Balcoracania [SEP] parent taxon
Balcoracania
Balcoracania dailyi is a small (typically about ) trilobite of the family Emuellidae. Its fossils have been found in south Australia and Antarctica. It can be recognised by a short field between the front of the axis in the head (or glabella) and the border ridge, and a semi-circular headsheald, as compared to touching glabella and border, and the sub-pentagonal head, in the sister-genus "Emuella". Both emuellid genera share eye ridges that are positioned parallel to the frontal and lateral
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