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The humerus and femur of Acanthostega contain evidence of greater development of the appendicular muscles compared to more aquatic tetrapods. [3] Acanthostega has a total lack of dermal fin rays and displays the presence of two or more spool-shaped bones or cartilages articulating individually in antero-posterial sets on the distal end of its ...
It accommodates the head of the femur, forming the hip joint. Most tetrapods show a closed acetabulum, in which the socket is completely filled with bone, forming a depression. Dinosaurs are unique in showing a perforate or open acetabulum, where the full extent of the socket is a hole without infilling bone. [1] acromion
A tetrapod is a form of wave-dissipating concrete block used to prevent erosion caused by weather and longshore drift, primarily to enforce coastal structures such as seawalls and breakwaters. Tetrapods are made of concrete , and use a tetrahedral shape to dissipate the force of incoming waves by allowing water to flow around rather than ...
A small projection of bone is present on the acetabulum, a depression in the pelvis that attaches with the end of the femur. This projection is also seen in the Late Devonian tetrapod Ichthyostega . The femur of Antlerpeton is much more robust than that of Ichthyostega , and has prominent ridges like the fourth trochanter that are attachment ...
Here is the most recent introduction to Femur on Wikipedia: "The femur (/ˈfiːmər/; PL femurs or femora /ˈfɛmərə/),[1][2] or thigh bone, is the proximal bone of the hindlimb in tetrapod vertebrates. The head of the femur articulates with the acetabulum in the pelvic bone forming the hip joint, while the distal part of the femur ...
Limbs are attached to the torso via girdles, either the pectoral girdle for the forelimbs, or the pelvic girdle for the hindlimbs.In terrestrial tetrapods, the pectoral girdles are more mobile, floating over the rib cage connected only via the clavicles (to the sternum) and numerous muscles; while the pelvic girdles are typically fused together anteriorly via a fibrocartilaginous joint and ...
A small Ossinodus femur recovered, postulated to belong to a juvenile and compared to the Horton Bluff femur, suggests younger specimens were more aquatic than older specimens. [11] In addition to the fractured radius, the enclosed sensory canal synapomorphy is also indicative of tetrapods moving away from aquatic perceptions. These events are ...
Limnoscelis (/limˈnäsələ̇s/, meaning "marsh footed") was a genus of large diadectomorph tetrapods from the Late Carboniferous to early Permian of western North America. It includes two species: the type species Limnoscelis paludis from New Mexico, [1] and Limnoscelis dynatis from Colorado, [2] both of which are thought to have lived concurrently. [3]