Paratype

Paratype
Name	Paratype
Classification	Nomenclatural term
Authority	Nomenclature codes
Subdivision ranks	Usage contexts

Paratype

A paratype is a nomenclatural term used in biological systematics to denote specimens other than the holotype that were cited in the original description of a taxon. It functions alongside other name-bearing concepts to stabilize names published under codes such as the International Code of Zoological Nomenclature and the International Code of Nomenclature for algae, fungi, and plants, and is integral to practices followed by institutions such as the Natural History Museum, London, the Smithsonian Institution, and the Royal Botanic Gardens, Kew.

Definition and nomenclature

In formal designation practice a paratype is any specimen cited in the protologue that is neither the holotype nor a syntype or lectotype; paratypes serve as supporting exemplars for the original concept published by authors such as Carl Linnaeus, Charles Darwin, Carolus Clusius, and modern taxonomists at museums like the American Museum of Natural History and the Muséum national d'Histoire naturelle. Under the International Code of Zoological Nomenclature a paratype has specific status that differs from that under the International Code of Nomenclature for algae, fungi, and plants where terms like isotype and syntype also apply, and where institutions such as the Royal Botanic Gardens, Kew and the Jodrell Laboratory curate types.

History and development

The concept evolved from early typification efforts by figures including Gottlieb Haberlandt and codification movements culminating in the International Botanical Congress and the International Zoological Congress. Debates at congresses in cities like Stockholm and Vienna shaped modern rules; landmark publications by the International Commission on Zoological Nomenclature and the International Association for Plant Taxonomy formalized paratype usage. Naturalists working at institutions such as the Muséum national d'Histoire naturelle and the Smithsonian Institution contributed specimen series that illustrated the need for secondary name-bearing specimens beyond the holotype.

Role in taxonomy and type designation

Paratypes support diagnostic characters reported by describers such as Alfred Russel Wallace and Ernst Mayr and are consulted in revisions by taxonomists affiliated with the Linnean Society of London and the German Entomological Institute. They are not name-bearing in the same sense as the holotype under the International Code of Zoological Nomenclature but they provide critical morphological, molecular, and geographic context—used by researchers at the Scripps Institution of Oceanography, the Field Museum, and the Royal Ontario Museum when reassessing species limits.

Criteria and selection process

Authors designating paratypes follow criteria outlined by bodies such as the International Commission on Zoological Nomenclature and the International Association for Plant Taxonomy; criteria include provenance documentation, consistent association with the holotype, and inclusion in the protologue published in journals like Nature, Systematic Biology, and the Journal of Paleontology. Museums and herbaria—examples include the Herbarium of Harvard University, the Natural History Museum, London, and the California Academy of Sciences—maintain catalog numbers and accession records to ensure paratype traceability. Taxonomists including David L. Hull and Stephen Jay Gould have emphasized the importance of clear designation to avoid ambiguity addressed in rulings by the International Court of Justice-style panels within nomenclatural commissions.

Usage across taxonomic codes

Different codes treat paratypes differently: the International Code of Zoological Nomenclature explicitly defines paratypes and their limitations, whereas the International Code of Nomenclature for algae, fungi, and plants uses related concepts such as isotypes and paratypes with variant implications for nomenclatural acts cited in outlets like the International Journal of Systematic and Evolutionary Microbiology. For fossils, practitioners publishing in venues like the Journal of Paleontology follow the International Code of Zoological Nomenclature with community norms developed by organizations including the Paleontological Society and the Society of Vertebrate Paleontology.

Examples and case studies

Classic examples involve taxa described by historical figures: paratypes from the collections of Joseph Banks supported many names later revised by Augustin Pyramus de Candolle and modern revisions by researchers at the National Museum of Natural History, France. Case studies in entomology published in the Bulletin of the British Museum (Natural History) illustrate how paratypes from collectors like Alphonse Milne-Edwards informed species boundaries, while molluscan studies by researchers at the Smithsonian Institution show how paratypes provide morphological variation essential for monographic work.

Controversies and nomenclatural implications

Controversies arise when paratypes are lost, mislabelled, or later shown to belong to multiple taxa—situations addressed in decisions by the International Commission on Zoological Nomenclature and debated at meetings of the International Botanical Congress and the International Congress of Entomology. High-profile disputes involving collections at the Natural History Museum, London and repatriation issues raised by governments like those of Australia and Brazil have highlighted ethical and legal dimensions of paratype custody. The increasing use of molecular data by groups such as those at the Broad Institute and the European Molecular Biology Laboratory has prompted proposals to augment paratype practices with sequence-based vouchers and digital repositories like the Global Biodiversity Information Facility.

Category:Nomenclature