have an elliptical and taller than wide torso in cross section. That gives them a relatively narrow torso.
A few pterosaurs, especially among the anurognathids, have a wider that tall torso. Previously unrecognized, its time to take a look at these ‘tubby’ pterosaurs.
Wider than tall torso – basal fenestrasaurs
Cosesaurus and Longisquama both have a typical torso, but Sharovipteryx has a wide, circular (in dorsal view), flat torso that contributed to its gliding abilities. Click the link to see it.
Wider than tall torso – pterosaurs
Some, but not all anurognathid pterosaurs trend toward a wider than tall torso. Dendrorhynchoides (Fig. 1) has a very wide sternal complex and robust ribs. Jeholopterus (Fig. 2) likewise has wide ribs and elongate gastralia. The flathead pterosaur (SMNS 81928, Fig. 3) also has a wider than deep torso.
the flightless pterosaur (Sos 2428) and its tiny phylogenetic predecessor, BSPG 1911 I 31 (no. 42 in the Wellnhofer 1970 catalog), both have extended gastralia and ribs that widen the torso.
Even though these pterosaurs have a wide torso, the hind limbs do not bang up against their wider bellies. The elbows could not have been tucked in as tightly as in narrower pterosaurs, but that probably did not pose a problem with obliquely deployed elbows. The knees would have tucked in below the gastralia that supported the belly in erect anurognathids or the knees would have splayed in those pterosaurs with less than a fully erect femur, as determined by the angle of the femoral head to the shaft, discussed earlier.