 Two species described by Richard Lydekker in the late 19th century have been reassigned to different genera . 
 Two species described by Richard Lydekker in the late 19th century <a href='been_done' title='1'><mark>have</mark></a> been reassigned to different genera . 
2 species described by Richard Lydekker in the late 19th century done been reassigned to different genera .