Balticoceras [SEP] parent taxon
Balticoceras
Balticoceras is a genus in the Orthocerid family, Orthoceratidae, from the Upper Ordovician of Estonia, closely related to "Michelinoceras". "Balticoceras" is distinguished by its straight shells with a subcircular cross section, broadly flattened ventrally and evenly rounded dorsally, and by its marginal, orthochoanitic siphuncle. "Balticoceras" which is included in the subfamily Michelinoceratinae along with "Michelinoceras" should not be confused with "Baltoceras" which belongs in the Ellesmerocerida.
"References".
- Walter C. Sweet 1964. Nautiloidea- Orthocerida
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