Pterodactylus? kochi? (von Huene 1951, Senckenberg-Museum Frankfurt a. M. No. 4072, No. 12 of Wellnhofer 1970) was three times as tall and derived from a sister to No. 6 and phylogenetically preceded the several times larger No. 23.
Distinct from No. 6, the skull of No. 12 was relatively longer and sharper. The antorbital fenestra was only half the rostral length. The teeth were larger. The lacrimal was enlarged. The quadrate angle was elevated. The postorbital was raised.
The cervicals were elongated. The caudals were robust.
The scapula was curved. The ventral coracoid was expanded. The humerus was relatively shorter. The ulna was twice as long as the humerus.
The ischium was perforated. The metatarsus was appressed. Pedal 4.4 was shorter.
The family tree of the Ornithocephalia and Germanodactylia is here. The expanded family tree of the Pterosauria is here. Other size comparisons can be found here.