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In contrast an oligotypic taxon contains more than one but only a very few subordinate taxa.
Just as the term monotypic is used to describe a taxon including only one subdivision, one can also refer to the contained taxon as monotypic within the higher-level taxon, e.g. a genus monotypic within a family. Some examples of monotypic groups are:
- In the Order Amborellales, there is only one family, Amborellaceae and there is only one genus, Amborella, and in this genus there is only one species, namely Amborella trichopoda
- The family Cephalotaceae includes only one genus, Cephalotus, and only one species, Cephalotus follicularis – the Albany pitcher plant.
- Anodorhynchus hyacinthinus, the hyacinth macaw, is a monotypic species; no subspecies have been distinguished within the species.
- Panurus biarmicus, the bearded reedling, has a few subspecies across its range, but belongs to the genus Panurus, which current knowledge considers monotypic (the only genus) within the family Panuridae.
- Ozichthys albimaculosus, the cream-spotted cardinalfish, found in tropical Australia and southern New Guinea, is the type species of the monotypic genus Ozichthys.
- The flowering plant Breonadia salicina is the only species in the monotypic genus Breonadia.
- The madrone butterfly is the only species in the monotypic genus Eucheira. However, there are two sub-species of this butterfly, E. socialis socialis and E. socialis westwoodi.
- Mayr E, Ashlock PD. (1991). Principles of Systematic Zoology (2nd ed.). McGraw-Hill. ISBN 0-07-041144-1
- McNeill, J.; Barrie, F.R.; Buck, W.R.; Demoulin, V.; Greuter, W.; Hawksworth, D.L.; Herendeen, P.S.; Knapp, S.; Marhold, K.; Prado, J.; Reine, W.F.P.h.V.; Smith, G.F.; Wiersema, J.H.; Turland, N.J. (2012). International Code of Nomenclature for algae, fungi, and plants (Melbourne Code) adopted by the Eighteenth International Botanical Congress Melbourne, Australia, July 2011. Regnum Vegetabile 154. A.R.G. Gantner Verlag KG. ISBN 978-3-87429-425-6. articles 38.5 and 38.6
- Fraser, T. H. (2014). "A new genus of cardinalfish from tropical Australia and southern New Guinea (Percomorpha: Apogonidae)". Zootaxa 3852 (2): 283–293.
- P.G., Kevan,; R.A., Bye, (1991). "natural history, sociobiology, and ethnobiology of Eucheira socialis Westwood (Lepidoptera: Pieridae), a unique and little-known butterfly from Mexico". Entomologist. ISSN 0013-8878.