A holotype is a single physical example (or illustration) of an
organism, known to have been used when the species (or lower-ranked
taxon) was formally described. It is either the single such physical
example (or illustration) or one of several such, but explicitly
designated as the holotype. Under the International Code of Zoological
Nomenclature (ICZN), a holotype is one of several kinds of
name-bearing types. In the International Code of Nomenclature for
algae, fungi, and plants (ICN) and ICZN the definitions of types are
similar in intent but not identical in terminology or underlying
For example, the holotype for the butterfly
1 Replacements for holotypes 2 See also 3 References 4 External links
Replacements for holotypes Under the ICN, an additional and clarifying type could be designated an epitype under Article 9.8, where the original material is demonstrably ambiguous or insufficient. A conserved type (ICN article 14.3) is sometimes used to correct a problem with a name which has been misapplied; this specimen replaces the original holotype. In the absence of a holotype, another type may be selected, out of a range of different kinds of type, depending on the case, a lectotype or a neotype. For example, in both the ICN and the ICZN a neotype is a type that was later appointed in the absence of the original holotype. Additionally, under the ICZN the Commission is empowered to replace a holotype with a neotype, when the holotype turns out to lack important diagnostic features needed to distinguish the species from its close relatives. For example, the crocodile-like archosaurian reptile Parasuchus hislopi Lydekker, 1885 was described based on a premaxillary rostrum (part of the snout), but this is no longer sufficient to distinguish Parasuchus from its close relatives. This made the name Parasuchus hislopi a nomen dubium. Texan paleontologist Sankar Chatterjee proposed that a new type specimen, a complete skeleton, be designated. The International Commission on Zoological Nomenclature considered the case and agreed to replace the original type specimen with the proposed neotype.
A modern holotype label for
The procedures for the designation of a new type specimen when the original is lost come into play for some recent, high-profile species descriptions in which the specimen designated as the holotype was a living individual that was allowed to remain in the wild (e.g. a new species of capuchin monkey, genus Cebus, Marleyimyia xylocopae, or the Arunachal macaque Macaca munzala). In such a case, there is no actual type specimen available for study, and the possibility exists that—should there be any perceived ambiguity in the identity of the species—subsequent authors can invoke various clauses in the ICZN Code that allow for the designation of a neotype. Article 75.3.7 of the ICZN requires that the designation of a neotype must be accompanied by "a statement that the neotype is, or immediately upon publication has become, the property of a recognized scientific or educational institution, cited by name, that maintains a research collection, with proper facilities for preserving name-bearing types, and that makes them accessible for study", but there is no such requirement for a holotype. See also
Type (biology) Allotype (zoology) Paratype Type species Genetypes- genetic sequence data from type specimens.
^ Case 3165, Bulletin of Zoological Nomenclature 58:1 Archived 2007-09-28 at the Wayback Machine., 30 March 2001. ^ Opinion 2045, Bulletin of Zoological Nomenclature 60:2 Archived 2007-09-28 at the Wayback Machine., 30 June 2003. ^ Mendes Pontes, A.R., Malta A. and Asfora, P.H. 2006. A new species of capuchin monkey, genus Cebus Erxleben (Cebidae, Primates): found at the very brink of extinction in the Pernambuco Endemism Centre. Zootaxa 1200: 1-12. ^ Sinha, A.,Datta, A., Madhusudan, M. D. and Mishra, C. (2004). "The Arunachal macaque Macaca munzala: a new species from western Arunachal Pradesh, northeastern India". International Journal of Primatology volume: 26 issue: 977 pages: 989. ^ International Code of Zoological Nomenclature, Art. 75.3.7
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BOA Photographs of type specimens of Neotro