Dinosaurs That Start With Y

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

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.

Yamaceratops

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

Yamanasaurus

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

Yamatosaurus

Diet: Herbivore.Size: Uncertain due to lack of remains,‭ ‬but very roughly estimated to be about‭ ‬7.5‭ ‬meters long.Time Period: Early Maastrichtian of the Cretaceous.

Yandusaurus

Diet: Herbivore.Size: At least three meters long for the holotype,‭ ‬possibly as much as somewhere between‭ ‬3.5‭ ‬and‭ ‬4‭ ‬meters.Time Period: Bathonian of the Jurassic.

Yangchuanosaurus

Diet: Carnivore.Size: Largest individuals estimated up to‭ ‬10.8‭ ‬meters long.Time Period: Bathonian/Callovian of the Jurassic..

Yaverlandia

Diet: Herbivore.Size: Unknown.Time Period: Hauterivian of the Cretaceous.

Yehuecauhceratops

Diet: Herbivore.Size: Holotype roughly about‭ ‬3‭ ‬meters long.‭Time Period: Campanian of the Cretaceous.
Yi

Yi

Diet: Insectivore/Carnivore.Size: ‭Wingspan roughly about 60 centimetres across.Time Period: Callovian/Oxfordian Jurassic.

Yimenosaurus

Diet: Herbivore.Size: Roughly about‭ ‬9‭ ‬meters long.Time Period: Hettangian of the Jurassic.
Yinlong

Yinlong

Diet: Herbivore.Size: 1.2‭ ‬meters long.Time Period: Oxfordian of the Jurassic.
Yixianosaurus

Yixianosaurus

Diet: Uncertain. Possibly an Insectivore.Size: Estimated at possibly up to one meter long.Time Period: Barremian of the Cretaceous.

Yizhousaurus

Diet: Herbivore.Size: Roughly about‭ ‬7‭ ‬meters long for the holotype.Time Period: Early Jurassic.

Yongjinglong

Diet: Herbivore.Size: Uncertain.‭ ‬The holotype fossils are from an incomplete individual,‭ ‬but one that is estimated to have been about‭ ‬15-18‭ ‬meters long.‭ ‬Evidence suggests however that this specimen is of a juvenile or subadult and not a fully grown adult,‭ ‬therefor the true adult size remains unknown.Time Period: Early Cretaceous.

Ypupiara

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

Yuanchuavis

Diet: Uncertain.Size: Unavailable.Time Period: Early Cretaceous.

Yuanmousaurus

Diet: Herbivore.Size: About‭ ‬17‭ ‬meters long.Time Period: Mid Jurassic.‭

Yueosaurus

Diet: Herbivore.Size: Estimated‭ ‬1.5‭ ‬meters long.Time Period: Aptian to Cenomanian of the Cretaceous.

Yulong

Diet: Omnivore‭?Size: Up to‭ ‬50‭ ‬centimetres long.Time Period: Late Cretaceous.

Yunmenglong

Diet: Herbivore.Size: Roughly estimated to be about 20 meters long.Time Period: Aptian/Albian of the Cretaceous.

Yunnanosaurus

Diet: Herbivore.Size: Yunnanosaurus huangi estimated at about‭ ‬7‭ ‬meters long,‭ ‬Yunnanosaurus youngi estimated at about‭ ‬13‭ ‬meters long.Time Period: Y.‭ ‬huangi is known from the Hettangian/Sinemurian of the Jurassic,‭ ‬while Y.‭ ‬youngi is Aalenian/Bajocian of the Jurassic.

Yunyangosaurus

Diet: Carnivore.Size: Uncertain,‭ ‬but roughly estimated at about‭ ‬4.7‭ ‬meters long.Time Period: Mid Jurassic.

Yuornis

Diet: Uncertain.Size: Unavailable.Time Period: Maastrichtian of‭ ‬the Cretaceous.

Yurgovuchia

Diet: Carnivore.Size: Roughly estimated around‭ ‬2.5‭ ‬meters long.Time Period: Barremian of the Cretaceous.
Yutyrannus

Yutyrannus

Diet: Carnivore.Size: Estimated at‭ ‬9‭ ‬meters long.‭ ‬Skullestimated around‭ ‬905‭ ‬millimetres long.Time Period: Aptian of the Cretaceous.

Yuxisaurus

Diet: Herbivore.Size: Estimated about‭ ‬4‭ ‬meters long.Time Period: Sinemurian-Toarcian of the Jurassic.