Middle Jurassic cartilaginous fish

thumb|left|Life reconstruction of Protospinax annectans Protospinax is an extinct genus of cartilaginous fish from the Middle to Late Jurassic of Europe and Russia. The type species, P. annectans, was found in the Solnhofen limestones of southern Bavaria. Formerly known from only two specimens, further museum specimens of P. annectans were discovered at the Museum of Comparative Zoology of Harvard University in the 1990s, having been misidentified as Squatina and Heterodontus. Six more species, all known only from isolated teeth, have been assigned to Protospinax, though only four including th