2017年3月29日 · These findings reveal an undocumented diversity in the joint structure of alligators and show that crocodylians and birds build novel, kinetic cranial joints differently. This complicates accurate identification of synovial joints and functional inferences of cranial kinesis in fossil archosaurs and tetrapods in general.

The work presented here provides insight into the relationship between significant shifts in ankle structure and the remarkable locomotor diversity documented throughout archosaur radiation. 3D ankle mobility in this clade appears to originate from the ability to modulate joint contributions across the network of bones and joints—both ...

2021年2月8日 · As a case study, we measured nearly 600,000 poses from the hindlimb joints of the Helmeted Guineafowl and American alligator, which represent an extant phylogenetic bracket for the archosaurian ancestor and its pseudosuchian (crocodilian …

in alligator joints. Second, although both animals’ hip joints remain abducted during locomotion, these poses are biased toward the more adducted side of their ROM envelopes, particularly during the weight-bearing stance phase. Finally, all hinge-like joints studied (knees of both species and guineafowl ankle) are biased toward abduction ...

2021年12月3日 · Future studies of terrestrial locomotion among full-size adult alligators could give further insights into how animals with non-parasagittal limb posture modulate limb joint angles, joint moments and limb force distribution as they increase mass and change in body proportions and inertial properties.

subadult American alligators (total length 0.46–1.27 m, body mass 0.3–5.6 kg) and examined their limb kinematics, forces, joint moments and center of mass (CoM) to test for ontogenetic shifts in

2018年11月20日 · Alligator shoulder girdle anatomy. (A) Lateroventral view of the shoulder girdle and right forelimb of an American alligator (Alligator mississippiensis). (B) Cranio-dorsal view of the dorsal aspect of the coracosternal joint disarticulated to show the tongue (ventral coracoid) and groove (on the antero-lateral aspect of the sternal cartilage).

In this study, we employed manual markerless XROMM (X-ray Reconstruction Of Moving Morphology) to measure detailed 3-D kinematics of the shoulder girdle and forelimb bones of American alligators (Alligator mississippiensis) walking on a treadmill.

2021年12月1日 · Here, we used juvenile to subadult American alligators (total length 0.46-1.27 m, body mass 0.3-5.6 kg) and examined their limb kinematics, forces, joint moments and center of mass (CoM) to test for ontogenetic shifts in posture and limb mechanics. Larger alligators typically walked with a more adducted humerus and femur and a more extended knee.

2005年3月15日 · Alligator hindlimbs show high torsional loads during terrestrial locomotion, in sharp contrast to the bending or axial compressive loads that predominate in animals that use parasagittal limb movements.