Hey Erose, I'm an Isotelus sp. hunter from the Caesar Creek Lake spillway, and I came across a GIANT hypostome (~5.5 cm at widest width) and I have had trouble figuring out the size of the trilobite which it came from. How did you do it? This hypostome needs a master... and I need your magic! Thanks! (Hahaa, this is my first post :-D)