Nyctosaurus bonneri FHSM VP 2148 (Bonner 1964, Miller 1972) Coniacian, Late Cretaceous was derived from a sister to Muzquizopteryx and phylogenetically preceded Nyctosaurus gracilis, the Field Museum specimen.

Overall larger than and distinct from Muzquizopteryx, the skull of Nyctosaurus bonneri was downturned anterior to the antorbital fenestra. No crest was present. The postorbital process of the jugal was gracile. The mandible was nearly as deep as the skull.

The cervicals were shorter and more robust. The sacrum was coosified.

The sternal complex was shorter and wider. The scapula and coracoid were more robust. The deltopectoral crest was greatly enlarged. The metacarpus was elongated. Fingers I-III were vestiges, probably because they could not touch the ground. Compared to Eopteranodon, the wing was longer. The distal wing phalanges were relatively longer.

The pelvis was relatively smaller. The hind limb and foot were relatively shorter.

The increase in wing length and decrease in leg length means this Nyctosaurus probably spent more time flying than Muzquizopteryx.

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