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Pycnosteus is an extinct genus of jawless fish from the Devonian period. these ancient aganathans probably cruised through the primal vegetation, eating any small invertebrates it displaces.

An artist’s reconstruction of the 410-million-year-old armoured jawless fish Rhegmaspis xiphoidea. Image credit: Zhi-Kun Gai et al. / Dimitris Siskopoulos / Sci-News.com.

The 410 million year old jawless fish Rhegmaspis xiphoidea by Zhi-Kun Gai and Dimitris Siskopoulos

Hybodus and Ichtyosaurus by ~dustdevil on deviantART

Hybodus scavenging on Ichtyosaurus carcass by dustdevil on DeviantArt

Art illustration - Aquatic Animals - Belantsea: is an extinct genus of holocephalans the order petalodontiformes, which emerged in the Carboniferous Period, and disappeared into the Permian-Triassic extinction event.

Art illustration - Aquatic Animals - Belantsea: is an extinct genus of holocephalans the order petalodontiformes, which emerged in the Carboniferous Period, and disappeared into the Permian-Triassic extinction event.

Xiphactinus (from Latin and Greek for "sword-ray") is an extinct genus of large, 4.5 to 6 m (15 to 20 feet) long predatory marine bony fish that lived during the Late Cretaceous.

Xiphactinus (from Latin and Greek for "sword-ray") is an extinct genus of large, to 6 m to 20 feet) long predatory marine bony fish that lived during the Late Cretaceous.

Astraspis desiderata | Spinops

A digital illustration of Astraspis desiderata, an extinct genus of primitive jawless fish, by Nobu Tamura

The extinct Pikaia gracilens, the most primitive known member of the chordate family — our 500 million year old ancestor!

Pikaia gracilens, our earliest ancestor because it is the earliest chordate (animal w/ a notochord/ backbone) — our 500 Ma old ancestor!

Earth Archives | When monsters ruled the water: The Age of Fishes

It was a time when the oceans and rivers of the world were ruled by aliens with armored bodies and slicing bony blades in their mouths. Welcome to the Devonian, the Age of Fishes, when these creatures were at the height of their strangeness.

Cryptoclidus: Middle Jurassic (166 – 164 Ma ): Sauropterygia (Plesiosauria): Discovered by Seeley, 1892: Artist unknownj

LIOPLEURODON was the biggest plesiosaur. Liopleurodon was not a dinosaur, but a short-necked plesiosaur (a pliosaur), an extinct, swimming reptile. It lived during the late Jurassic period in Europe and Eastern Europe.

Whalevolution Month #09 – Makaracetus Makaracetus was such an unusual protocetid that it’s been classified in own unique little subfamily, the makaracetinae. Probably around 3-4m long (9′10″-13′), and living about 47 million years ago in Pakistan, it’s notable for having a skull unlike any of its relatives – with a large nasal opening, a downward-turned snout, and huge attachment points for facial muscles.

alphynix: Whalevolution Month – Makaracetus Makaracetus was such an unusual protocetid that it’s been classified in own unique little subfamily, the makaracetinae.

Albertonectes (plesiosaurio elasmosáurido del Cretácico de Canadá, 70mA) (Julius Csotonyi)

Albertonectes in the Bearpaw Sea Around 74 million years ago, Albertonectes was the ultimate "stretch-limo" of a group of prehistoric reptiles called plesiosaurs. It hunted fish with a neck possessing over ten times as many vertebrae as ours!

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