Tag: walrus

Eons Roundup 9

New year, new PBS Eons commission roundup day!

  • An illustration of an extinct early walrus. Unlike modern walruses it has no tusks, more resembling a sea lion in appearance.
    Neotherium mirum
  • An illustration of an extinct species of walrus. It has shorter thicker tusks than modern walruses, and it's depicted grubbing around on a muddy seafloor for buried shellfish.
    Valenictus sp.

The ancient walruses Neotherium and Valenictus, from “How the Walrus Got Its Tusks”
https://www.youtube.com/watch?v=BKDGYGV2LK8

  • An illustration of an extinct nodosaur, a type of quadrupedal herbivorous dinosaur. Its body is covered in densely-packed knobbly spiky armor.
    Borealopelta markmitchelli (life restoration)
  • An illustration of the carcass of an extinct nodosaur, a type of quadrupedal herbivorous dinosaur. Its body is covered in knobbly spiky armor, and its belly is massively bloated up from trapped gasses, forcing it to have turned upside down.
    Borealopelta markmitchelli (“bloat-and-float” carcass)

The nodosaurid ankylosaur Borealopelta, in both alive and “bloat-and-float” carcass states, from “The Dinosaur Who Was Buried at Sea”
https://www.youtube.com/watch?v=a-UZXBF63z4

  • An illustration of an extinct ankylosaur, a type of quadrupedal herbivorous dinosaur. Its body is covered in knobbly spiky armor, but unlike most other ankylosaurids it has no bony club at the tip of its tail.
    Gobisaurus domoculus
  • An illustration of an extinct ankylosaur, a type of quadrupedal herbivorous dinosaur. Its body is covered in knobbly spiky armor, and it has a small bony club at the tip of its tail.
    Dyoplosaurus acutosquameus

The ankylosaurid ankylosaurs Gobisaurus and Dyoplosaurus, from “How Ankylosaurs Got Their Clubs”
https://www.youtube.com/watch?v=lRt-4SdzWrk

Nanodobenus

Nanodobenus arandai, a pinniped from the mid-to late Miocene (~16-9 mya) of Baja California Sur, Mexico. Although it would have looked very similar to a sea lion, it was actually an early member of the walrus lineage that lacked the specialized long tusks that characterize its modern relatives.

At just 1.65m long (5′5″) it was only about half the size of living walruses, making it the smallest member of the group ever discovered and leading to it being given the nickname “smallrus”.

It probably occupied a similar sort of fish-eating ecological niche as true sea lions – which eventually replaced it in the region after its extinction – and since it lived alongside several other larger species of walrus it may have become dwarfed to avoid direct competition with them.