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Dinosaur bones and teeth, shark teeth, and green river formation sedimentary fossils get most of the glory. What are some of the other fossils that deserve more attention?

I have a large collection of extant shark and ray jaws that I use to understand tooth features. However, a number of tooth features, especially tooth root features, are really hard to see in jaws. So I’ve started to purchase (40+ species to date) and photograph individual teeth of a number of extant shark species. I’ll try to post some of the pictures (labial and lingual views) as I take them. This is another post of three extant species that most collectors don’t see. Centroscymnus coelioepis (Portuguese Dogfish Shark) Upper teeth (5 mm, 2 mm, & 4.5 mm): Lower teeth (4 mm, 5 mm & 7 mm): Scymnodon ringens (Knifetooth Dogfish Shark) Upper teeth (both 7 mm): Lower teeth (13 mm, 8 mm & 6 mm): Somniosus rostratus (Little Sleeper Shark) Upper teeth (5 mm, & 3 mm): Lower teeth (7 mm, 7 mm & 3.5 mm): Marco Sr.

I have a large collection of extant shark and ray jaws that I use to understand tooth features. However, a number of tooth features, especially tooth root features, are really hard to see in jaws. So I’ve started to purchase (40+ species to date) and photograph individual teeth of a number of extant shark species. I’ll try to post some of the pictures (labial and lingual views) as I take them. For this post I’ll post three extant species that most collectors don’t see. Glyphis gangeticus (Ganges Shark) Upper teeth (23 mm, 23 mm, & 21 mm): Lower teeth (22 mm & 21 mm): Somniosus microcephalus (Greenland Shark) Upper teeth (12 mm & 11mm): Lower teeth (14mm, 10 mm, & 12 mm): Dalatias licha (Kitefin Shark) Here is a cool lower symphyseal tooth (17 mm): Two other lower teeth (13 mm & 10 mm) Marco Sr.

What are the world's rarest fossils? Post a picture if you can!