Spot the difference!
The identification of ammonites requires a very detailed study of their shape and form. This species, Androgynoceras wrighti, is subtly different from the much more common Androgynoceras lataecosta (also pictured). On A. wrighti there are double tubercles or spines along each rib, whereas the ribbing of A. lataecosta is smooth and even. If you find an ammonite that’s different from others, you could get it named after yourself or a friend!
Find out more about ammonites on the molluscs pages.