Kayoceras [SEP] parent taxon
Kayoceras
Kayoceras is a genus of middle Silurian nautiloid cephalopods, known from Iowa and Illinois, belonging to the Discosoridae. Related genera include "Discosorus", "Endodiscosorus", and "Stokesoceras". "Kayoceras" has a short, breviconic shell, like "Discosorus", but with a more central siphuncle. Derivation is probably from "Discosorus", through an evolutionary shifting of the siphuncle position, which has its origin in the Lowoceratidae, possibly through "Tuyloceras".
References.
- Curt Teichert,
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