Nomenclature Codes
After the successful introduction of two-part names for species by Linnaeus it became ever more apparent that a detailed body of rules was necessary to govern scientific names. From the mid-nineteenth century onwards there were several initiatives to arrive at worldwide-accepted sets of rules. In the course of time these became the present Nomenclature Codes governing the naming of:
- animals (International Commission on Zoological Nomenclature abbrev. ICZN)
- plants (incl. Fungi, cyanobacteria) (ICN for Plant, Fungi & Algae, ICBN, ICNCP & with supplementary Codes)
- bacteria (International Code of Nomenclature of Bacteria abbrev. ICNB)
- viruses
Differences between Codes
Starting point
The starting point, that is the time from which these Codes are in effect (usually retroactively), varies from group to group, and sometimes from rank to rank. In botany the starting point will often be 1753, in zoology 1758. On the other hand bacteriology started anew, making a clean sweep in 1980, although maintaining the original authors and dates of publication.Workings
There are also differences in the way Codes work. For example, the ICBN (the plant Code) forbids tautonyms, while the ICZN, (the animal Code) allows them.Terminology
These Codes differ in terminology, and there is a long-term project to "harmonize" this. For instance, the ICBN uses "valid" in "valid publication of a name" (= the act of publishing a formal name), with "establishing a name" as the ICZN equivalent. The ICZN uses "valid" in "valid name" (="correct name"), with "correct name" as the ICBN equivalent. Harmonization is making very limited progress.Types
The codes differ in terms of what kinds of types are permissible. The bacteriological code generally requires living type cultures. The botanical code requires dried specimens (typically in an herbarium), or sometimes drawings. There has been ongoing debate regarding which kind of type is more useful in a case like cyanobacteria. The zoological code generally requires a dead preserved animal, but sometimes allows a living type.Other codes
A more radical approach is to replace all existing Codes by a BioCode, basically a synthesis of the existing Codes. The BioCode draft has received little attention since 1997; its originally planned implementation date of January 1, 2000, has passed unnoticed. However, a 2004 paper concerning the cyanobacteria does advocate a future adoption of a BioCode and interim steps consisting of reducing the differences between the codes.Another code in development is the PhyloCode, which regulates phylogenetic nomenclature rather than Linnaean nomenclature (that is, it requires phylogenetic definitions for every name, and does not contain mandatory ranks). Implementation is tentatively scheduled for sometime before 2010.
The formal names of cultivated plants are governed by the ICNCP. This code operates within the limits set by the ICBN, but uses different basic principles.
Something about Phytosociological nomenclature codes with Biological nomencalture codes
Similar problems were encountered in botanical and zoological idiotaxonomy and were rationalized through the establishment of nomenclatural rules specified in the International Codes for Botanical and Zoological Nomenclature. The Phytosociological Nomenclature Commission was, from the very beginning, unanimously in favour of the priority principle (Principle IV), not because it is the basis of the nomenclature of plants and animals, but because it is the sole objective principle and hence the only one to be adopted by all phytosociologists.
While the association was chosen as the basic rank in the system of syntaxa (Principle VI), this did not imply that it was considered to be the fundamental unit. While in earlier times associations were considered to be the smallest units characterized by more or less faithful species, many associations were defined subsequently by differential species so that the fundamental differ- ence between association and subassociation could hardly be sustained.
Some criticize the rules for syntaxonomic names, suggesting that these follow the rules for idiotaxonomic names too closely, arguing that associations cannot be directly compared with species, and vegetation releves cannot be compared with plant specimens. The Nomenclature Commission has always been fully aware that vegetation classification is not directly comparable with the taxonomy of species. Nomenclature is not a science, however, it is a practical device and as such has much in common with the nomenclature of taxa. Many of the rules deal merely with the matter of names themselves without paying particular attention to the contents of such names. Questions concerning effective and valid publication of names, superfluous names, homonyms, priority of names and other subjects are exactly the same as those affecting idiotaxonomic names. Since idio- taxonomic nomenclature codes have a much longer history, it seems only sensible to profit from the experi- ence gained in taxonomy, insofar as such experience can help in the solution of analogous problems in syntaxonomic nomenclature.
In modern taxonomy, species are not based on an individual, but on populations. Nevertheless, one sin- gle plant or animal suffices for a valid description of a new species or infraspecific taxon. The method of nomenclatural type specimens is the common basis for the nomenclature of botanical and zoological taxa. A nomenclatural type ('name-bearing type'), usually con- sists of a permanently preserved specimen of one sin- gle plant or animal (or a representative part of it, e.g. a tree branch with its leaves and/or flowers). If there were more specimens, it would remain arbitrary, as to which of these provides, in sensu strictissimo, the objective standard of reference by which the applica- tion of the name it bears is permanently settled.
Authors, when choosing type-releves, will generally tend to select the most typical and complete releve provided in their original diagnosis. The new Art. 16 moves in that direction and requires that (a) the type- releve of an association must contain its name-giving taxon (taxa), and (b) the type releve of a subassociation must contain the name-giving taxon of the subassociation. For associations and subassociations published before 1.1.1979, a synoptic table is allowed as a sufficient origi- nal diagnosis, although the homotoneity of such syntaxa cannot be effectively assessed. This course of action was adopted to avoid a situation where too many old names would become invalid - the Nomenclature Commission was opposed to the widespread alteration of names.
The use of geographical epithets for syntaxonomic names (if they do not belong to a name-giving taxon) is explicitly forbidden, since these contain no floristic information. Such names are better reserved for geo- graphical races/vicariants, if one wants to use that con- cept. The formation of names for geographical races/ vicariants, variants and subvariants and for the highest units, the division and class group, is completely free, since the Code does not deal with syntaxa of these ranks. Experience with the rules may determine whether or not such units should one day be included in the Code.
Thus, the 'association names' of the Uppsala School, published before 1.1.1936, with the exception of names of moss and lichen communities, are no longer subject of this Code. They correspond in reality to the 'sociations' of that School and are therefore not identical with the associations of the hierarchical system of syntaxa gov- erned by this Code (Principle II). Some of these 'asso- ciation names', however, which were applied for a long period of time in accordance with the nomenclatural type, may be proposed as nomina conservanda and, after positive decision, will become valid (Principle II, Art. 52).
The International Code of Phytosociological No- menclature (ICPN) is one of several Codes that deal with the rules for names used in Biology. The other Codes include the International Code of Botanical No- menclature (ICBN), International Code of Nomenclature for Cultivated Plants (ICNCP), International Code of Zoological Nomenclature (ICZN), International Code of the Nomenclature of Bacteria (IBC) and International Code of Virus Classification and Nomenclature (ICV). The ICBN, ICZN and IBC will possibly be governed in future by a general 'BioCode', ruled by IUBS, the International Union of Biological Sciences, which is the premier organization in Biological Sciences, represent- ing the Academies of Sciences from many countries all over the world.
References in Nomenclature codes
- Ahoren Oren (2004). "A proposal for further integration of the cyanobacteria under the Bacteriological Code". Int. J. Syst. Evol. Microbiol. 54: 1895–1902.- International Code of Zoological Nomenclature, Fourth Edition (1999), article 72.5
- John McNeill (1996-11-04). "The BioCode: Integrated biological nomenclature for the 21st century?". Proceedings of a Mini-Symposium on Biological Nomenclature in the 21st Century.