There is a 21% VAT added by the Czech government that is in addition to the prices below.

Registration (including on site)
Full, $720 (plus 21% VAT)
Early Career (postdoc), $576* (plus 21% VAT)
Student, $216 (plus 21% VAT)

* received Ph.D. in 2016 or more recently (email if you have a special circumstance like parental leave etc.)

There is a substantial discount for scientists from Low and Low-Middle GDP countries with senior scientists paying the student rate, ECRs paying 80% of student rate, and students paying 20% of student rate.

You will also automatically become a member of the International Society for Vertebrate Morphology, which puts on the congress.