Pterodactylus  private, unnumbered (Frey and Tischlinger 2000) was derived from a sister to Pterodactylus scolopaciceps (No. 21 in the Wellnhofer 1970 catalog) and phylogenetically preceded Pterodactylus antiquus (No. 4 in the Wellnhofer 1970 catalog). The private specimen was twice as tall as No. 20.

Distinct from No. 21, the skull of the private specimen had an antorbital fenestra half the length of the rostrum. The quadrate did not horizontally oppose the jawline. The postorbital cranium descended in a straight line and ended opposite the broadest part of the orbit.

The cervical series was longer. The sacral series was shorter.

The sternal complex is twice was wider and shorter. The humerus was straight. The ulna/humerus ratio was at least 1.5:1. Manual 4.2 was shorter than m4.1.

The pelvis was smaller. The prepubis embayment was filled in. The tibia was subequal to the glenoid-acetabulum length and more than twice the length of the ilium. The pedal unguals were not deeper than their penultimate phalanges.

Part of a soft cranial crest is preserved with a spiral fiber substructure. Keratinous extensions of the unguals were preserved.

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