Synthetodus

I don't think I've seen one of those before. That's cool, weird one.

I'm pretty sure this is Gluteus minimus (no joke) described in the paper "Fossils of Uncertain Affinity from the Upper Devonian of Iowa" Davis and Semken Jan. 1975 Science. I collected this site 20 years ago and managed to find several of these along with dozens (hundreds?) of micro shark teeth from a layer that is less than 2 inches thick. All the shark teeth were damaged due to compaction of the sediment.

Interesting. After a google search, it seems you may be correct. Do you (or anybody) have access to that paper? A quick check on the paleobiology database shows no result for Gluteus. I have a few micro teeth as well, but too small for me to photograph.

Interesting. After a google search, it seems you may be correct. Do you (or anybody) have access to that paper? A quick check on the paleobiology database shows no result for Gluteus. I have a few micro teeth as well, but too small for me to photograph.

Try this link. Click on the title and it should lead you to a pdf. If not, let me know and I'll send you a pdf.
http://topics.cs.pri...75/1739069.html

I just picked up around 100 of these in Iowa. They are odd little things.