Temnospondyls and anthracosaurs were later found to be two distantly related groups, and paleontologist Alfred Romer placed Memonomenos within Anthracosauria.
American paleontologist Alfred Romer used the term in a similar sense, grouping most Permian and Triassic temnospondyls under Rhachitomi.
The famous American vertebrate paleontologist Alfred Romer recognized in 1939 that the fossil amphibians described as Leptorophus levis are the larvae of Sclerocephalus.
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This classification was erected by Hans Friedrich Gadow in 1893 and followed by Alfred Romer (1933) and subsequent authors through most of the 20th century.
The fossil, now housed in the Museum of Comparative Zoology at Harvard University, was discovered by American paleontologist Alfred Romer on April 15, 1950 and was first mentioned in the scientific literature by paleontologist Robert L. Carroll in 1964.