Complex sentence: Oxynoticeratidae is a family of true ammonites (order Ammonitida) from the Lower Jurassic and part of the superfamily Psilocerataceae, characterized by mostly involute, oxyconic shells with narrow venter and compressed, lanceolate whorl section.
Split into simpler sentences: Oxynoticeratidae is a family of true ammonites (order Ammonitida) from the Lower Jurassic. They are part of the superfamily Psilocerataceae, characterized by mostly involute, oxyconic shells with narrow venter and compressed, lanceolate whorl section.