A conserved name or nomen conservandum (plural nomina conservanda) is a scientific name that enjoys special nomenclatural protection. Nomen conservandum (pl. nomina conservanda) is a Latin term, meaning a "name which should be conserved". The terms are often used interchangeably, such as by the International Code of Botanical Nomenclature[1], while the International Code of Zoological Nomenclature favours "conserved name". The process for conserving botanical names is different from that for zoological names. Latin is an ancient Indo-European language originally spoken in Latium, the region immediately surrounding Rome. ... The International Code of Botanical Nomenclature (ICBN) is the set of rules that governs plant nomenclature, i. ... The International Code of Zoological Nomenclature (ICZN) is a set of rules in zoology that have one fundamental aim: to provide the maximum universality and continuity in classifying all animals according to taxonomic judgment. ...

Botany

A nomen conservandum, although the term is not explicitly defined within the International Code of Botanical Nomenclature (ICBN), is "...any name of a genus, family, or taxon of intermediate rank that must be adopted in accordance with special legislation (Arts. 14, 15) as a correct name although otherwise contrary to the rules" (McVaugh et al., 1968). The principle of conservation has since been extended to specific names as well. The International Code of Botanical Nomenclature (ICBN) is the set of rules that governs plant nomenclature, i. ...

In botanical nomenclature, conservation is a nomenclatural procedure governed by Art. 14 of the ICBN. Its purpose is The International Code of Botanical Nomenclature is the set of rules according to which plants are given their formal botanical names (scientific names). ...

"to avoid disadvantageous nomenclatural changes entailed by the strict application of the rules, and especially of the principle of priority [...]" (Art. 14.1).

Conservation is possible only for names at the rank of family, genus or species. Besides conservation of a name (Art. 14) the ICBN also offers the option of rejection of a name (Art. 56). Rejection is possible for a name at any rank. In biological classification, family (Latin: familia, plural familiae) is 1) a rank or 2) a taxon in that rank. ... In biology, a genus (plural genera) is a taxonomic grouping. ... In biology, a species is one of the basic units of biodiversity. ...

Conservation may be restricted to the spelling of a name: Euonymus (not Evonymus), Guaiacum (not Guajacum), Hieronyma (not Hyeronima or Hieronima), etc (see orthographical variant). Conservation may also concern the type of a name, thus fixing the application of that name to a taxon. Species Euonymus alatus - Winged Spindle Euonymus americanus - Strawberry-bush Spindle Euonymus atropurpureus - Eastern Burning-bush Euonymus europaeus - European Spindle Euonymus fortunei - Fortunes Spindle Euonymus japonicus - Japanese Spindle Euonymus obovatus - Euonymus occidentalis - Western Burning-bush The spindles, genus Euonymus, comprise about 170-180 species of deciduous and evergreen shrubs and... Species Six species, including: Guaiacum officinale Guaiacum sanctum Guaiacum is a small genus of six species of shrubs and trees in the family Zygophyllaceae, native to subtropical and tropical regions of the Americas. ... Species Hieronyma alchorneoides Hieronyma colombiana etc. ... In botanical nomenclature, an orthographical variant is a variant spelling of the same name. ... In botanical nomenclature, a type (typus, nomenclatural type) is that element to which the name of a taxon is permanently attached . ... A taxon (plural taxa), or taxonomic unit, is a grouping of organisms (named or unnamed). ...

Procedure

1. The procedure starts by submitting a proposal to the journal Taxon (published by the IAPT). This proposal should present the case both for and against conservation of a name. Publication notifies anybody concerned that the matter is being considered and makes it possible for those interested to write in. Publication is the start of the formal procedure: it counts as referring the matter "to the appropriate Committee for study" and Rec14A.1 comes into effect. The name in question is (somewhat) protected by this Recommendation ("... authors should follow existing usage as far as possible ...").
2. After reviewing the matter, judging the merits of the case, "the appropriate Committee" makes a decision either against ("not recommended") or in favor ("recommended"). Then the matter is passed to the General Committee.
3. After reviewing the matter, mostly from a procedural angle, the General Committee makes a decision, either against ("not recommended") or in favor ("recommended"). At this point Art 14.14 comes into effect. Art 14.14 authorizes all users to indeed use that name. If this should be relevant the name can be printed in the relevant Appendix, but only if accompanied by an asterisk to indicate that although it is printed in the physical book which carries the title International Code of Botanical Nomenclature it is not de jure part of the Code.
4. The General Committee reports to the Nomenclature Section of the International Botanical Congress, stating which names (including types and spellings) it recommends for conservation. Then, by Div.III.1, the Nomenclature Section makes a decision on which names (including types, spellings) are accepted into the Code. At this stage the de facto decision is made to modify the Code.
5. The Plenary Session of that same International Botanical Congress receives the "resolution moved by the Nomenclature Section of that Congress" and makes a de jure decision to modify the Code. By long tradition this step is ceremonial in nature only.

