Hedenstroemiidae [SEP] parent taxon
Hedenstroemiidae
Hedenstroemiidae is an extinct family of cephalopods in the ammonoid order Ceratitida. They were nektonic carnivores.
Genera.
- "Clypites" Waagen 1895
- "Cordillerites" Hyatt and Smith 1905
- "Hedenstroemia" Waagen 1895
- "Mesohedenstroemia" Chao 1959
- "Parahedenstroemia" Spath 1934
- "Pseudohedenstroemia"
- "Pseudosageceras" Diener 1895
- "Tellerites" Mojsisovics 1902
Distribution.
Fossils of species within this family have been found in the Triassic of Afghanistan, Canada,
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