fossil marine animal genera Linnaeus, 1758 - animals Phylum †Hyolitha (Marek, 1963) see Class Hyolitha Marek, 1963 Class †Orthothecimorpha 1 Order †Circothecida Sysoev, 1968 2 Order †Exilithecida Sysoyev, 1968 3 Order †Globorilida Syssoiev, 1957 4 Order †Orthothecida Marek, 1966