27
Oct
Himantolophus groenlandicus skeleton - Atlantic footballfish
via scientificillustration20
Oct
20
Sep
Walrus by BioDivLibrary on Flickr.
[Die vergleichende Osteologie /.
Bonn :In Commission bei Eduard Weber,1821-1838..
biodiversitylibrary.org/page/40170574
via mudwerks11
Sep
Dennis Diderot
Human Arteries 1751
10
Jul
via theonlymagicleftisart05
Jul
03
Jul
02
Jul
FInal for my Animal Anatomy final. I had an independent study with the wonderful and talented Al Gury.
Sketch from the old master “Napoleon Crossing the Alps” by Jacques- Louis David, with my skeleton overlay on vellum over it.
I had a lot of fun doing these studies for Al and he taught me a lot about the comparison between animal and human anatomy.
(Source: vulfolaic)
01
Jul
Jaws of a biting cat compared to a sabretooth cat. Sabretooth cat skulls were designed for a swift downward strike of the sabre-teeth, not a strong bite. The coronoid process was also greatly reduces, meaning the jaws were weakly bound to the skull and couldn’t withstand much bending or twisting.
30
Jun
older vs modern reconstructions
Helicoprion (“Spiral Saw”) was a long-lived genus of shark-like cartilaginous fish that first arose in the oceans of the late Carboniferous 280 million years ago, survived the Permian-Triassic Extinction Event, and eventually went extinct during the early Triassic, 225 million years ago.
The only fossils known are the teeth, which were arranged in a fantastic “tooth-whorl” strongly reminiscent of a circular saw. It was not until the discovery of the skull of a relative, Ornithoprion, that it was realized that the tooth-whorl was in the lower jaw. The tooth-whorl represented all of the teeth produced by that individual in the lower jaw, in that as the individual grew, with the older, smaller teeth being moved into the center of the whorl by the appearance of larger, newer teeth. Comparisons with other eugenodontids suggest that Helicoprion may have grown up to 10-15 ft (3-4 m) long.
The exact location of the tooth-whorl in the lower jaw is an open debate. Older reconstructions placed the whorl in the front of the lower jaw; however this would create drag, making the shark a less efficient swimmer, and turbulence, alerting prey of its approach. A more current and scientifically accepted reconstruction places the whorl deeper into the throat. This arrangement would be best suited for soft bodied prey.
Coloured modern reconstruction illustration [2] by Mary Parrish
Other images currently unsourced
