Pterodactylus? kochi? SMNS 81775 was considered a juvenile Pterodactylus antiquus. Here SMNS 81775 was derived from as sister to another tiny pterosaur, SoS 4006 (No. 31), and it phylogenetically preceded two other tiny pterosaurs, Ningchengopterus and B St 1967 I 276 (No. 6 in Wellnhofer (1970).

Distinct from No. 31, the skull of SMNS 81775 was longer and lower. The teeth were smaller and more uniform in size. The postorbital/squamosal bar was below the midpoint of the orbit. The posterior mandible was deeper than the anterior.

The family tree of the Ornithocephalia and Germanodactylia is here. The expanded family tree of the Pterosauria is here.

Ornithocephalus continued the size reduction that originated with Scaphognathus and was at the base of a new clade of pterosaurs, the Ornithocephalia, defined as Pteranodon, Ornithocephalus, their last common ancestor and all of its descendants.

Included within the Ornithocephalia are Pterodactylus, Germanodactylus, the Dsungaripteridae, the Tapejaridae, the Shenozoupteridae and the Pteranodontidae -- plus all the smaller and fewer taxa sprinkled at their bases.

Following a secondary size decrease in SMNS 81775 and No. 6 (in the Wellnhofer 1970 catalog), pterosaurs began a slow growth in size culminating with the giant crested forms, Tupuxuara and Pteranodon.

All shared a very sharp set of jaw tips.

Bennett SC 2006. Juvenile specimens of the pterosaur Germanodactylus cristatus, with a review of the genus. Journal of Vertebrate Paleontology 26:872–878.SMNS

Wellnhofer P 1970. Die Pterodactyloidea (Pterosauria) der Oberjura-Plattenkalke Süddeutschlands. Abhandlungen der Bayerischen Akademie der Wissenschaften, N.F., Munich 141: 1-133.

wiki/Pterodactylus