long. Later estimates possibly up to 10 meters long.Time Period: Aptian of the Cretaceous.

Iguanacolossus

Diet: Herbivore.Size: Roughly estimated around 9 to‭ ‬10‭ ‬meters long.Time Period: Barremian of the Cretaceous.

Iguanodon

Diet: Herbivore.Size: Specimens seem to average around the‭ ‬10‭ ‬meter long mark,‭ ‬but some individuals are possibly as large as‭ ‬13‭ ‬meters long.Time Period: Kimmeridgian of the Jurassic through to the Barremian/Aptian of the Cretaceous.‭ ‬Some specimens from some parts of the world suggest as late as the Cenomanian of the Cretaceous.

Iliosuchus

Diet: Carnivore.Size: Roughly estimated to be about‭ ‬1.5‭ ‬meters long.Time Period: Bathonian of the Jurassic.

Ilokelesia

Diet: Carnivore.Size: Roughly estimated up to about 5.5 to 6 meters long.Time Period: Cenomanian of the Cretaceous.

Imperobator

Diet: Carnivore.Size: Unknown due to lack of remains.Time Period: Maastrichtian of the Cretaceous.

Incisivosaurus

Diet: Herbivore/Omnivore.Size: Skull‭ ‬10‭ ‬centimetres long.‭ ‬Body estimated to be about‭ ‬1‭ ‬meter long.Time Period: Barremian of the Cretaceous.

Indosaurus

Diet: Carnivore.Size: Uncertain due to lack of fossil remains.Time Period: Maastrichtian of the Cretaceous.

Indosuchus

Diet: Carnivore.Size: At least ‬6‭ ‬meters long.Time Period: Maastrichtian of the Cretaceous.

Ingentia

Diet: Herbivore.Size: Roughly about 7.5 meters long for holotype individual.Time Period: Norian/Rhaetian of the Triassic.

Invictarx

Diet: Herbivore.Size: Uncertain.Time Period: Campanian of the Cretaceous.

Irisosaurus

Diet: Herbivore.Size: Uncertain due to lack of fossil remains,‭ ‬but roughly estimated to be about‭ ‬5.5‭ ‬meters long.Time Period: Early Jurassic.

Irritator

Diet: Carnivore.‭Size: Estimated at‭ ‬8‭ ‬meters long Skull estimated at‭ ‬84‭ ‬centimetres long.Time Period: Albian of the Cretaceous.

Isaberrysaura

Diet: Herbivore.Size: Uncertain.Time Period: Bajocian of the Jurassic.

Isanosaurus

Diet: Herbivore.Size: Estimated to about‭ ‬6.5‭ ‬meters long.Time Period: Norian/Rhaetian of the Triassic.

Isasicursor

Diet: Herbivore.Size: Roughly up to‭ ‬4.75‭ meters ‬long.Time Period: Campanian/Maastrichtian of the Cretaceous.

Ischioceratops

Diet: Herbivore.Size: Uncertain.Time Period: Late Cretaceous.
Isisaurus

Isisaurus

Diet: Herbivore.Size: Total size uncertain due to incomplete remains,‭ ‬but at least about‭ ‬14-15‭ ‬meters long for the holotype individual.‭ ‬Holotype individuals humerus‭ ‬148‭ ‬centimetres long,‭ ‬and Ulna‭ ‬80‭ ‬centimetres long.Time Period: Maastrichtian of the Cretaceous.

Issi

Diet: Herbivore.Size: Skull‭ ‬24.37‭ ‬centimetres long.Time Period: Norian of the Triassic.
Istiorachis

Istiorachis

Diet: HerbivoreSize: 5.5 meters in lengthTime Period: Barremian age of the Early Cretaceous

Itapeuasaurus

Diet: Herbivore.Size: Uncertain.Time Period: Cenomanian of the Cretaceous.

Itemirus

Diet: Carnivore.Size: Unknown.Time Period: Turonian of the Cretaceous.

Iuticosaurus

Diet: Herbivore.Size: Unknown due to overall lack of fossils.Time Period: Barremian of the Cretaceous.