 I. fittoni was described by Lydekker in 1889 . Like I. dawsoni , this species was described from the Wadhurst Clay of East Sussex . It is now the type species of Hypselospinus . 
 I. fittoni was described by Lydekker in 1889 . Like I. dawsoni , this species was described from the Wadhurst Clay of East Sussex . It <a href='drop_aux' title='1'><mark>is</mark></a>now the type species of Hypselospinus . 
I. fittoni was described by Lydekker in 1889 . Like I. dawsoni , dis species was described from the Wadhurst Clay of East Sussex . It now the type species of Hypselospinus .