Phylogeny
Earlier assigned to crocodilian groups, Streptospondylus was in the 20th century typically classified in the Megalosauridae.
Recent analyses indicate that Streptospondylus is a tetanuran theropod. Allain in 2001 suggested that it was closely related to Eustreptospondylus in the Spinosauroidea. Roger Benson in 2008 and 2010 concluded that whether it is a megalosauroid, allosauroid, or a more primitive form cannot be determined because of its extremely fragmentary remains. Later cladistic analysis by Benson and colleagues from 2010 indicated that Streptospondylus was the sister species of Magnosaurus within the Megalosauridae.
Read more about this topic: Streptospondylus