ORDER            Haptopodida Pocock 1911 [Fossil; Petrunkevitch 1955 nom. correct.; Carb.]
                 [=Haptopoda Pocock 1911]
FAMILY                      Plesiosironidae Pocock 1911 [Fossil]
GENUS                              Plesiosiro Pocock 1911 [Fossil]
SPECIES                                 Plesiosiro madeleyi Pocock 1911 [Fossil; see Dunlop 1999:44]