Open AccessThe hyomandibular of Eusthenopteron and the tetrapod middle ear
Author(s) -
T. S. Westoll
Publication year - 1943
Publication title -
proceedings of the royal society of london. series b, biological sciences
Language(s) - English
Resource type - Journals
eISSN - 2053-9193
pISSN - 0080-4649
DOI - 10.1098/rspb.1943.0014
Subject(s) - tetrapod (structure) , stapes , suspect , mathematics , anatomy , biology , middle ear , psychology , statistics , criminology
The hyomandibular ofEusthenopteron was incorrectly described by Sternberg : it compares closely with that ofEctosteorhachis described by Romer. Sternberg ’s account of the oticoccipital part of the cranium is also inaccurate, because his material is badly crushed. His phylogenetic conclusions are therefore suspect. It is considered that Eaton ’s theory of the transformation of the Rhipidistian hyomandibular to the primitive tetrapod ‘stapes’ or columella is essentially correct. The processus opercularis becomes the processus tympanicus (extrastapes or extracolumella).