I was reading a paper Fruitbat just posted in his fantastic PDF library, on sauropods see below, and it triggered a concern that I've had for a while for collectors purchasing claws. First let me preface the discussion by saying I'm not a sauropod expert just throwing out some observations and questions. Identifying claws is not an easy diagnosis.
Sellers typically put a name, mostly at a genus level, on claws they sell. I have several in my collection and boy they are indeed