Anhangueridae

Aureliano, Tito, Ghilardi, Aline M., Fernandes, Marcelo A. & Ricardi-Branco, Fresia S., 2024, Air sac attachments or tendon scars: the distinction between soft tissue traces in archosaur bone, Zoological Journal of the Linnean Society 202 (1), pp. 1-8 : 3

Anhangueridae indet.

DGEO-CTG-UFPE 7516, ulna ( Aureliano et al., 2014).

The ulna of a large pterodactyloid pterosaur is nearly complete and only misses the proximal epiphysis. The midshaft cross-section histological profile indicates an adult individual as evidenced by the presence of an External Fundamental System (EFS). There is a broad medullary cavity and foramina were absent. Primary lamellar bone dominates ( Fig. 1 A-F). No Sharpey’s fibres were detected.

Figures

Figure 1. Lamellar bone fibres in an anhanguerid pterosaur ulna (DGEO-CTG-UFPE 7516; A-F) and in a spinosaurine theropod tibia (LPP-PV-0042; G-L). Note that these fibres are only visible at high magnifications (100×; arrowheads). Silhouettes in A and G indicate sampled elements (not to scale; art by Felipe A. Elias). All polarized light. Crossed nicols in A-E and G-L. Parallel nicols in F. Compensator in A-D, G-I and L. The relative angle to the cortical surface is approximately 80° in A, B; 340° in C; 290° in D-F; 120° in G-L.Scale bar in A, H = 250 µm; in B, I = 50 µm; G = 500 µm; in C-F, J-L = 10 µm.