HAPPY #skullsunday! I'm still processing just how awesome my trips to the Royal Tyrrell Museum & Museum of Osteology were, so I've combined the two! . The top photo is a jaw from a modern bowmouth guitarfish (Rhina ancylostoma) below, is a guitarfish from 75 million years ago! . With 47 flattened upper and 50 lower tooth rows arranged in winding bands, guitarfish can crush and feed on the hard shells of mollusks and crustaceans. . Elasmobranchii, a subclass of cartillaginous fishes such as sharks, rays, skates, and sawfish, have been on the planet for millions of years and have survived many mass extinctions. Hopefully with conservation efforts, they'll be here for millions more. . #sharks #sharkconservation #elasmobranch #conservation #guitarfish #rays #fossil #fossilfriday #protectouroceans #fossilrecord #royaltyrrellmuseum #osteologymuseum #skulls #skullsunlimited #teeth