Nyctosaurus sp. UNSM 93000 (Brown 1978, 1986) was derived from a sister to Nyctosaurus gracilis and phylogenetically preceded the crested Nyctosaurus specimens. Except for the rostral tip, the skull and cervicals are missing.

Distinct from Nyctosaurus gracilis, the dorsals of the Nebraska specimen relatively shorter.

The scapula and coracoid were more robust. The deltopectoral crest of the humerus most closely resembled that of Muzquizopteryx. Fingers I-III were tiny vestiges. Manual 4.1 extended to mid ulna when folded. Manual 4.4 was probably fused to m4.3 or it was missing and m4.3 became curved.

The pubis and ischium did not touch, as in more primitive nyctosaurs.

It would have been impossible for the forelimb to develop thrust during terrestrial locomotion. It was likely elevated or used like a ski-pole.

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

Alcione elainus (Longrich, et al. 2018) is based on just a few bones, but enough to indicate another flightless pterosaur, 1.5x larger that the UNSM specimen. Note the short antebrachium and metacarpus. Distal wing elements reduce more quickly in other flightless pterosaurs, forming the basis for this reconstruction. The sternal complex may be too small based on scale bars.

Barbaridactylug grandis (Longrich, et al. 2018) is twice as tall as UNSM 93000 and could also be flightless based on the short antebrachium.