Pterodactylus? micronyx? TM 13104 (Winkler 1870, No. 34 in the Wellnhoger 1970 catalog) ~3 cm skull length, was considered a juvenile Pterodactylus, but it is unrelated. No. 34 was derived from a sister to Gmu-10157 and phylogenetically preceded another tiny pterosaur, the basal cycnorhamphid, BSP 1968 XV 132 and a larger pterosaur, the basal ornithocheirid, Yixianopterus.
Distinct from Gmu-10157, the skull of No. 34 had a shorter pointed rostrum. The postorbital was lower. The skull and mandible were more gracile with smaller teeth.
The entire vertebral spine was shorter and more gracile.
The sternal complex was anteroposteriorly shorter with distinct lateral processes. The metacarpus was longer, subequal to the ulna. The fingers were smaller. The proximal phalanges were longer.
The ischium was broad and its rims approach both the pubis and ilium. Metatarsal V was shorter. The metatarsals were not appressed.
One centimeter tall hatchlings might not have been volant due to their high surface-to-volume ratios. Instead they may have been restricted to humid leaf litter or risk desiccation (Hedges and Thomas 2001).
See the pterosaur family tree here.