Career
Professor at the Charles University and later became director of the National Museum in Prague. He also became known for finding fossils once attributed to dinosaurs - Albisaurus albinus and Ponerosteus exogyrarum and so far the only pterosaur known from the Czechoslovakian Republic, Cretornis hlavatschi. The pterosaur was small with a wingspan of about 1.5 m and lived in the Turonian.
The first true dinosaur known from the Czechoslovakian Republic was discovered 90 years after Fritsch"s death (in 2003).
lieutenant is a small ornithopod of Cenomanian age.