Do Waldsteinia and Obregonia contain the same number of species?
Obregonia Obregonia, the artichoke cactus, is a genus of cacti with a single species, Obregonia denegrii. The species is endemic to the state of Tamaulipas in Mexico.
Antigonia (fish) Antigonia is a genus of boarfishes, the largest genus in its family. These are deep-water species, generally found at depths below 50 m . Various extinct species were once placed within "Antigonia", but have since been removed to "Eoantigonia" and "Proantigonia"