The rash did not change with temperature or position and was somewhat tender. Livedo reticularis was confirmed by biopsy (see Figure 1). Skin looks mottled, blotchy, and reticulated without ...

A fossil of the blade-like part of the hybodus species was found in Kuji, Iwate Prefecture, according to the announcement by the Kuji Amber Museum on July 16. The hybodus was an ancestor of sharks ...

Hybodus lived about 303.4 million to 66 million years ago and is possibly one of the longest-living prehistoric sharks of all time. It’s definitely the longest-living one on this list!

Hybodus went extinct 65 million years ago. The most common Hybodus fossils are teeth and spines. Ptychodus lived until around ...

The Jurassic shark, Hybodus, had a pair of small horns on its head while another species, Stethacanthus, had a dorsal fin shaped a lot like an iron. Weirdest of all was probably Helicoprion ...