In the course of time there have been different standards for the majority required for a decision. However, for decades the Nomenclature Section has required a 60% majority for an inclusion in the Code, and the Committees have followed this example, in 1996 adopting a 60% majority for a decision. The International Association for Plant Taxonomy (IAPT) is devoted to plant systematics, taxonomy and nomenclature. ... International Botanical Congress (IBC) is a large-scale meeting of botanists in all scientific fields, from all over the world. ...

Zoology

For zoology, the term "conserved name", rather than nomen conservandum, is used in the International Code of Zoological Nomenclature, although informally both terms are used interchangably. The International Code of Zoological Nomenclature (ICZN) is a set of rules in zoology that have one fundamental aim: to provide the maximum universality and continuity in classifying all animals according to taxonomic judgment. ...

In the glossary of the International Code of Zoological Nomenclature (the Code for names of animals, one of several Nomenclature Codes), this definition is given: Nomenclature Codes, the Codes governing biological nomenclature: the ICBN, ICZN, ICNB, etc. ...

conserved name

A name otherwise unavailable or invalid that the Commission, by the use of its plenary power, has enabled to be used as a valid name by removal of the known obstacles to such use.

This is a more generalized definition than the one for nomen protectum, which is specifically a conserved name that is either a junior synonym or homonym, and would therefore ordinarily be considered invalid. In zoological nomenclature, synonyms are different scientific names that pertain to the same taxon, for example two names for the same species. ...

An example of a conserved name, one that is also a nomen protectum, is the dinosaur genus name Tyrannosaurus, which was formally described in 1912. Later, Manospondylus (which was formally described in 1892) was found to be the same genus as Tyrannosaurus (a synonym). By the usual rules, the genus Manospondylus has precedence and would normally be the correct name. But the International Commission on Zoological Nomenclature (ICZN) ruled that the name Tyrannosaurus was to be given precedence and treated as the valid name, because it was so well known, and the older name was not in common use (see nomen oblitum). Orders & Suborders Saurischia Sauropodomorpha Theropoda Ornithischia Thyreophora Ornithopoda Marginocephalia Dinosaurs were vertebrate animals that dominated the terrestrial ecosystem for over 160 million years, first appearing approximately 230 million years ago. ... In biology, a genus (plural genera) is a taxonomic grouping. ... Binomial name Tyrannosaurus rex Osborn, 1905 Synonyms Manospondylus gigas Dynamosaurus imperiosus Dinotyrannus megagracilis Nanotyrannus lancensis? Tyrannosaurus (IPA pronunciation or ; meaning tyrant lizard) is a genus of tyrannosaurid theropod dinosaur. ... The International Code of Zoological Nomenclature is a set of rules in zoology that have one fundamental aim: to provide the maximum universality and continuity in classifying all animals according to taxonomic judgment. ... A nomen oblitum (Latin for forgotten name) is a name that has not been used in the scientific community for more than fifty years after its original proposal. ...

The ICZN's procedural details are different from those in botany, but the basic operating principle is the same, with petitions submitted for review by the Commission. The International Code of Zoological Nomenclature is a set of rules in zoology that have one fundamental aim: to provide the maximum universality and continuity in classifying all animals according to taxonomic judgment. ...

Reference

• McVaugh, R., R. Ross and F. A. Stafleu. 1968. An annotated glossary of botanical nomenclature. Utrecht, Netherlands: International Bureau for Plant Taxonomy and Nomenclature of the International Association for Plant Taxonomy.