It shares a similar pattern of skull roofing bones with forms such as " Ichthyostega " and " Acanthostega " . " Eusthenopteron ", like other enamel, which characterizes all of the earliest known tetrapods as well.
22.
Since the early 20th century, several families of tetrapodomorph fishes have been proposed as the nearest relatives of tetrapods, among them the rhizodonts ( notably Sauripterus ), the tristichopterids ( notably Eusthenopteron ), and more recently the elpistostegalians ( also known as Panderichthyida ) notably the genus Tiktaalik.
23.
Similar to " Eusthenopteron ", the radials do not articulate with the radius on the distal end . " Acanthostega " also has a 1 : 2 ratio of humerus to radius and ulna, a feature seen in all tetrapods higher than " Acanthostega " on the phylogeny.
24.
However, the only phylogenetic analyses that included " Marsdenichthys " either placed it with " Eusthenopteron " in a clade within a monophyletic Osteolepiformes, a polytomy with " Eusthenopteron " basal to " Megalichthys ", or a polytomy basal to " Medoevia " and " Gogonasus ".
25.
However, the only phylogenetic analyses that included " Marsdenichthys " either placed it with " Eusthenopteron " in a clade within a monophyletic Osteolepiformes, a polytomy with " Eusthenopteron " basal to " Megalichthys ", or a polytomy basal to " Medoevia " and " Gogonasus ".
26.
On Long's 1986 expedition to Gogo the first relatively complete skull of " Gogonasus " was found by Chris Nelson and after being prepared solved a scientific controversy by showing that the inner large fangs of the coronoid bones did not insert into the choana of the palate ( Long 1988 ) as had been suggested by Rosen et al . ( 1981 ) for " Eusthenopteron ".
27.
Like other fish-like sarcopterygians, " Eusthenopteron " possessed a two-part cranium, which hinged at mid-length along an intracranial joint . " Eusthenopteron "'s notoriety comes from the pattern of its fin endoskeleton, which bears a distinct humerus, ulna, and radius ( in the fore-fin ) and femur, tibia, and fibula ( in the pelvic fin ).
28.
Like other fish-like sarcopterygians, " Eusthenopteron " possessed a two-part cranium, which hinged at mid-length along an intracranial joint . " Eusthenopteron "'s notoriety comes from the pattern of its fin endoskeleton, which bears a distinct humerus, ulna, and radius ( in the fore-fin ) and femur, tibia, and fibula ( in the pelvic fin ).
29.
For almost 100 years " Eusthenopteron " had been the well-used role model for demonstrating stages in the evolution of lobe-finned fishes to tetrapods . " Gogonasus " now replaces " Eusthenopteron " in being a better preserved representative without any ambiguity in interpreting its anatomy ( as had been shown for example by Rosen et al . 1981 when erroneously reconstructing the fit of the lower jaws to the palate ).
30.
For almost 100 years " Eusthenopteron " had been the well-used role model for demonstrating stages in the evolution of lobe-finned fishes to tetrapods . " Gogonasus " now replaces " Eusthenopteron " in being a better preserved representative without any ambiguity in interpreting its anatomy ( as had been shown for example by Rosen et al . 1981 when erroneously reconstructing the fit of the lower jaws to the palate ).
