Here you go http://www.karlsweb.com/Gallery/GalleryImagePages/Mark/Mark_Scarrans.htm Scarrans have two inch long claws on their fingers. As to feet, only this Scaran was shown with feet exposed Cargn http://www.herpy.net/gallery/data/media/21/Scarranfullform.jpg 4 toes, with the same claws. He just kicked the crap out of a Peacekeeper-seen lying against the wall. PK's are Sebacean-which as you can see look human, but with one exception, unlike humans sebaceans lack the gland to control temprature, so heat kills them. Scarrans love heat. Now you can see where Scorpius comes from.
Some think the Scarrans are too ugly to write something with them in it. I think they look badass. :) The sketch I did above shows the big male Scarran (as in the photo of Cargn) have horse like faces, and the females look more human. Scarrans are bigger than humans, 66 to 7 feet is their average height. Not to mention super strong, as in they can with little problem, hurl a person for some distace or one punch can crush a person's bones.
If a Scarran and a human mated-M/F stype that is, you'd have an offspring like Scorpius,but with no heat problems to bother him.
For more on the Scarrans checkout http://www.farscape-1.com/index.php?title=Scarrans
And on Scorpius http://www.farscape-1.com/index.php?title=Scorpius