Ctenorhachis [SEP] parent taxon
Ctenorhachis
Ctenorhachis (Greek for "comb spine") is an extinct genus of the family Sphenacodontidae. "Ctenorhachis" was related to "Dimetrodon", but did not belong to the same subfamily as "Dimetrodon" and "Sphenacodon", being a more basal member of Sphenacodontidae. "Ctenorhachis" lived in the Early Permian epoch. Two specimens are known that have been found from the Wichita Group outcropping in Baylor and Archer counties, north-central Texas. Only the vertebrae and pelvis are known. Articulated vertebrae from
Taxon in disguise
In bacteriology, a taxon in disguise is a species, genus or higher unit of biological classification whose evolutionary history reveals has evolved from another unit of similar or lower rank, making the parent unit paraphyletic. This happens when rapid evolution makes a new species appear radically different from the ancestral group, so that it is not (initially) recognised as belonging to the parent phylogenetic group, leaving the latter an evolutionary grade.
While the term is from bacteriology, parallel examples are found throughout the tree of